Interbed detection and oil-gas characteristics in shale oil reservoir in bonan depression base on well logging curve reprocessing
Es3 is a good shale oil reservoir in the Bonan area of the Jiyang depression of Shengli oilfield,in which carbonate interbed and sandstone interbed are widely developed and densely distributed vertically to form interbed groups.The distribution of interbed has greater control over shale oil enrichment,and detecting interbed groups has become the key to shale oil explora-tion.However,the single-layer thickness of the interlayer is thin(1-2 m),the longitudinal stacking is complex,the lateral change is fast,and the logging curve does not have good corresponding electrical characteristics.Hence,the detection of the in-terlayer group is challenging.This paper first reprocessed the logging curve based on the lithologic characteristics described by drilling cuttings and coring,which significantly highlights the electrical characteristics of the interlayer group.Through the anal-ysis of the density and productivity of the interlayer group of horizontal wells,the productivity of the interlayer group develop-ment section accounts for more than 54％of the total productivity.At the same time,high-resolution GR inversion is carried out based on log curve reprocessing to obtain the plane distribution characteristics of the interlayer group,which is very consistent with the current shale oil development results,thus effectively revealing the possible enrichment areas of shale oil in the target horizon,providing a solid basis for the exploration and development of shale oil in the later period.
shale oilinterbed groupslog reprocessingseismic inversionoil and gas characteristics
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