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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2015  >  37(6): 742-750
Liu An, Wei Kai, Li Xubing, Wang Baozhong, Wang Qiang. Paleo-fluid characteristics and preservation of hydrocarbons in the Sangzhi-Shimen synclinorium and adjacent areas[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(6): 742-750. doi: 10.11781/sysydz201506742
Citation: Liu An, Wei Kai, Li Xubing, Wang Baozhong, Wang Qiang. Paleo-fluid characteristics and preservation of hydrocarbons in the Sangzhi-Shimen synclinorium and adjacent areas[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(6): 742-750. doi: 10.11781/sysydz201506742
shu

Paleo-fluid characteristics and preservation of hydrocarbons in the Sangzhi-Shimen synclinorium and adjacent areas

doi: 10.11781/sysydz201506742

  • Wuhan Institute of Geology and Mineral Resources, China Geology Survey, Wuhan, Hubei 430205, China

  • Received Date: 2014-08-29
  • Rev Recd Date: 2015-09-08
  • Publish Date: 2015-11-28
    Abstract
  • The paleo-fluid characteristics and hydrocarbon preservation in the Sangzhi-Shimen synclinorium and adjacent areas are discussed using comparisons of C, O, and Sr isotopes between the calcite veins and surrounding rocks in the Sinian and Triassic formations and combined with the tests of fluid inclusions in calcite veins. The 87Sr/86Sr values of surrounding rocks in the Lower Paleozoic are higher than those of contemporary seawater and calcite veins, which suggests that the surrounding rocks had been reformed by fluid with high 87Sr/86Sr values before fracturing. The calcite veins close to thermal springs in the north of Sangzhi-Shimen synclinorium have high 87Sr/86Sr values, low δ13C and low δ18O values, which can be explained by the mixing of meteoric water during calcite vein deposition and suggests that reverse faults might have been open when they were formed. The salinity and homogenization temperature of fluid inclusions shows that the residual cap formations above the Upper Cambrian Loushanguan Formation are less than 3 km thick with poor sealing capacity. The high salinity of calcite inclusions in the Middle Cambrian Kongwangxi Formation showed that gypsum salt cap layers are distributed widely in the study area, and the gypsum salt layers buried over 2 km deep have excellent sealing capacity. The preservation conditions of the Tianerya, Xiangjiaya, Chefang anticline traps, and the Qiaotou, Zhongping buried structural traps are favorable. The dolomites in the Sinian Dengying Formation and Cambrian Qingxudong Formation are exploration targets except for those in the Tianerya anticline.

     

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