Control of Neotectonic movements on the ultimate hydrocarbon accumulation in shallow formations in bulge and slope-subsag areas in Bohai Sea

doi:10.3969/j.issn.1672-7703.2024.01.007

Abstract

Abstract: The shallow Neogene Guantao-Minghuazhen Formations are the main hydrocarbon-bearing series in Bohai Sea. The Neotectonic movements in the late Cenozoic were the most profound tectonic events in Bohai Sea, which had much greater influence on hydrocarbon accumulation in shallow formations than that in deep formations, and controlled the ultimate hydrocarbon accumulation in shallow formations. The study results show that the Neotectonic movements resulted in the rapid hydrocarbon generation and expulsion in the late sag subsidence period, development of various types of traps, and active hydrocarbon migration, which adjusted and controlled the ultimate hydrocarbon accumulation and determined the distribution of shallow oil and gas reservoirs in Bohai Sea. However, the control effect of the Neotectonic movements on hydrocarbon accumulation in shallow formations varied in various structural belts. Based on the structural position and hydrocarbon accumulation characteristics, shallow oil and gas reservoirs are classified into two major categories, i.e., shallow oil and gas reservoirs in bulge area, and shallow oil and gas reservoirs in the slope-subsag area. By analyzing hydrocarbon accumulation characteristics of shallow oil and gas reservoirs in these two structural belts, the control effect of the Neotectonic movements on the ultimate hydrocarbon accumulation and enrichment patterns of shallow oil and gas reservoirs in different structural belts are identified, and the corresponding hydrocarbon accumulation patterns are established. Among them, the hydrocarbon accumulation in shallow bulge area is characterized by a “stepped” pattern controlled by “late fault connecting source rock + stable shallow reservoir-cap rock combination”. The hydrocarbon accumulation in shallow slope-subsag area shows “inverted funnel” pattern controlled by “uplift in subsag + late fault” and “deep ridge for gas migration + late fault”. At present, the exploration target in shallow formations in Bohai Sea is dominated by lithologic oil and gas reservoir, and the exploration should be focused on “late fault for gas migration + lithologic trap” combination controlled by the Neotectonic movements.

CLC Number:

TE121

Mi Lijun, Xu Jianyong, Liu Zhifeng, Zhu Wenqi, Wu Bin. Control of Neotectonic movements on the ultimate hydrocarbon accumulation in shallow formations in bulge and slope-subsag areas in Bohai Sea[J]. China Petroleum Exploration, 2024, 29(1): 92-105.

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