Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (2): 141-151.doi: 10.12108/yxyqc.20220213

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Main controlling factors of Ordovician Wufeng-Silurian Longmaxi shale gas enrichment in Tiangongtang structure, southwestern margin of Sichuan Basin

ZHANG Menglin1, LI Guoqin1, HE Jia1, HENG De2   

  1. 1. Research Institute of Geological Exploration and Development, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 610051, China;
    2. Sichuan Changning Natural Gas Development Co., Ltd., PetroChina Southwest Oil & Gas Field Company, Chengdu 610000, China
  • Received:2021-11-13 Revised:2022-01-25 Online:2022-03-01 Published:2022-03-14

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Abstract: The data of seismic, drilling, logging and core analysis and test were comprehensively used to study the structure, deposition and basic reservoir geological characteristics of Ordovician Wufeng-Silurian Longmaxi Formation in Tiangongtang structure in southwestern margin of Sichuan Basin, and the main controlling factors of shale gas enrichment and accumulation model were discussed. The results show that:(1) The high-quality shale in Tiangongtang structure is mainly developed in O3w-S1l1-1. Type Ⅰ reservoir is mainly developed in S1l1-1-1-S1l1-1-3 layers, with a thickness of 0.8-17.0 m, and characterized by high TOC content, good gas-bearing property and highly brittle minerals.(2) Tiangongtang structure has experienced rapid subsidence, deep burial and a large amount of hydrocarbon expulsion before the Late Cretaceous, forming an early enriched overpressure shale gas reservoir. After the Late Cretaceous, it was uplifted and reformed in two phases, and the early enriched overpressure shale gas reservoir gradually transformed to high pressure-normal pressure shale gas reservoir.(3) The preservation conditions of Tiangongtang structure are affected by stratigraphic dip angle and Gong-1 fault, resulting in differential enrichment of shale gas in different structural zones.(4) Tiangongtang structure is an anticline structure-type accumulation model of "early deep burial promotes enrichment, later uplift adjusts enrichment, and preservation conditions control enrichment". The southwest tip of the structure is a potential favorable area for next shale gas exploration and development.

Key words: main controlling factors of enrichment, shale gas, Wufeng-Longmaxi Formation, Ordovician, Silurian, Tiangongtang structure, southwestern Sichuan Basin

CLC Number: 

  • TE122.1
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