Characteristics of abnormal high pressure and its controlling role on hydrocarbon accumulation in Xiagou Formation of the Ying′er Sag

doi:10.3969/j.issn.1006-6535.2025.01.005

Abstract

Abstract: To addressthe issues of unclear development characteristics of abnormal high pressure and unclear control of reservoir in Xiagou Formation of Ying′er Sag,based on the measured formation pressure data,the distribution characteristics,evolution law and genetic mechanism of abnormal high pressure were analyzed by using basin simulation technology,combined with logging,geochemistry and reservoir physical properties,and its influence on reservoir physical properties,oil and gas migration and accumulation,and organic matter evolution was clarified.The results show that the abnormal high pressure of Xiagou Formation in Ying′er Sag is generally developed,and the characteristics of vertical zoning are obvious.The top interface of abnormal high pressure gradually deepens from west to east,and the development horizon and amplitude of abnormal high pressure in different structural belts are obviously different.The pressure evolution and tectonic movement are synchronous.It has experienced five evolution stages:before the deposition of Zhonggou Formation,at the end of Zhonggou Formation,before the deposition of Paleogene,before the deposition of Neogene,and from Quaternary to present,and finally formed the characteristics of anomalous high pressure in the north and strong in the south.The formation mechanism of abnormal high pressure in the study area includes four kinds of effects:unbalanced undercompaction,hydrocarbon generation,clay mineral dehydration and overpressure transmission.Abnormal high pressure can slow down the damage of compaction to reservoir physical properties and play a positive role in improving reservoir physical properties.Abnormal high pressure provides the driving force for oil and gas migration,controls the direction and distribution range of oil and gas migration,and also inhibits the formation of organic matter and the evolution of hydrocarbon substances,and broadens the oil generation window.The research results indicate that the Changshaling tectonic belt is a favorable area for oil and gas migration and accumulation,which has a certain guiding role in the oil and gas exploration of Xiagou Formation in Ying′er Sag.

Key words: abnormal high pressure, developmental characteristics, genetic mechanism, hydrocarbon accumulation, Xiagou Formation, Ying′er Sag

CLC Number:

TE122

XIAO Wenhua, GAO Jihong, WEI Haoyuan, WEI Jun, ZHOU Zaihua, WU Haihong, GAO Xujia, ZHAO Xu. Characteristics of abnormal high pressure and its controlling role on hydrocarbon accumulation in Xiagou Formation of the Ying′er Sag[J]. Special Oil & Gas Reservoirs, 2025, 32(1): 40-50.

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