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ABSTRACT: U.S. Gulf Coast Field Experiences with Thin-Bed Well Log Analysis

Walter H. Fertl

Thinly bedded reservoir sand sequences are encountered throughout the world, and particularly as low-resistivity intervals in the U.S. Gulf Coast area. Despite apparent water saturation values ranging from 55 to 85% based on conventional log interpretation techniques, such intervals can be important producers.

However, recent technological advances in novel, high-resolution logging instrumentation, increased high-sample data acquisition, advances in high-resolution signal-processing (i.e., deconvolution) techniques, and newly developed thin-bed interpretation methods allow an improved reservoir description, such as reliable net pay count, enhanced well-to-well correlation, better thin-bed correlation of well log, core, and test data, and thus a more accurate location of oil-and gas-bearing stringers and their quantitative evaluation.

Several Gulf Coast field examples illustrate these concepts based on well logging, coring, and well test information.

AAPG Search and Discovery Article #90999©1990 GCAGS and Gulf Coast Section SEPM Meeting, Lafayette, Louisiana, October 17-19, 1990