Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (6): 1631-1641.doi: 10.13278/j.cnki.jjuese.201706103

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Sedimentary-Diagenetic Systems of Dolomite Reservoir in Changxing Formation in the Eastern Kaijiang-Liangping Intraplatform Trough

Zhang Bing1, Yang Kai1, Jia Xueli2, Zheng Rongcai3, Guo Qiang1, Wen Huaguo3   

  1. 1. College of Geophysics, Chengdu University of Technology, Chengdu 610059, China;
    2. Institute of Petroleum Exploration and Production, PetroChina Tuha Oilfield Company, Hami 839009, Xinjiang, China;
    3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
  • Received:2017-03-07 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Supported by Research Fund for Doctoral Program of Higher Education of China (20135122120011)

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Abstract: In order to guide the deployment of drilling in dolomite reservoir of Sichuan basin. Based on oil and gas drilling core observation and description, field profile measurement and sample collection, combined with microscopic thin section identification、X-ray diffraction、physical parameter and geochemical characteristics analysis, we studied the reservoir sedimentary-diagenetic system about the dolomites in Changxing Formation of the eastern inland sea trough in Kaijiang-Liangping. It is considered that the platform margin reef and platform marginal shoal are the most important reservoir facies belts, The main reservoir lithology is of grain dolomite, biological reef dolomite,and crystalline dolomite. The most effective reservoir spaces are intergranular solution pores, intercrystalline pores,and super solution pores. The composite reservoirs with holes and seams are the best reservoir type. Comprehensive analysis showed that the sedimentary diagenetic system of the Changxing Formation has a good coupling relationship with dolomite reservoir in time and space. The distribution of Changxing Formation dolomite reservoir is controlled by the platform margin reef and platform marginal shoal facies, and the contribution of different diagenetic system to reservoir is different. Among them, the formation sealing brine and mixed hot brine diagenetic system are the foundation and key for reservoir formation:the former is of Type Ⅲ pores with low porosity and low permeability, and the latter is of TypeⅡ pores with middle porosity and permeability. The structural hydrothermal diagenesis system has the biggest contribution to the reservoir, which can form high quality Type I reservoirs.

Key words: Kaijiang-Liangping intraplatform trough, Changxing Formation, dolomite, sedimentary facies, reservoirs types, sedimentary-diagenetic systems

CLC Number: 

  • P618.1
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