Dr. Richmond U Ideozu is an academic involved in teaching and research in geosciences.Area of expertise include the following Petroleum Geology, Petroleum Geochemistry, Exploration Geophysics, Biostratigraphy, Sedimentology and reservoir geology, Structural geology. Supervised more than 50 undergraduates, more than 50 postgraduate studies including postgraduate diploma, MSc and PhD candidates.
The work of the paper focused on the post impact of oil spill contamination of groundwater in Bas... more The work of the paper focused on the post impact of oil spill contamination of groundwater in Bassambiri Nembe Bayelsa State. Groundwater samples were sampled from hand dug wells from eight stations including the control point for physico-chemical investigation using sterilized glass bottles. Sampling was carried out upstream and downstream on the Santa Barbara River across the stations and the results are as follows surface water pH ranged 6.90-7.50, electrical conductivity 19739.41 µS/cm-28920.64 µS/cm and Chloride 6019.63-9274.82 mg/l. The Total Dissolved Solids (TDS) varied from 10472.72 mg/l-16538.19 mg/l dissolved oxygen (DO) 6.21 mg/l-7.371 mg/l while the mean biochemical oxygen demand (BOD) 0.09 ± 0.52 mg/l-2.4 ± 0.81 mg/l, temperature 28.04˚C-31.79˚C while total alkalinity is 43.95 mg/L-73.87 mg/L. Calcium ion ranged 375.68 mg/l-536.72 mg/l, Magnesium ion 88.35-243.24 mg/l and Potassium ion 41.27-121.17 mg/l. The results of the study showed that the pH, salinity, alkalinity, total suspended solids (TSS), Chlorides, Phosphates, and Nitrates are within permissible limits of the WHO, however the electrical conductivity, TDS, turbidity, DO, BOD, and hardness exceeded WHO permissible limits for drinking water. Total Petroleum Hydrocarbon (TPH) and Heavy metals had low concentrations in the Santa Barbara River across the study area suggesting that surface water is not polluted. However, the surfactants used initially to contain the oil pollution were effective based on this research.
The work of the paper focused on the post impact of oil spill contamination of groundwater in Bas... more The work of the paper focused on the post impact of oil spill contamination of groundwater in Bassambiri Nembe Bayelsa State. Groundwater samples were sampled from hand dug wells from eight stations including the control point for physico-chemical investigation using sterilized glass bottles. Sampling was carried out upstream and downstream on the Santa Barbara River across the stations and the results are as follows surface water pH ranged 6.90-7.50, electrical conductivity 19739.41 µS/cm-28920.64 µS/cm and Chloride 6019.63-9274.82 mg/l. The Total Dissolved Solids (TDS) varied from 10472.72 mg/l-16538.19 mg/l dissolved oxygen (DO) 6.21 mg/l-7.371 mg/l while the mean biochemical oxygen demand (BOD) 0.09 ± 0.52 mg/l-2.4 ± 0.81 mg/l, temperature 28.04˚C-31.79˚C while total alkalinity is 43.95 mg/L-73.87 mg/L. Calcium ion ranged 375.68 mg/l-536.72 mg/l, Magnesium ion 88.35-243.24 mg/l and Potassium ion 41.27-121.17 mg/l. The results of the study showed that the pH, salinity, alkalinity, total suspended solids (TSS), Chlorides, Phosphates, and Nitrates are within permissible limits of the WHO, however the electrical conductivity, TDS, turbidity, DO, BOD, and hardness exceeded WHO permissible limits for drinking water. Total Petroleum Hydrocarbon (TPH) and Heavy metals had low concentrations in the Santa Barbara River across the study area suggesting that surface water is not polluted. However, the surfactants used initially to contain the oil pollution were effective based on this research.
The knowledge of pore pressure plays an essential role in the drilling, planning, and production ... more The knowledge of pore pressure plays an essential role in the drilling, planning, and production operations in the oil and gas industry. The aim of this research is to estimate pore pressure from well log data of the Unag Field situated Offshore in the Niger Delta Nigeria. The overpressured layers were categorised into three overpressure zones (A, B and C) using velocity and effective stress methods, respectively. The identified overpressure zones vary in thickness across the wells. Results reveal that overpressures were generated by disequilibrium compaction and pore pressures. The results further show that undercompaction (loading) mechanism of overpressure, which is characterised by gradual, and increasing slight overpressure with depth, may be the main cause of overpressure especially in zones A and B across the three wells. The research compares the Eaton's and Bower's pore pressure prediction methods. The Bower's method predicted pore pressure values better than the Eaton's method, which is in close agreement with the actual RFT data for three different zones in the studied wells. Hence, the Bower's method is proposed as useful and a better method for predicting pore pressures in other fields in the Niger Delta Basin using well logs.
