Origin Analysis of Overpressures and Quantitative Assessment in the Dongfang Area, Yinggehai Basin
Keywords:
Yinggehai Basin; Overpressure genesis; Hydrocarbon-generating pressurization; Quantitative evaluationAbstract
Analysis of overpressure origins serves as the foundation for pressure prediction and hydrocarbon accumulation studies. Overpressure is widely distributed in the Dongfang area of the Yinggehai Basin, demonstrating a close yet complex relationship with hydrocarbon accumulation. It is im-perative to conduct in-depth research on the origins of overpressure and perform quantitative evaluation. Analysis utilizing well log combinations, loading-unloading curves, and acoustic velocity-density crossplots was conducted to investigate the origins of overpressure in the Dongfang area, Yinggehai Basin. Research results indicate that two-stage overpressure is widely developed in the Dongfang area of the Yinggehai Basin. The first overpressure zone occurs in strata above the mid-lower Yinggehai Formation at 1000-1500m depth，with a pressure coefficient over 1.3; the second segment is located in the Huangliu Formation below 2400m, with a pressure co-efficient exceeding 1.5. Acoustic time difference, density, and resistivity logging curves exhibit significant responses to overpressure, manifesting as reversals to varying degrees. Integrated analysis with multiple methods indicates that the overpressure in the Dongfang area of the Yinggehai Basin is primarily caused by a combination of hydrocarbon-generation pressurization and undercompaction. The magnitude of hydrocarbon-generated overpressure primarily ranges from 5 to 20 MPa, contributing 40% to 70% of the total overpressure.
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