Tectonic compression controls the vertical property variation of sandstone reservoir:An example of Cretaceous Bashijiqike Formation in Kuqa foreland thrust belt,Tarim Basin

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  • 1.College of Geosciences,China University of Petroleum,Beijing 102249,China;
    2.Exploration and Development Research Institute of PetroChina Tarim Oilfield Company,Korla 841000,China;
    3.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China

Received date: 2015-05-25

  Revised date: 2015-07-28

  Online published: 2019-09-20

Abstract

Various data including well logging,cores,thin sections,porosity and permeability were used to analyze the vertical variation of Bashijiqike sandstone reservoir in Kuqa foreland thrust belt.The Bashijiqike reservoir property becomes obviously worse from up to down.The relationship between tectonic stress,diagenesis,and pore development showed,the local tensile stress turned into torsional stress and the tectonic stress size gradually increased from up to down under the tectonic compression.Tension fissures with large fracture opening width are developed,whereas,fracture number decreases and shear fissures with small fracture opening width relatively increase down to the lower Bashijiqike Formation.Compaction enhances and dissolution decreases with the increase of tectonic stress size and development of fewer fractures,the reduced porosity by compaction and enhanced porosity by dissolution are approximately 2%-3% and 1%-2% respectively.So,the vertical difference is primarily determined by tectonic compression.The results help to further understand the diagenesis,and predict favorable reservoir distribution in compressional basins.

Cite this article

Yang Xian-zhang, Mao Ya-kun, Zhong Da-kang, Li Yong, Neng Yuan, Sun Hai-tao, Liu Yun-long . Tectonic compression controls the vertical property variation of sandstone reservoir:An example of Cretaceous Bashijiqike Formation in Kuqa foreland thrust belt,Tarim Basin[J]. Natural Gas Geoscience, 2016 , 27(4) : 591 -599 . DOI: 10.11764/j.issn.1672-1926.2016.04.0591

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