International Journal of Research and Innovation in Applied Science (IJRIAS), 2021
Abstract: In this study, reservoir sands from seven wells Kanga
Oil field in the Onshore Niger De... more Abstract: In this study, reservoir sands from seven wells Kanga Oil field in the Onshore Niger Delta were analyzed sedimentologically to determine the level of spatial distribution of significant heterogeneity in the subsurface and infer the depositional environments. From the sedimentological analyses, three reservoir intervals J100, K100 and L100 of interest were identified based on the gross thickness of the reservoir sand, cleanliness of the reservoir sand and presence of hydrocarbon, and correlated across the field using suites of wire line logs. The environment of deposition was interpreted using gamma-ray log motif and lithologic description from Sidewall samples. The environments of deposition have been interpreted as Channel sands, Upper Shoreface, Lower Shoreface and Marine Shale, a reflection that the sediments was deposited in medium to low energy environment which favors the deposition of fine to medium grains sediments Key words: sedimentology, depositional environment, reservoir, lithologic and hydrocarbon
International Journal of Agriculture and Environmental Research
Plankton are the main varied group of aquatic organisms that play major roles in the aquatic envi... more Plankton are the main varied group of aquatic organisms that play major roles in the aquatic environment as primary producers. The study focused on the effect of crude oil Spill on Plankton composition in Santa Barbara River, Nembe, Bayelsa State. Samples were collected and preserved in 5% formalin from ten (10) water sampling locations with one serving as control in four replicates. Standard plankton net of 55m mesh size was used for sample collection. Data recovered from the study showed the occurrence of 61 species of plankton belonging to two (2) classes, 8 families and genera. A total of 486 organisms were recovered from the surface water out of which 394 (81.06%) were phytoplankton and 92 (18.93%) were zooplankton. The families of planktons identified were Bacillariophyceae, Cyanophyceae, Chlorophyceae, Xanthophyceae, Euglenophyceae, Dinophyceae, Copepod, and Cladocera. The family Bacillariophyceae had the highest species diversity (144) within WO/SW1 having the highest speci...
The crop-outs of Ajali and Benin Formations within the Arochukwu – Odoro Ikpe Axis Southeast Nige... more The crop-outs of Ajali and Benin Formations within the Arochukwu – Odoro Ikpe Axis Southeast Nigeria, was studied for sedimentological characteristics. Standard methods applied in fieldwork and sedimentological studies were used for this study. The results of the particle size distribution of the Ajali Formation is as follows grain size (0.73- 2.23, mean 1.38); sorting (0.9 - 2.7, mean 1.29); Skewnes (-0.06 - 0.67, mean 0.03); kurtosis (1.19 - 1.39, mean 1.27); grain size distribution – Unimodal to Polymodal. Benin Formation, grain size (-1.92 to 1.16, mean -0.35); sorting (0.60 to 2.24, mean 1.45); Skewnes (-0.22 to 0.76, mean 0.19); kurtosis (0.60 to 1.80) and grain size distribution is Unimodal to Polymodal. Both formations are coarse to very fine and pebbly (mean median grain size), poorly sorted, negatively skewed to strongly finely skewed (mean nearly symmetrical) and leptokurtic Also both formations are very poorly to poorly sorted, have similar mode of transportation which g...
The petroleum refining industry plays a significant role in the national economic activities of B... more The petroleum refining industry plays a significant role in the national economic activities of Bangladesh. Though, potential environmental hazards related to petroleum and petrochemical factories have caused increased concern for peoples near them. This apprises provides a general impression of the processes involved and some possible environmental contamination associated with petroleum industries. Petroleum refineries separate crude oils into different petroleum materials through a sequence of physical and chemical separation methods. The refining industry provided numerous widely used products as well as gasoline, diesel, kerosene, motor oil, asphalt, waxes, and petroleum gel. But refineries are usually considered a key source of contaminants in areas where they are located and contaminate the air, soil, water system. Pollutant releases from the petroleum refineries occur in every stage of the oil-producing procedure from the extraction to the consumption chain. Now a day, due to vast environmental contamination it is crucially needed to find out of alternative cleaner energy sources rather than liquid petroleum. Bangladesh, a highly populated country and have no sufficient ability to tackle any natural and anthropogenic pollution. So, the environmental impact of petroleum refinery emission in Bangladesh is a serious concern to the government and environmentalists.
