渤海湾盆地辽河坳陷西部冷家—雷家地区中-深层超压成因及其对油气成藏的影响

doi:10.11743/ogg20240109

Abstract

Abstract:

The moderately deep to deep strata in the Lengjia-Leijia area， western Liaohe Depression exhibit significant overpressure. It’s of great significance to understanding its genetic mechanism and its effects on hydrocarbon migration and accumulation in terms of hydrocarbon exploration therein. Based on measured formation pressure and temperature， log data， and structural analysis， we comprehensively investigate the characteristics and genetic mechanisms of overpressure in these strata and explore its role in hydrocarbon accumulation therein. The results indicate that the Lengjia-Leijia area is characterized by composite thermo-pressure system of the overpressure， normal-pressure， and underpressure types， with the overpressure interval predominantly found in the 3^rd and 4^th members of the Shahejie Formation （also referred to as the Sha 3 Member and the Sha 4 Member， respectively） within the sub-sag zone， at depths ranging from 2 500 to 4 000 m approximately. The overpressure in the area primarily results from undercompaction， followed by a combination of hydrocarbon generation-induced pressurization， diagenesis， and tectonic compression. There exist two major hydrocarbon migration and accumulation modes in the study area： the self-sourced indigenous mode within overpressure zones and the cross-pressure mode from an overpressure zone to a normal-pressure/underpressure zone. The former is predominantly found within the overpressure zones of the Sha 3 and 4 members in the sub-sag zone. In contrast， the latter occurred during the period of faulting， including overpressure-driven hydrocarbon charging into the Leijia and Gaosheng structural zones from source rocks in the Sha 4 Member in the Chenjia sub-sag， and hydrocarbon accumulation in the eastern steep slope area and Xinglongtai buried hill in the Lengjia area after transporting through faults and sand bodies from the overpressure zones in the lower to middle sub-members of the Sha 3 Member.

Key words: overpressure, genetic mechanism, accumulation mode, moderately deep to deep strata, Lengjia-Leijia area, Liaohe Depression

CLC Number:

TE122.3

Chang CHEN, Nansheng QIU, Rongjin GAO, Xiaolong ZHOU, Yonghe SUN, Linlin YANG, Jian FU. Overpressure in moderately deep to deep strata in the Lengjia-Leijia area， western Liaohe Depression， Bohai Bay Basin： Origin and effects on hydrocarbon accumulation[J]. Oil & Gas Geology, 2024, 45(1): 130-141.

Figures/Tables 11

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Overpressure in moderately deep to deep strata in the Lengjia-Leijia area， western Liaohe Depression， Bohai Bay Basin： Origin and effects on hydrocarbon accumulation

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