Application Of Wireline Data In Petroleum Exploration To Delineate The Hydrocarbon Potential Of Tertiary Sandstone Reservoirs Of Niger Delta Oil Field

Lying somewhere between Production Geology, Operations, Seismology, Reservoir Engineering and Production Technology, petrophysics plays a key role in ensuring the successful development of a well, and the characterization of a reservoir. The exploration of hydrocarbon exploration in Niger Delta spans over several decades althogh the exploration exercise is gradually shifting to the deep offshore, the channel sand deposits is targeted as the main exploration point for both the onshore and offshore exercise. This research paper reiterates the relevance of petrophysical analysis of well log data in establishing the hydrocarbon potential of sandstone reservoirs of Niger Delta Basin. The well logs data was obtained in electronic version (LAS file), the quality checks, accuracy, content policy and confidentiality remained the right of Department of Petroleum Resources (D.P.R.) Nigeria. The wireline data comprises of gamma ray, resisitiviy (deep), sonic, and neutron logs, intergrated with the calculated field curves which include archies water saturation (SW), total porosity (PHiT), bulk-volume water (BVW) and shale volume (VSH), from two exploratory wells namely EMI-04 and EMI-05. The interpretation for the petrophyiscal analysis was conducted using Schlumberger’s PETREL E&P software 2013, while the field recorded logs and the calculated curves were all presented in different tracks Several hydrocarbon bearing intervals were delineated from the interpretation of these suites of wireline data. The hydrocarbon bearing intervals across the two wells were categorized into three distinctive reservoirs, Reservoir A, encountered between intervals 2610ft and 3068ft, has an average pay thickness of 40.4ft, Reservoir B encountered along interval 4011ft to 4690ft has an average pay thickness of 16ft, reservoir C encountered between interval 5305ft and 6930ft with an average pay thickness of 61ft. The average hydrocarbon saturation, effective porosity and bulk-volume water for reservoir A, B and C, are 52%, 32% and 0.0580; 35 %, 28% and 0.2096; and 42%, 22% and 0.1572 respectively. The values of effective porosity and hydrocarbon saturation calculated for the hydrocarbon bearing zones are good enough for commercial accumulation and production of hydrocarbon. The petrophysical analysis of these reservoirs indicated that, the reservoirs could be highly productive. Due to the limited availability of logs, two types of fluids; water and hydrocarbon could be delineated.