Integration of subsurface geological and petrophysical data is necessary for a robust structural ... more Integration of subsurface geological and petrophysical data is necessary for a robust structural interpretation. Complementary structural analysis is a comparative procedure that involves pairing structural interpretations from two or more sources for improved understanding of subsurface structures. The pairing increases the robustness of any structural analysis by providing the geological explanation (type of depositional environment, temporal and spatial considerations), or any other scientific explanation (e.g. tool type, depth of investigation) to support the outcome. In oil field management, structural analysis of the reservoir provides invaluable information on subsurface structural features (faults, fractures) and reservoir parameters that may impact oil drainage. In this study, a complementary structural analysis scheme was applied to a Middle to Late Miocene channelized reservoir in the Niger Delta area. The reservoir consists of several individual turbidite complexes inclu...
The crop-outs of Ajali and Benin Formations within the Arochukwu – Odoro Ikpe Axis Southeast Nige... more The crop-outs of Ajali and Benin Formations within the Arochukwu – Odoro Ikpe Axis Southeast Nigeria, was studied for sedimentological characteristics. Standard methods applied in fieldwork and sedimentological studies were used for this study. The results of the particle size distribution of the Ajali Formation is as follows grain size (0.73- 2.23, mean 1.38); sorting (0.9 - 2.7, mean 1.29); Skewnes (-0.06 - 0.67, mean 0.03); kurtosis (1.19 - 1.39, mean 1.27); grain size distribution – Unimodal to Polymodal. Benin Formation, grain size (-1.92 to 1.16, mean -0.35); sorting (0.60 to 2.24, mean 1.45); Skewnes (-0.22 to 0.76, mean 0.19); kurtosis (0.60 to 1.80) and grain size distribution is Unimodal to Polymodal. Both formations are coarse to very fine and pebbly (mean median grain size), poorly sorted, negatively skewed to strongly finely skewed (mean nearly symmetrical) and leptokurtic Also both formations are very poorly to poorly sorted, have similar mode of transportation which g...
The controls of depositional environments on reservoir quality have been evaluated in terms of po... more The controls of depositional environments on reservoir quality have been evaluated in terms of porosity and permeability of the Gabo Field, Niger Delta, Nigeria. Data used in this research include Well logs, Core data and photos, and grain size analysis for Wells 51 and 52 in the study area. Standard methods as applicable in petrophysical and sedimentological analysis has been adopted. Thirteen reservoir units have been identified in wells 51 and 52 which had 5 reservoirs cored each. The lithofacies units of the identified reservoirs across the study area, comprise pebbly sands, coarse -, medium -, fine- and very fine-grained sands, sandy mud, silty sands and heteroliths. The heteroliths – very fine-grained silty muds are highly bioturbated. Ophiomorpha and skolithos are the major trace fossils with sedimentary structures (ripple lamination, wavy lenticular and planar beds, cross bedded sands, coarsening and fining upward). The facies associations interpreted for the study area are ...
The work of the paper focused on the post impact of oil spill contamination of groundwater in Bas... more The work of the paper focused on the post impact of oil spill contamination of groundwater in Bassambiri Nembe Bayelsa State. Groundwater samples were sampled from hand dug wells from eight stations including the control point for physico-chemical investigation using sterilized glass bottles. Sampling was carried out upstream and downstream on the Santa Barbara River across the stations and the results are as follows surface water pH ranged 6.90-7.50, electrical conductivity 19739.41 µS/cm-28920.64 µS/cm and Chloride 6019.63-9274.82 mg/l. The Total Dissolved Solids (TDS) varied from 10472.72 mg/l-16538.19 mg/l dissolved oxygen (DO) 6.21 mg/l-7.371 mg/l while the mean biochemical oxygen demand (BOD) 0.09 ± 0.52 mg/l-2.4 ± 0.81 mg/l, temperature 28.04˚C-31.79˚C while total alkalinity is 43.95 mg/L-73.87 mg/L. Calcium ion ranged 375.68 mg/l-536.72 mg/l, Magnesium ion 88.35-243.24 mg/l and Potassium ion 41.27-121.17 mg/l. The results of the study showed that the pH, salinity, alkalinity, total suspended solids (TSS), Chlorides, Phosphates, and Nitrates are within permissible limits of the WHO, however the electrical conductivity, TDS, turbidity, DO, BOD, and hardness exceeded WHO permissible limits for drinking water. Total Petroleum Hydrocarbon (TPH) and Heavy metals had low concentrations in the Santa Barbara River across the study area suggesting that surface water is not polluted. However, the surfactants used initially to contain the oil pollution were effective based on this research.
