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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2016  >  38(3): 311-319
Jiang Wenjian, Hou Mingcai, Xing Fengcun, Xu Shenglin, Ling Liangbiao. Diagenetic characteristics of dolomites in the Cambrian Loushanguan Group in southeastern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(3): 311-319. doi: 10.11781/sysydz201603311
Citation: Jiang Wenjian, Hou Mingcai, Xing Fengcun, Xu Shenglin, Ling Liangbiao. Diagenetic characteristics of dolomites in the Cambrian Loushanguan Group in southeastern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(3): 311-319. doi: 10.11781/sysydz201603311
shu

Diagenetic characteristics of dolomites in the Cambrian Loushanguan Group in southeastern Sichuan Basin

doi: 10.11781/sysydz201603311
  • 1.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • Received Date: 2015-07-01
  • Rev Recd Date: 2016-04-08
  • Publish Date: 2016-05-28
    Abstract
  • Based on the comprehensive studies of petrology, carbon and oxygen isotopes, and cathodoluminescence characteristics, it has been shown that dolomites from the Jingzhu and Zhongba outcrop sections of the Cambrian Loushanguan Group have experienced multiple diagenetic effects such as dolomitization, dissolution, cementation and silicification. There are four types of dolomite: penecontemporaneous, seepage refluxing, buried, and hydrothermal. Four diagenetic stages were divided into penecontemporaneous, early, late and epidiagenetic. The influencing factors of diagenetic evolution and pore development were analyzed. Diagenetic evolution was mainly affected by the sedimentary environment, the original structure of sediments and sedimentary cycles. Micrite dolomites formed in tidal flat and lagoon environments have a poor original porosity, and the late diagenetic fluid alteration was weak. Grain dolomites and crystalline dolomites formed in a beach environment have lots of primary pores, and their porosity was further improved by late diagenetic fluid alteration. As a result, they are more favorable reservoirs for oil and gas.

     

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