Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 76-85.doi: 10.12108/yxyqc.20200108

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Genesis of authigenic chlorite in tight oil reservoirs and its influence on physical properties: a case study of Shaximiao Formation in NE of central Sichuan Basin

WU Jiayang1, LYU Zhengxiang1,2, QING Yuanhua1,3, YANG Jiajing4, JIN Tao4   

  1. 1. College of Energy Resource, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    3. Exploration Department, PetroChina Tarim Oilfield Company, Korla 836000, Xinjiang, China;
    4. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China
  • Received:2019-07-10 Revised:2019-08-05 Online:2020-01-21 Published:2019-11-22

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Abstract: In order to study the occurrence,genesis and influence of authigenic chlorite in the tight oil reservoirs of Middle Jurassic Shaximiao Formation in NE of central Sichuan Basin,the experimental data such as polarized microscopic slice,mineral X-ray diffraction,electron probe and scanning electron microscopy were used to systematically analyze the authigenic chlorite. The results show that the authigenic chlorites in the study area are iron-magnesium transitional chlorites rich in iron. The granular-coated chlorite was formed in the syngenetic-early diagenetic A stage,the pore liner was the main occurrence of chlorite,which was formed in the early diagenetic A stage,and the pore-filled chlorite was mainly formed in the middle diagenetic A2 stage. The Fe and Mg required for the formation of authigenic chlorite were derived from hydration hydrolysis and dissolution of magmatic rock cuttings and biotite,and Fe and Mg ions adsorbed by the clay mineral conversion release layer in mudstone adjacent to the stratum. There are three kinds of formation mechanism of chlorite:(1)in the syngenetic-early diagenetic A stage,symbiotic hydration hydrolysis of silicate minerals and montmorillonite conversion to chlorite in Fe and Mg fluids; (2)in the early diagenetic A stage,the conversion of montmorillonite to illite in adjacent mudstones provided sufficient Fe and Mg ions; (3)in the middle diagenetic A2 stage,it was related to the dissolution of silicate minerals by carbonic acid formed by decarboxylation of organic acids and the conversion of kaolinite(or illite)to chlorite. The chlorite liner can improve the compressive strength of sandstone and facilitate the preservation of pores and throat. The chlorite liner with suitable thickness(> 7 μm)can effectively inhibit the secondary expansion and filling of the quartz. The reservoir with chlorite liner developed is conducive to the preservation of primary pores,enabling pore water to react further with the surrounding rock particles to ensure the dissolution of the later stage. Therefore,chlorite liners play an important role in the formation of tight oil reservoirs in the study area.

Key words: tight oil, authigenic chlorite, reservoir physical properties, Shaximiao Formation, Jurassic, Sichuan Basin

CLC Number: 

  • TE122.2
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