The shallow accumulation law of natural gas in the Lanjia-Helong-Buhai area and its exploration signifcance

doi:10.3969/j.issn.1672-7703.2018.03.010

Abstract

Abstract: The fault and depression structures in the Lanjia-Helong-Buhai area is very complex and have not been understood comprehensively and regularly in their regional structures and gas reservoir properties for a long time. In order to reveal the relationship between the shallow gas reservoir and the deep hydrocarbon source rock in the Lanjia-Helong-Buhai area, the tectonic analysis theory for gas provinces was used to analyze the basin patterns, tectonic units, and fault evolution characteristics in the fault-depression-reversion stage, and based on which a shallow gas migration and accumulation model was built by incorporating the effects of tectonic reversal on deep faults and stratigraphic sedimentation. The results show that the continuously faulted and the sedimentarily inherited basin patterns had a stable sedimentary environment with regional tectonic subsidence and good source-reservoir-cap rocks assemblages, while the superimposedly inverted basin pattern developed deep faults, unconformities and interlayer detachments, which further communicate the shallow reservoir with the deep source rock, forming a model characterized by "deep hydrocarbon generation-vertical migration-favorable shallow reservoir accumulation". Finally, the main gas transport systems and reservoir types were revealed, and the risk-taking and favorable exploration areas were clearly identifed in different tectonic belts.

Key words: shallow reservoir, reversion, fault, transport system, accumulation model

CLC Number:

Hao Meng, Hu Wangshui, Li Tao, Yu Zhenyu, Guo Xiantao. The shallow accumulation law of natural gas in the Lanjia-Helong-Buhai area and its exploration signifcance[J]. China Petroleum Exploration, 2018, 23(3): 81-89.

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