--> Abstract: Integrated Reservoir Description Using Core, Wire-Line Logs, 3-D Seismic Data, and Production History: Field Development Case Studies of Deltaic and Deep-Water Sands, Offshore Nigeria, by KREISA, RONALD D.; #90938 (1997)

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Abstract: Integrated Reservoir Description Using Core, Wire-Line Logs, 3-D Seismic Data, and Production History: Field Development Case Studies of Deltaic and Deep-Water Sands, Offshore Nigeria

KREISA, RONALD D., with acknowledgments to S. C. LEININGER, U. J. EWHERIDO, J. P. PAUL, S. D. JOINER, AND T. O. BABYEMI

In Mobil Producing Nigeria/Nigerian National Petroleum Company Joint Venture acreage, approximately 20 fields produce from Miocene and Pliocene reservoir sands. The sands were formed in one of three settings: deltaic, deltaic sands highly modified during one of two episodes of shelf-margin collapse, and slope deposits. Fields developed in the slope sands alone contain more than 4 billion bbl of oil in place, with daily production exceeding 200,000 bbl/day. With well costs of $4 to $5 million each (~80 wells/yr) and platforms that may exceed $200 million, the potential impact of improved reservoir description is immense.

More than 35,000 ft of core have been taken in these rocks. Through integration with well logs, 3-D seismic data, and pressure and production data, the information from these cores contributes to all aspects of Mobil's methodology for field description and development:

1. Laboratory-measured rock properties (grain size, petrography, porosity, permeability, capillary pressure. end-point saturations, etc.) enable prediction of reserves, better ties of wells to seismic data, and improved recovery through optimization of perforation intervals, completion methodology (e.g., sand-production control), and flow rates.

2. Delineation of barrier and "baffle" facies, which compartmentalize the reservoir, is essential. Condensed sections prove critical in this regard.

3. Interpretation of depositional processes, essential to the geologic model and an understanding of interwell reservoir architecture. This allows more accurate interpretation of seismic data and improves the selection of development-well locations.

4. Quantitative calibration of well logs allows the recognition in uncored wells of all the preceding aspects. The calibration process involves the entire curve suite and is rigorous when compared with the traditional "log motif" approach.

AAPG Search and Discovery Article #90938©1997-1998 AAPG Distinguished Lecturers