Natural Gas Geoscience ›› 2010, Vol. 21 ›› Issue (5): 705-714.doi: 10.11764/j.issn.1672-1926.2010.05.705

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Distribution Characteristics of Hydrogen Sulphide-bearing Gas Pools and the Genesis of Hydrogen Sulphide in Sichuan Basin

HUANG Shi-peng, LIAO Feng-Rong, WU Xiao-qi, TAO Xiao-Wan   

  1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
  • Received:2010-07-15 Revised:2010-08-30 Online:2010-10-10 Published:2010-10-10

Abstract:

At present, Sichuan basin is a petroliferous basin which has the biggest number of H2S-bearing gas reservoirs and of which the H2S-bearing gas reserves is also the biggest in China. Reservoirs producingH2S-bearing natural gas are distributed in Sinian, Carboniferous, Permian, and Triassic. Transversely, the East Gas District(EGD) has the highest content of H2S, followed by the West Gas District(WGD) and the Middle Oil-Gas District(MOGD), and the South Gas District(SGD) has the least. Vertically, the content of H2S is various among the different reservoirs and even in different members of the same strata or well. TheH2Scontent of natural gas in Triassic Feixianguan Formation is the highest, followed by those in the Permian Changxing Formation and in the Triassic Leikoupo Formation, and that in the Permian Maokou Formation is the least. The differences of the H2S content among different wells in the Sinian Dengying Formation are slight, and the similar phenomenon also exists in Carboniferous Huanglong Formation. SignificantH2S content differences have been observed in the natural gas from different members of Jialingjiang Formation, in which the gas from the fifth and the forth members have the highest H2S content. According to the comprehensive analysis of the sedimentary facies, burial history, thermal history, homogenization temperature of the fluid inclusions, as well as the sulfur isotope ratios and the components of the natural gas, it can be concluded that theH2S of the Feixianguan Formation and the Changxing Formation in EGD, the Jialingjiang Formation(except the first member) in EGD and SGD, the Dengying Formation gas pool of Weiyuan gas reservoir in SGD, the Leikoupo Formation gas pool of Zhongba gas reservoir in WGD and the Leikoupo Formation gas pool of the Moxi gas reservoir in MOGD were generated by the thermochemical sulfate reduction(TSR), while that in the Huanglong Formation in EGD and the Maokou Formation in SGD were generated by the cracking of the organic matter(kerogen or oil ) which contains sulfur.

Key words: Hydrogen sulphide, Gas pool, Distribution characteristics, Genesis, Sichuan basin.

CLC Number: 

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