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Evaluatio. o. the Influence o. Shale o. the Petro.hysical Pro.erties o. Hydro.arbo.-Bearing Reservo.r Sand in “CAC” Field in the Niger Delta, Nigeria

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Internatio.al Jo.rnal o. Geo.ciences 2022年第1期13卷 71-92页

作者： Charles C. Ugbo. Chinwe Adao.i o.umselu jethro o. ogboke Department o. Geo.o.y University of Nigeria Nsukka Enugu State Nigeria NNPC. Lago. Nigeria

This study aims at evaluating the influence o. the presence o. shale o. the quality o. reservo.r sand in “CAC-Field”, Co.stal swamp Niger Delta by integrating suites o. well lo.s and 3D pre-stack seismic data. Shales in the reservo.r po.e interpretatio. challenges as they fo.m baffles to.fluid flo. and reduce effective po.o.ity. The data used included well lo.s (density, gamma ray, neutro., resistivity) and 3D seismic data. Petrel and Interactive Petro.hysics so.tware were ado.ted fo. the analyses. The Vclay/effective po.o.ity cro.s-plo.s were used to.determine the clay distributio. patterns hence the influence o. shale o. the petro.hysical pro.erties o. the hydro.arbo. reservo.r. Result o. the well co.relatio. yielded 12 reservo.rs with 4 (RES 4 - RES 7) being hydro.arbo. bearing and laterally co.tinuo.s acro.s the 4 wells, (CAC-1 - CAC-4) fo.ming the fo.us o. the study. Evidence o. an NW-SE trending delta progradation in the CAC field is represented by the increasing sandiness downdip, at both intermediate and the shallow horizons. Thickening of the reservoir in some instances may be structurally controlled due to faulting. The results from the petrophysical evaluation show Vclay ranges of 13% - 21% and good to very good porosity values that vary from 15% - 25%. The permeability range from 240.49 - o.t-family:Verdana;">2406.49 mD except fo. the sands in RES 7, CAC-3 well where the permeability was lo. (91 mD). Additio.ally, the Vclay/Effective Po.o.

关键词： Petro.hysical Pro.erties Reservo.r Quality Shaliness Permeability Cro.s-Plo. Hydro.arbo.

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Electrical Resistivity So.nding fo. Gro.ndwater Investigatio. aro.nd Enugu Metro.o.is and the Enviro.s, So.theast Nigeria

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Internatio.al Jo.rnal o. Geo.ciences 2022年第1期13卷 54-70页

作者： Claris C. Nwachukwu Charles C. Ugbo. o.im jethro ogboke Department o. Geo.o.y University of Nigeria Nsukka Enugu State Nigeria NNPC Lagos Nigeria

This repo.t evaluates the use o. electrical metho. and bo.eho.e data to.investigate the subsurface to.delineate the gro.ndwater po.ential in Enugu metro.o.is and the enviro.s, so.th-eastern Nigeria o.her than rely o.ly o. resistivity metho. which could lead to interpretation error. Integrating these 2 data sets is key in this study. The study area is located in the Anambra Basin and is underlain by Nkporo/Enugu Shale which is overlain by the Mamu Formation. It is bounded by Latitudes 6°2 0'00"N to 6°30'00"N and Longitudes 7°25'00"E to 7°35'00"E and covers surface area of about 342 m2. Thirty-one vertical electrical soundings (VES) were carried out across the area using the Schlumberger electrode array with current electrode separation from 2 to 500 m to identify the depths and resistivity values of the identified geo-electric layers. Through data analysis using WinResist software, the apparent resistivity, thicknesses and depths and the thicknesses of the aquifers were generated. The resistivity o.t-family:Verdana;">and depths were mo.elled to.generate resistivity map and depth map. The resistivity o.

关键词： Electrical Metho. Vertical Electrical So.nding Gro.ndwater Aquifer Apparent Resistivity

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