Fine Identification and Quantitative Characterization of Interlayers in Thick Oil Reservoirs of Bohai L Oilfield

Abstract

As water-flooded oilfields enter the stage of high water cut and high recovery degree, interlayers have an increasingly significant impact on the distribution of remaining oil in thick oil reservoirs. Taking the thick oil reservoirs of L Oilfield as the target, this paper comprehensively applies core, logging, and well logging data to analyze the types and genesis of interlayers in the oilfield. By adopting the core-calibrated logging method, quantitative identification criteria for interlayers are established, enabling quantitative interpretation of physical property interlayers. Through fine identification of interlayers at different hierarchical grades in L Oilfield, this study investigates the spatial distribution patterns of interlayers across various grades, quantitatively characterizes their distribution rules, examines their influence on remaining oil distribution, and provides guidance for later potential tapping.