The work of the paper focused on the post impact of oil spill contamination of groundwater in Bas... more The work of the paper focused on the post impact of oil spill contamination of groundwater in Bassambiri Nembe Bayelsa State. Groundwater samples were sampled from hand dug wells from eight stations including the control point for physico-chemical investigation using sterilized glass bottles. Sampling was carried out upstream and downstream on the Santa Barbara River across the stations and the results are as follows surface water pH ranged 6.90-7.50, electrical conductivity 19739.41 µS/cm-28920.64 µS/cm and Chloride 6019.63-9274.82 mg/l. The Total Dissolved Solids (TDS) varied from 10472.72 mg/l-16538.19 mg/l dissolved oxygen (DO) 6.21 mg/l-7.371 mg/l while the mean biochemical oxygen demand (BOD) 0.09 ± 0.52 mg/l-2.4 ± 0.81 mg/l, temperature 28.04˚C-31.79˚C while total alkalinity is 43.95 mg/L-73.87 mg/L. Calcium ion ranged 375.68 mg/l-536.72 mg/l, Magnesium ion 88.35-243.24 mg/l and Potassium ion 41.27-121.17 mg/l. The results of the study showed that the pH, salinity, alkalinity, total suspended solids (TSS), Chlorides, Phosphates, and Nitrates are within permissible limits of the WHO, however the electrical conductivity, TDS, turbidity, DO, BOD, and hardness exceeded WHO permissible limits for drinking water. Total Petroleum Hydrocarbon (TPH) and Heavy metals had low concentrations in the Santa Barbara River across the study area suggesting that surface water is not polluted. However, the surfactants used initially to contain the oil pollution were effective based on this research.
The knowledge of pore pressure plays an essential role in the drilling, planning, and production ... more The knowledge of pore pressure plays an essential role in the drilling, planning, and production operations in the oil and gas industry. The aim of this research is to estimate pore pressure from well log data of the Unag Field situated Offshore in the Niger Delta Nigeria. The overpressured layers were categorised into three overpressure zones (A, B and C) using velocity and effective stress methods, respectively. The identified overpressure zones vary in thickness across the wells. Results reveal that overpressures were generated by disequilibrium compaction and pore pressures. The results further show that undercompaction (loading) mechanism of overpressure, which is characterised by gradual, and increasing slight overpressure with depth, may be the main cause of overpressure especially in zones A and B across the three wells. The research compares the Eaton's and Bower's pore pressure prediction methods. The Bower's method predicted pore pressure values better than the Eaton's method, which is in close agreement with the actual RFT data for three different zones in the studied wells. Hence, the Bower's method is proposed as useful and a better method for predicting pore pressures in other fields in the Niger Delta Basin using well logs.
International Journal of Research and Innovation in Applied Science (IJRIAS), 2021
Abstract: In this study, reservoir sands from seven wells Kanga
Oil field in the Onshore Niger De... more Abstract: In this study, reservoir sands from seven wells Kanga Oil field in the Onshore Niger Delta were analyzed sedimentologically to determine the level of spatial distribution of significant heterogeneity in the subsurface and infer the depositional environments. From the sedimentological analyses, three reservoir intervals J100, K100 and L100 of interest were identified based on the gross thickness of the reservoir sand, cleanliness of the reservoir sand and presence of hydrocarbon, and correlated across the field using suites of wire line logs. The environment of deposition was interpreted using gamma-ray log motif and lithologic description from Sidewall samples. The environments of deposition have been interpreted as Channel sands, Upper Shoreface, Lower Shoreface and Marine Shale, a reflection that the sediments was deposited in medium to low energy environment which favors the deposition of fine to medium grains sediments Key words: sedimentology, depositional environment, reservoir, lithologic and hydrocarbon
International Journal of Agriculture and Environmental Research
Plankton are the main varied group of aquatic organisms that play major roles in the aquatic envi... more Plankton are the main varied group of aquatic organisms that play major roles in the aquatic environment as primary producers. The study focused on the effect of crude oil Spill on Plankton composition in Santa Barbara River, Nembe, Bayelsa State. Samples were collected and preserved in 5% formalin from ten (10) water sampling locations with one serving as control in four replicates. Standard plankton net of 55m mesh size was used for sample collection. Data recovered from the study showed the occurrence of 61 species of plankton belonging to two (2) classes, 8 families and genera. A total of 486 organisms were recovered from the surface water out of which 394 (81.06%) were phytoplankton and 92 (18.93%) were zooplankton. The families of planktons identified were Bacillariophyceae, Cyanophyceae, Chlorophyceae, Xanthophyceae, Euglenophyceae, Dinophyceae, Copepod, and Cladocera. The family Bacillariophyceae had the highest species diversity (144) within WO/SW1 having the highest speci...
