The Controlling Effect of Diagenesis on Hydrocarbon Charging in the Upper 3rd Member of Eogene Shahejie Formation of the KL Oil Field, Laizhou Bay Sag, Bohai Bay Basin, China
Keywords:
Bohai Bay Basin, Laizhou Bay Sag, Storage space, Diagenesis, Hydrocarbon chargingAbstract
By comprehensively utilizing various analysis and testing methods such as casting thin sections, scanning electron microscopy, and fluid inclusions, combined with drilling and logging data, burial history, sedimentary systems and other related research results, a detailed analysis was conducted on the diagenesis of the upper 3rd Member of Eogene Shahejie Formation(E2s3u) in KL oil filed and its control over hydrocarbon accumulation. The research results indicated that E2s3u in KL oil filed belongs to the "high porosity, medium-high permeability" reservoir, and the reservoir space are still mainly composed of intergranular pores, with secondary intergranular pores and mold pores visible, the overall diagenesis of the reservoir is in the middle diagenesis stage A, characterized by "medium compaction, strong dissolution, and weak cementation". The maturity of organic matter in E2s3u is in the semi mature to low mature stage, which is a stage of massive discharge of organic acids, the acidic dissolution and pore enlargement of feldspar and calcite provide space for the charging of hydrocarbon in Laizhou Bay Sag.The research results provide reference significance for hydrocarbon exploration on the southern slope of Laizhou Bay Sag.
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