岩性油气藏 ›› 2023, Vol. 35 ›› Issue (5): 62–70.doi: 10.12108/yxyqc.20230506

• 地质勘探 • 上一篇    下一篇

四川盆地米仓山前缘旺苍地区下寒武统筇竹寺组裂缝脉体发育特征及意义

魏全超1, 李小佳2, 李峰2, 郝景宇1, 邓双林2, 吴娟2, 邓宾2, 王道军1   

  1. 1. 中国石化勘探分公司, 成都 610059;
    2. 成都理工大学 油气藏地质及开发工程国家重点实验室, 成都 610059
  • 收稿日期:2022-10-25 修回日期:2022-11-13 出版日期:2023-09-01 发布日期:2023-09-28
  • 第一作者:魏全超（1981—），男，高级工程师，主要从事页岩气保存研究。地址：（610059）四川省成都市成华区二仙桥东三路1号成都理工大学。Email：weiqc.ktnf@sinopec.com。
  • 通信作者: 李小佳（1996—），男，硕士，主要从事油气成藏研究。Email：596897248@qq.com。
  • 基金资助:
    中国石油化工股份有限公司重点科技项目 “四川盆地及周缘油气富集规律与分布预测”（编号： P20059） 资助。

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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摘要： 通过薄片观察、流体包裹体分析、岩石地球化学测试以及盆地数值模拟等，对四川盆地米仓山前缘旺苍地区下寒武统筇竹寺组脉体发育特征进行了研究，并判别了沉积期的流体活动期次和流体性质。研究结果表明： ①旺苍地区筇竹寺组发育2期方解石脉体和1期石英脉体，石英脉体的形成晚于方解石脉体，第一期方解石脉体形成于早志留世，成脉流体主要为层内地层水，受少量大气淡水和海水影响，与液态烃类流体一起充注，均一温度为83.1～136.2℃，盐度为0.4%～12.2%；第二期方解石脉体形成于早侏罗世，成脉流体为层内地层水，与液态烃类和高密度气相甲烷混合充注，均一温度为140.2～185.4℃，盐度为5.7%～17.3%；石英脉体形成于早白垩世，成脉流体为筇竹寺组硅质流体，与高密度气相甲烷一起充注，均一温度为162.1℃，盐度为13.8%。②研究区筇竹寺组方解石脉体样品的δ18OPDB值为-14.95‰～-9.17‰，绝大部分方解石脉体实测δ18OPDB值均小于早寒武世全球海水的平均值，其负偏移特征受控于成脉流体温度和δ18O丰度。方解石脉体和围岩中稀土元素富集，二者均具有Eu正异常和Ce无异常，流体来源于层内地层水。③研究区筇竹寺组受外源流体影响较小，节理和裂缝发育，并不沟通上下地层，有利于山前带筇竹寺组页岩气的聚集与封闭保存。

关键词: 页岩气, 方解石脉体, 石英脉体, 流体活动, 流体包裹体, 封闭条件, 筇竹寺组, 下寒武统, 旺苍地区, 米仓山前缘, 四川盆地

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

中图分类号: 

  • TE122.2
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