Development mechanism of fracture pores in marine shale and its geological significance

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  • Research Institute of Petroleum Exploration & Development,PetroChina, Beijing 100083, China

Received date: 2016-04-16

  Revised date: 2016-06-02

  Online published: 2019-09-10

Abstract

Formation mechanism of natural fracture is fundamental to the research of shale gas concentration mechanism and "sweet spot" selection.This paper studied the characteristics and formation mechanism of natural fracture in black shale based on six large domestic and foreign gas fields,and the results showed that there are at least three kinds of mechanisms for the natural fracture in marine shale:Foreland thrust-fold and detachment-deformation of shale bed,late-stage tectonic inversion and detachment-deformation of shale bed,as well as periodic movement of strike-slip fault.Foreland thrust-fold and decollement-deformation of shale bed,which is generally characterized by long time of horizontal shearing,large horizontal displacement and well-developed conjugated and micro-fracture,are very common in many forelands in Appalachian-Ouachita fold belt of North America platform.Late-stage tectonic inversion and decollement-deformation of shale bed are important fracture-mechanism in rift basins and superimposed basins,with the development degree of natural fracture depending on the intensity and scale of tectonic inversion.Periodic movement of strike-slip fault mainly exists in partial tectonic belt of a few basins with relatively limited fracture area.According to the formation mechanism of natural fracture in marine shale,two aspects of geological significance are emphasized:Fractured-reservoir forming from the decollement of shale bed is important “sweet spot” in shale gas development;tectonic conditions of marine shale in southern China are favorable for the formation of fractured shale gas reservoir,especially the Longmaxi Formation in Sichuan Basin with fractured-sweet spot and good exploration prospect.

Cite this article

Wang Yu-man, Li Xin-jing, Dong Da-zhong, Zhang Chen-chen, Wang Shu-fang, Huang Jin-liang, Guan Quan-zhong . Development mechanism of fracture pores in marine shale and its geological significance[J]. Natural Gas Geoscience, 2016 , 27(9) : 1602 -1610 . DOI: 10.11764/j.issn.1672-1926.2016.09.1602

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