The crop-outs of Ajali and Benin Formations within the Arochukwu – Odoro Ikpe Axis Southeast Nige... more The crop-outs of Ajali and Benin Formations within the Arochukwu – Odoro Ikpe Axis Southeast Nigeria, was studied for sedimentological characteristics. Standard methods applied in fieldwork and sedimentological studies were used for this study. The results of the particle size distribution of the Ajali Formation is as follows grain size (0.73- 2.23, mean 1.38); sorting (0.9 - 2.7, mean 1.29); Skewnes (-0.06 - 0.67, mean 0.03); kurtosis (1.19 - 1.39, mean 1.27); grain size distribution – Unimodal to Polymodal. Benin Formation, grain size (-1.92 to 1.16, mean -0.35); sorting (0.60 to 2.24, mean 1.45); Skewnes (-0.22 to 0.76, mean 0.19); kurtosis (0.60 to 1.80) and grain size distribution is Unimodal to Polymodal. Both formations are coarse to very fine and pebbly (mean median grain size), poorly sorted, negatively skewed to strongly finely skewed (mean nearly symmetrical) and leptokurtic Also both formations are very poorly to poorly sorted, have similar mode of transportation which g...
The petroleum refining industry plays a significant role in the national economic activities of B... more The petroleum refining industry plays a significant role in the national economic activities of Bangladesh. Though, potential environmental hazards related to petroleum and petrochemical factories have caused increased concern for peoples near them. This apprises provides a general impression of the processes involved and some possible environmental contamination associated with petroleum industries. Petroleum refineries separate crude oils into different petroleum materials through a sequence of physical and chemical separation methods. The refining industry provided numerous widely used products as well as gasoline, diesel, kerosene, motor oil, asphalt, waxes, and petroleum gel. But refineries are usually considered a key source of contaminants in areas where they are located and contaminate the air, soil, water system. Pollutant releases from the petroleum refineries occur in every stage of the oil-producing procedure from the extraction to the consumption chain. Now a day, due to vast environmental contamination it is crucially needed to find out of alternative cleaner energy sources rather than liquid petroleum. Bangladesh, a highly populated country and have no sufficient ability to tackle any natural and anthropogenic pollution. So, the environmental impact of petroleum refinery emission in Bangladesh is a serious concern to the government and environmentalists.
Integration of subsurface geological and petrophysical data is necessary for a robust structural ... more Integration of subsurface geological and petrophysical data is necessary for a robust structural interpretation. Complementary structural analysis is a comparative procedure that involves pairing structural interpretations from two or more sources for improved understanding of subsurface structures. The pairing increases the robustness of any structural analysis by providing the geological explanation (type of depositional environment, temporal and spatial considerations), or any other scientific explanation (e.g. tool type, depth of investigation) to support the outcome. In oil field management, structural analysis of the reservoir provides invaluable information on subsurface structural features (faults, fractures) and reservoir parameters that may impact oil drainage. In this study, a complementary structural analysis scheme was applied to a Middle to Late Miocene channelized reservoir in the Niger Delta area. The reservoir consists of several individual turbidite complexes inclu...
The crop-outs of Ajali and Benin Formations within the Arochukwu – Odoro Ikpe Axis Southeast Nige... more The crop-outs of Ajali and Benin Formations within the Arochukwu – Odoro Ikpe Axis Southeast Nigeria, was studied for sedimentological characteristics. Standard methods applied in fieldwork and sedimentological studies were used for this study. The results of the particle size distribution of the Ajali Formation is as follows grain size (0.73- 2.23, mean 1.38); sorting (0.9 - 2.7, mean 1.29); Skewnes (-0.06 - 0.67, mean 0.03); kurtosis (1.19 - 1.39, mean 1.27); grain size distribution – Unimodal to Polymodal. Benin Formation, grain size (-1.92 to 1.16, mean -0.35); sorting (0.60 to 2.24, mean 1.45); Skewnes (-0.22 to 0.76, mean 0.19); kurtosis (0.60 to 1.80) and grain size distribution is Unimodal to Polymodal. Both formations are coarse to very fine and pebbly (mean median grain size), poorly sorted, negatively skewed to strongly finely skewed (mean nearly symmetrical) and leptokurtic Also both formations are very poorly to poorly sorted, have similar mode of transportation which g...
