Analysis of hydrocarbon accumulation conditions of double-layered Archaeozoic buried hill and major discovery of Bozhong 13-2 Oil and Gasfield, Bohai sea area#br#

doi:10.3969/j.issn.1672-7703.2021.02.002

Abstract

Abstract: Buried hill has become an important field for oil and gas exploration in sea areas of China and the depth of exploration is extended to greater than 3500 m. After the major discovery of Bozhong 19-6 Gasfield in Archaeozoic single-layer metamorphic buried hill, hydrocarbon accumulation potential of buried hill with multi-layered structures is another geological problem to be clarified urgently. Regional geological and tectonic evolution have been studied and hydrocarbon accumulation conditions analyzed
by well, seismic and geochemical data. The result shows that the development of buried hill and reservoir is controlled by
regional tectonic activities and their induced fracturing. The discovery of Bozhong 13-2 Oil and Gasfield (proven geological reserves
of 100 million tons of oil equivalent) confirms that the Archaeozoic multi-layered metamorphic granite buried hill has excellent
hydrocarbon accumulation conditions. Further analysis on accumulation elements of Bozhong 13-2 Oil and Gasfield and
comparison with those of Bozhong 19-6 Gasfield indicate that the multi-stage stereoscopic fracture network and effective connection with hydrocarbon supply window are the key to reservoir development and hydrocarbon accumulation in buried hill. The “short-axis discontinuous reflection” associated with fault is a marker of Archaeozoic high-quality buried hill reservoir. The combination of overpressure and wide hydrocarbon supply window, and multivariate migration pathway promotes the accumulation in double-layered buried hill, and the well-connected cavity-fractured system provides sufficient space for hydrocarbon migration and accumulation inside the buried hill. In conclusion, oil and gas discovery in Bozhong 13-2 double-layered buried hill confirms the validity of exploration in non-sedimentary buried hill dominated by fractured reservoirs, which has great significance to buried hill exploration in China sea area.

CLC Number:

TE122

Shi Hesheng, Niu Chengmin, Hou Mingcai, Gao Yangdong, Lai Weicheng, Chen Anqing, Xu Guosheng, Xu Peng, Cao Haiyang, Yan Jianguo. Analysis of hydrocarbon accumulation conditions of double-layered Archaeozoic buried hill and major discovery of Bozhong 13-2 Oil and Gasfield, Bohai sea area#br#[J]. China Petroleum Exploration, 2021, 26(2): 12-20.

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