Discrimination of pore fluid and lithology of a well in X Field, Niger Delta, Nigeria

Agbasi, Okechukwu Ebuka; Igboekwe, M. U.; Chukwu, Godwill U.; Etuk, Sunday Edet

doi:10.1007/s12517-018-3610-7

Cited by 19 publications

(10 citation statements)

References 8 publications

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“…This indicates that the physical characteristics of sandstone reservoirs are the result of complex interplay of sedimentological processes. As a consequence, the reconstructing of sandstone successional sedimentological settings offers the ultimate framework for characterizing and evaluating reservoir character variation [13][14][15].…”

Section: Geology Of the Study Areamentioning

confidence: 99%

“…The resistivity logs were used in combination with the GR logs to distinguish among oil-gas and non-oil-gas bearing sections. By correlating equivalent intervals of log motif, the gamma-ray log was employed to achieve lithologic correlation of homologous strata among wells [14]. This was expanded to include the lateral extent of prospective hydrocarbon reserves calculated by connecting units across wells.…”

Section: Petrophysical Analysismentioning

confidence: 99%

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Petrophysical Evaluation of H-field, Niger Delta Basin for Petroleum Plays and Prospects

Harry

Etim

Okechukwu

2022

Materials and Geoenvironment

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As a result of a combination of several methodologies, the H-Field, Niger-Delta, has been delineated. To identify probable reservoirs, seals, and source rocks in the study area, this study integrates sequence stratigraphy with petrophysical concepts through a comprehensive analysis of 3D seismic and well logging datasets. According to the 3D facies model, reservoirs are dominated by sand and are laterally extensive. They were then upscaled and stochastically distributed to create a 3D reservoir property model. On average, the porosity of these clastic reservoirs ranges from 22 to 28%. Reservoir net-to-gross (NTG) ratios range from 0.67 to 0.96. Water saturation ranges from 8% to 30%, while hydrocarbon saturation ranges from 70% to 92%. Four gas-bearing units and six oil-bearing units are present in reservoirs P 0.5 and P 1 compartments. All reservoir intervals’ oil and gas volumes are evaluated based on the hydrocarbon distribution. Geological models of the subsurface, such as the one in this paper, are crucial for future reservoir development programs.

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Section: Geology Of the Study Areamentioning

confidence: 99%

Section: Petrophysical Analysismentioning

confidence: 99%

Petrophysical Evaluation of H-field, Niger Delta Basin for Petroleum Plays and Prospects

Harry

Etim

Okechukwu

2022

Materials and Geoenvironment

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“…In recent days, AVO analysis has been widely applied in hydrocarbon exploration studies [18][19][20][21][22] . In the Niger Delta, AVO techniques have been used to determine anomalous and gas zones in wells [23][24][25][26][27] , detect hydrocarbon reservoirs on pre-stack time seismic data [28] , and identify hydrocarbon-charged reservoirs using Rock physics modeling and Lamda-Mu-Rho (LMR) seismic inversion [28] . The focus of the research has primarily been on conducting AVO Inversion analysis on pre-stack seismic data and well information to reveal geologic structures and impedance contrasts within lithology.…”

Section: Introductionmentioning

confidence: 99%

Amplitude Variation with Offset (AVO) Inversion for Reservoir Visualization: A Case Study of Taje Field, Niger Delta, Nigeria

Oborie,

Francis,

Eteh

2024

adv. in geol. and geotech. eng. res.