The controls of depositional environments on reservoir quality have been evaluated in terms of po... more The controls of depositional environments on reservoir quality have been evaluated in terms of porosity and permeability of the Gabo Field, Niger Delta, Nigeria. Data used in this research include Well logs, Core data and photos, and grain size analysis for Wells 51 and 52 in the study area. Standard methods as applicable in petrophysical and sedimentological analysis has been adopted. Thirteen reservoir units have been identified in wells 51 and 52 which had 5 reservoirs cored each. The lithofacies units of the identified reservoirs across the study area, comprise pebbly sands, coarse -, medium -, fine- and very fine-grained sands, sandy mud, silty sands and heteroliths. The heteroliths – very fine-grained silty muds are highly bioturbated. Ophiomorpha and skolithos are the major trace fossils with sedimentary structures (ripple lamination, wavy lenticular and planar beds, cross bedded sands, coarsening and fining upward). The facies associations interpreted for the study area are ...
Petrophysical Evaluation of Hydrocarbon Bearing Sands in “MANIN” Marginal Field, Onshore Niger Delta, 2020
Wirelinelog was used in the analysis of the reservoir properties of “Manin” Marginal field, onsho... more Wirelinelog was used in the analysis of the reservoir properties of “Manin” Marginal field, onshore depobelt, Niger Delta. The study essentially focused on determining properties such as lithology, depositional environments and petrophysical properties such as shale volume, porosity (Φ), net pay thickness, net to gross ratio and water saturation. Wireline data of four wells namely well 4, well 7, well 5 and well 11 were evaluated by identifying hydrocarbon bearing sands in each of the four wells and then estimating the petrophysical properties for these reservoirs. The evaluated reservoir sand units mapped were laterally continuous with gamma ray log signatures that are basically cylindrical with a fining upward sequence interpreted as a fluvial dominated channel. The environment of deposition was inferred to be between the foreshores to lower shoreface with reservoirs typically showing a consistent aggradational stacking pattern. A total of four reservoir sand units (A-D) were analyzed for petrophysical parameters such as porosity , net-pay thickness, volume of shale (Vsh), net to gross ratio and water saturation (Sw). Porosity within the field ranged from 25.9-31.9%, volume of shale ranged from 0.204-0.430, while water saturation value ranged from 0.015-0.220. Sand A, B and C had excellent porosity values while sand D had moderate porosity value. The petrophysical properties evaluated reveals possibilities of future drilling prospects in the “Manin” field.
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Oil field in the Onshore Niger Delta were analyzed
sedimentologically to determine the level of spatial distribution
of significant heterogeneity in the subsurface and infer the
depositional environments. From the sedimentological analyses,
three reservoir intervals J100, K100 and L100 of interest were
identified based on the gross thickness of the reservoir sand,
cleanliness of the reservoir sand and presence of hydrocarbon,
and correlated across the field using suites of wire line logs. The
environment of deposition was interpreted using gamma-ray log
motif and lithologic description from Sidewall samples. The
environments of deposition have been interpreted as Channel
sands, Upper Shoreface, Lower Shoreface and Marine Shale, a
reflection that the sediments was deposited in medium to low
energy environment which favors the deposition of fine to
medium grains sediments
Key words: sedimentology, depositional environment, reservoir,
lithologic and hydrocarbon
Oil field in the Onshore Niger Delta were analyzed
sedimentologically to determine the level of spatial distribution
of significant heterogeneity in the subsurface and infer the
depositional environments. From the sedimentological analyses,
three reservoir intervals J100, K100 and L100 of interest were
identified based on the gross thickness of the reservoir sand,
cleanliness of the reservoir sand and presence of hydrocarbon,
and correlated across the field using suites of wire line logs. The
environment of deposition was interpreted using gamma-ray log
motif and lithologic description from Sidewall samples. The
environments of deposition have been interpreted as Channel
sands, Upper Shoreface, Lower Shoreface and Marine Shale, a
reflection that the sediments was deposited in medium to low
energy environment which favors the deposition of fine to
medium grains sediments
Key words: sedimentology, depositional environment, reservoir,
lithologic and hydrocarbon