Migration and accumulation impetus and two-dimension visual physical simulationresearch of coal-measure tight sandstone gas: A case study from tight sandstone gas in the Upper Triassic Xujiahe Formation,central Sichuan Basin,China

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  • 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.Research Institute of Oil-gas Exploration and Development Attached to Southwest Oil-gas Field Company,
    PetroChina,Suining 629000,China;3.China University of Petroleum,Beijing 102249,China

Received date: 2016-03-31

  Revised date: 2016-06-19

  Online published: 2019-09-09

Abstract

Tight sandstone gas derived from coal-measure source rocks is a major type of gases in China continental basin,which is typically characterized by the Xujiahe Formation of the Sichuan Basin and Upper Paleozoic strata of the Ordos Basin.Coal-measure source rocks expelled hydrocarbon evaporatively.Under the setting of gentle structure,the gas migration-accumulation in tight sandstone is featured by restricted hydrodynamic and buoyance.Hydrocarbon source rock of a wide range of planar evaporative hydrocarbon expulsion,the lower tectonic background,the tight sandbody in the process of gas migration accumulation,heterogeneity of sandbodies control the formation of local enrichment and dessert of tight sandstone gas.The two-dimensional simulation experiment reveals that the range of sand permeability controls the efficiency,speed and gas saturation of the gas migration-accumulation.When the range is 2.8 (the sand heterogeneity is weak),gas in sandstone is characterized by migration and dispersion rather than accumulation; as the heterogeneity becomes obvious and the value increases to 5.4,gas accumulation would be triggered; when the range further increases to more than 9,effective gas accumulation occurs in large-scale.When there is adequate gas,the sands with good reservoir property is featured by high gas saturation.Moreover,connected fault enables faster speed of accumulation.In general,the migration-accumulation mechanisms in tight sandstone gas indicate that,exploration should be focused on sands with good reservoir properties within distributary channel,dissolved cuttings,fault fissure,and local structure.The sands periphery is surrounded by sandstone or mudstone with poor reservoir properties,which thus benefits the gas accumulation and preservation.

Cite this article

Tao Shi-zhen, Li Chang-wei, Huang Chun-hu, Zeng Jian-hui, Zhang Xiang-xiang, Yang Chun, Gao Xiao-hui, Gong Yan-jie . Migration and accumulation impetus and two-dimension visual physical simulationresearch of coal-measure tight sandstone gas: A case study from tight sandstone gas in the Upper Triassic Xujiahe Formation,central Sichuan Basin,China[J]. Natural Gas Geoscience, 2016 , 27(10) : 1767 -1777 . DOI: 10.11764/j.issn.1672-1926.2016.10.1767

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