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Amplitude Variation with Offset (AVO) inversion analysis was performed on pre-stack seismic data and well information gathered from the shallow offshore area of the Niger Delta. This analysis aimed to improve reservoir visualization and employed the Hampson Russell Geoview, AVO, and STRATA software tools. The seismic data were provided in Seg-Y format, covering an in-line range from 4503 to 5569, an x line range from 1434 to 2026, and an angle of incidence range of 0 to 45°. The study centered on the Taje well_026. Within the subsurface, the authors identified five distinct reservoirs, labeled A to E, located at various depths ranging from 3057.50 to 3115.00 m, 3115.00 to 3157.50 m, 3157.50 to 3190.00 m, 3190.00 to 3200.00 m, and 3200.00 to 3239.00 m, respectively. These reservoirs exhibited different fluid compositions. Reservoir A, primarily composed of sandstone, contained brine, whereas Reservoirs B and D, dominated by shale, contained gas. On the other hand, Reservoirs C and E, both comprised of sandstone, held oil. Reservoir C is distinguished by its clean sandstone unit. The inversion results revealed that both Reservoirs C and E consisted of low impedance sand layers surrounded by higher impedance shale layers. The gas migrated from the reservoir and was trapped within the shale units due to deformation of the lithological units, likely induced by stress accumulation. This migration process was facilitated by the shale’s inability to undergo smearing, possibly as a result of faulting mechanisms.

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“…Lithology identification is the foundation for tight reservoir evaluation and hydrocarbon exploitation (Zhang C. S. et al, 2019;Mateen et al, 2022). Mineral composition, structure, and cementation mode are directly related to the physical properties (Enkin et al, 2020;Bai et al, 2021), pore structure (Slatt and O'Neal, 2011), and wettability of reservoirs (Esfahani and Haghighi, 2004;Sauerer et al, 2020), and affect the distribution of reservoir fluid (Wu et al, 2016) and the evaluation accuracy of reservoir parameters (Agbasi et al, 2018). Lithology can be identified by experimental test techniques, such as Scanning Electron Microscope (SEM) (Quaid et al, 2016;Li et al, 2017), Cast Thin Section (CTS) (Borazjani et al, 2016;Dong et al, 2019), X-Ray Diffraction (XRD) (Kahle et al, 2002), and Computed Tomography Scan (CT) (Kyle and Ketcham, 2015;Ma et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Resistivity correction and water saturation evaluation for calcareous tight sandstone reservoir: A case study of G oil field in Sichuan Basin

Zhang

Jia²,

Hu³

et al. 2023

Front. Earth Sci.

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The calcareous tight sandstone reservoir of the Triassic Shaximiao Formation in the G oil field of the central Sichuan Basin has high calcium content and abnormally high resistivity, making it difficult to reveal the oil-bearing property, evaluate water saturation, and calculate geological reserves. In this work, a petrophysical volume model of calcareous tight sandstone was established through systematic petrophysics experiments and the analysis of the main control factors of oil bearing grade. A method of using conventional logging data to calculate the calcium content of the reservoir and correct the calcium content of resistivity was proposed. After resistivity correction, the water saturation of the tight calcareous sandstone reservoir was more accurately calculated based on variable rock-electro parameters. The results indicated that with the decrease in calcium content and the increase in feldspar content, the reconstructive effect of corrosion was enhanced, the physical properties and pore structure of the reservoir were improved, and the oil bearing grade increased. The calcium content of the reservoir can be continuously calculated by the volume model and the crossplot of logRtn/ACn and Vca/POR. The resistivity of the reservoir with a high calcium content can be corrected using the resistivity index of calcium content (Ica). In conjunction with the water saturation calculation model using variable parameters, the accuracy of calculated water saturation was 14% and 5.8% higher than the calculation results without resistivity correction and using fixed rock-electro parameters, which can satisfy the requirements for reservoir evaluation and the calculation accuracy of hydrocarbon reserves.

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Discrimination of pore fluid and lithology of a well in X Field, Niger Delta, Nigeria

Cited by 19 publications

References 8 publications

Petrophysical Evaluation of H-field, Niger Delta Basin for Petroleum Plays and Prospects

Petrophysical Evaluation of H-field, Niger Delta Basin for Petroleum Plays and Prospects

Amplitude Variation with Offset (AVO) Inversion for Reservoir Visualization: A Case Study of Taje Field, Niger Delta, Nigeria

Resistivity correction and water saturation evaluation for calcareous tight sandstone reservoir: A case study of G oil field in Sichuan Basin

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