Differential Karstification Analysis of the Sinian Dengying Formation in Northern Sichuan

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  • 1.College of geosciences of China University of Petroleum,Beijing 102249,China;2.State Key Laboratory of
    Petroleum Resources and Prospecting,China University of Petroleum,Beijing  102249,China;3.Laboratory of
    Sedimentary Structural Reservoir,Petroleum Exploration and Product Research Institute,SINOPEC,Beijing 100083,
    China;4.Research Institute of Exploration and Development,Tarim Oilfield Company,CNPC,Korla 841000,China

Received date: 2015-02-16

  Revised date: 2015-06-08

  Online published: 2015-11-10

Abstract

The Dengying Formation in the Sichuan Basin is mainly a set of carbonate sediments,in which the high quality reservoir development is generally controlled by karst effects.In the Early Paleozoic,Micangshan area of northern Sichuan was an exposed land which was relatively stable,and it had good correlation with paleo-uplift of central Sichuan in the Tongwan Period.In this paper,through the analysis of carbon and oxygen isotopic characteristics in the key sections and microscopic observation,we systematically compared the unconformity karst features between the 2nd and 4th members of Dengying Formation.The 2nd member reservoir is characterized by  grape-like dolomite which develops bedding,interspersed corrosion caves and fractures,while the 4thmember develops sugar-like dolomite intercrystal pores,algae laminae dolomite acicular dissolved pores and breccia pores.Compared with the former,the 4th member of Dengying Formation has more reservoir space types and they are more developed.Furthermore,carbon and oxygen isotopes near the unconformity of the two layers have a tendency to get lighter from bottom to top,and carbon and oxygen isotope value of the 4th member of Dengying Formation is overall lower than that in the second member,as well as more negative in the vertical distribution.Based on the characteristics above,we can summary that compared to the first period of Tongwan Movements,the second period of tectonic uplift is more strong,leading to deeper supergene karst erosion effect in the 4th member of Dengying Formation.As a result,it reflects that the unconformity of Tongwan Movements plays an important role in controlling the development of Dengying Formation reservoir.

Cite this article

LI Bo-yuan,ZHANG Dian-wei,PANG Xiong-qi,,HU Fang-jie,ZHU Dong-ya,ZHANG Rong-qiang . Differential Karstification Analysis of the Sinian Dengying Formation in Northern Sichuan[J]. Natural Gas Geoscience, 2015 , 26(11) : 2075 -2084 . DOI: 10.11764/j.issn.1672-1926.2015.11.2075

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