Study on Developmental Characteristics of Coastal Fault in Beidagang Buried Hill and Its Coupling with the Upper Paleozoic Secondary Hydrocarbon Formation

doi:10.3969/j.issn.1006-6535.2022.01.008

Abstract

Abstract: The formation and evolution of faults are greatly significant for hydrocarbon accumulation. In order to ascertain the control of the coastal faults in the Beidagang buried hills on the hydrocarbon generation and accumulation of upper Paleozoic source rocks, based on a large amount of seismic data and bottom structure drawings of various periods, the development characteristics of the coastal fault was characterized in detail. Combined with the hydrocarbon generation and evolution of the source rocks, the matching relationship was analyzed for hydrocarbon accumulation. The results of the study showed that the eastern section of the coastal fault was the most strong in development, the middle section was slightly weaker, and the western section was the weakest; the eastern section was developed with a large number of flower-like assemblages, and dominated by hydrocarbon accumulation on traction anticline; the middle section was developed with domino-type assemblages, and dominated by hydrocarbon accumulation on fault-black and fault-nose; in the Es₃ period, the fault activity was the strongest, and the center of activity was located in the middle section, with an average vertical activity rate of 227.5 m/Ma; the fault activity in the Ed period was weaker, the center of activity was located in the east section, with an average vertical activity rate of 7.0 m/Ma; the Ed period was the key period of secondary hydrocarbon generation and accumulation of the Carboniferous-Permian source rocks in Beidagang Buried Hill, and the accumulation elements were matched with each other. The middle section of Beidagang Buried Hill was a favorable area for hydrocarbon accumulation, as well as the key area for further exploration and development. The results of the study can be used as a reference for in-depth exploration of the Carboniferous-Permian primary oil-gas reservoirs in Beidagang Buried Hill.

Key words: coupling with hydrocarbon formation, fault development characteristics, secondary hydrocarbon generation, coastal fault, Beidagang Buried Hill

CLC Number:

TE122

Li Jianhong, Wang Yanbin, Miao Huan, Zhang Yujian, Gong Xun, Xiong Xing. Study on Developmental Characteristics of Coastal Fault in Beidagang Buried Hill and Its Coupling with the Upper Paleozoic Secondary Hydrocarbon Formation[J]. Special Oil & Gas Reservoirs, 2022, 29(1): 52-58.

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