Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 62-70.doi: 10.12108/yxyqc.20230506

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Development characteristics and significance of fracture veins of Lower Cambrian Qiongzhusi Formation in Wangcang area at Micang Mountain front， Sichuan Basin

WEI Quanchao1, LI Xiaojia2, LI Feng2, HAO Jingyu1, DENG Shuanglin2, WU Juan2, DENG Bin2, WANG Daojun1   

  1. 1. Exploration Company of Sinopec, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
  • Received:2022-10-25 Revised:2022-11-13 Online:2023-09-01 Published:2023-09-28

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Abstract: Through thin section observation，fluid inclusion analysis，rock geochemical testing and basin numerical simulation，the development characteristics of veins of Lower Cambrian Qiongzhusi Formation in Wangcang area at Micang Mountain front，Sichuan Basin，were studied，and the fluid activity stages and fluid properties in the sedimentary period were distinguished. The results show that： （1）There are two stages of calcite veins and one stage of quartz veins developed in Qiongzhusi Formation in Wangcang area，and the quartz veins were formed later than the calcite veins. The first stage of calcite veins was formed in the Early Silurian，and the vein forming fluids were mainly inner formation water，which were affected by a small amount of atmospheric fresh water and seawater，and filled veins together with liquid hydrocarbon fluids. The homogenization temperature ranged from 83.1 ℃ to 136.2 ℃，and the salinity was 0.4%-12.2%. The second stage of calcite veins was formed in the Early Jurassic. The vein forming fluids were inner formation water，which filled calcite veins together with liquid hydrocarbon and high density methane in gas phase. The homogenization temperature ranged from 140.2 ℃ to 185.4 ℃， and the salinity was 5.7%-17.3%. The quartz veins were formed in the Early Cretaceous，and the vein forming fluids were siliceous fluids in Qiongzhusi Formation，which filled the quartz veins with methane. The homogenization temperature was 162.1 ℃，and the salinity was 13.8%.（2）The δ18OPDB values of calcite vein samples from Qiongzhusi Formation in the study area range from -14.95‰ to -9.17‰，and the measured average δ18OPDB value of most calcite veins is smaller than that of global seawater of the Early Cambrian. The negative migration characteristics are controlled by temperature and δ18O abundance of the vein forming fluids. Rare earth elements are enriched in calcite veins and wall rocks，both of which have Eu positive anomaly and Ce no anomaly，and the fluids came from inner formation water.（3）Qiongzhusi Formation in the study area was affected less by external fluids， and the development of joints and fractures did not connect with the upper and lower strata，which was conducive to the accumulation and closed preservation of shale gas in Qiongzhusi Formation in the piedmont zones.

Key words: shale gas, calcite vein, quartz vein, fluid activity, fluid inclusion, closed condition, Qiongzhusi Formation, Lower Cambrian, Wangcang area, Micang Mountain front, Sichuan Basin

CLC Number: 

  • TE122.2
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