Tectonic Evolution of the Leshan-Longnvsi Paleo-uplift and Reservoir Formation of Neoproterozoic Sinian Gas

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  • 1.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;
    2.CNOOC Research Institute,Beijing 100027,China;
    3.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,
    Chinese Academy of Sciences,Lanzhou 730000,China

Received date: 2013-03-25

  Revised date: 2013-05-10

  Online published: 2014-02-10

Abstract

Taking Dengying Formation of Neoproterozoic Sinian of Leshan-Longnvsi paleo-uplift as a target,relationship between the evolution of paleo-uplift and hydrocarbon accumulation has been studied.It has undergone several periods of tectonic movements during the Leshan-Longnvsi paleo-uplift:Tongwan movement,including episode I and episode Ⅱ,controlling the development of paleo-karsting;Caledonian movement,controlling the formation of embryonic paleo-uplift;Hercynian movement,Indo-China movement and Yanshanian movement,controlling the oil and gas reservoir process.During these periods,paleo-uplift generally inherently developed,while paleo-uplift axis continuously migrated from northwest to southeastward and finally set in Himalayan.Based on the researches on fluid inclusions and burial history,it was recognized that there were three key generation or expulsion periods,i.e.,Silurian,early Triassic and Jurassic-Cretaceous sedimentary stages,respectively.There were seven periods during the Sinian Dengying Formation: initial charge,hydrocarbon stagnation,secondary charge,formation,migration and cracking of paleo-oil reservoir,and formation of gas reservoir.Combined numerical simulation with oil and gas exploration,gas reservoir modeling of Dengying Formation in Sinian was established.Gas reservoir group were distributed as a cluster block in the slope of paleo-uplift where Well Gaoshi1 existed.They showed as layered distribution in plane.The slope of paleo-uplift was an important gas exploration area.And it was also recognized that petroleum system of neoproterozoic in China would play a significant role for oil prospecting.

Cite this article

JIANG Hua,WANG Ze-cheng,DU Hong-yu,ZHANG Chun-ming,WANG Rui-ju,ZOU Niu-niu,WANG Tong-shan,GU Zhi-dong,LI Yong-xin . Tectonic Evolution of the Leshan-Longnvsi Paleo-uplift and Reservoir Formation of Neoproterozoic Sinian Gas[J]. Natural Gas Geoscience, 2014 , 25(2) : 192 -200 . DOI: 10.11764/j.issn.1672-1926.2014.02.192

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