New recognition of hydrocarbon accumulation and enrichment and discovery of large-scale oil and gas fields in Bohai Sea area, Bohai Bay Basin

doi:10.3969/j.issn.1672-7703.2025.01.005

Abstract

Abstract: In response to the challenges of almost all large-sized structural traps being discovered and insufficient resource replacement of production oil fields in Bohai Bay Basin. In the past 20 years, the continuous research has been conducted in exploration fields of the shallow Neogene and deep buried hills by using abundant geological, well drilling, laboratory test and seismic data, forming new geological understanding of hydrocarbon accumulation controlled by “convergence ridge” and “gas generation in lake basin”, respectively. The core of hydrocarbon accumulation controlled by “convergence ridge” includes that: (1) The configuration between “convergence ridge” and fault controlled the differential hydrocarbon enrichment outside source rock; (2) The “dendritic” type large-scale lithologic traps were developed in shallow loose sandstone; (3) The concealed faults controlled by weak tectonic activity enabled to form large-scale “concealed” traps. The main connotation of “gas generation in lake basin” refers to: (1) The late rapid subsidence of Bozhong Sag caused explosive gas generation of Shahejie Formation source rock; (2) The tectonic stress controlled the development of double-layer stereoscopic reservoirs in the Archeozoic granite buried hills; (3) The rapid and high-intensity charging of early oil and late gas and dynamic accumulation occurred under the background of overpressure dynamic sealing. The above understanding has guided the discovery of 18 large and medium-sized high-yield oil and gas fields such as KL10-2 and BZ19-6, which not only facilitates the strategic shift of oil exploration towards hidden oil reservoirs in Bohai Sea area, but also achieves the strategic breakthrough in large gas fields in oil-type basin.

Key words: Bohai Bay Basin, Bohai Sea area, convergence ridge, gas generation in lake basin, large oil and gas field, exploration orientation

CLC Number:

TE111.1

Xue Yong’an, Yang Haifeng, Huang Zhi, Xu Chunqiang, Xu Peng, Li Long. New recognition of hydrocarbon accumulation and enrichment and discovery of large-scale oil and gas fields in Bohai Sea area, Bohai Bay Basin[J]. China Petroleum Exploration, 2025, 30(1): 56-67.

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