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Origin and Distribution of Hydrogen Sulfide in Oil‐Bearing Basins, China
Author(s) -
Guangyou ZHU,
Shuichang ZHANG,
Yingbo LIANG
Publication year - 2009
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2009.00139.x
Subject(s) - structural basin , geology , carbonate , bay , geochemistry , tarim basin , hydrogen sulfide , sulfate , petroleum , sulfide , sichuan basin , sulfur , geomorphology , paleontology , oceanography , chemistry , organic chemistry
The concentration of hydrogen sulfide gas (H 2 S) varies greatly in the oil‐bearing basins of China, from zero to 90%. At present, oil and gas reservoirs with high H 2 S concentration have been discovered in three basins, viz. the Bohai Bay Basin, Sichuan Basin and the Tarim Basin, whereas natural gas with low H 2 S concentration has been found in the Ordos Basin, the Songliao Basin and the Junggar Basin. Studies suggest that in China H 2 S origin types are very complex. In the carbonate reservoir of the Sichuan Basin, the Ordos Basin and the Tarim Basin, as well as the carbonate‐dominated reservoir in the Luojia area of the Jiyang depression in the Bohai Bay Basin, Wumaying areas of the Huanghua depression, and Zhaolanzhuang areas of the Jizhong depression, the H 2 S is of Thermochemical Sulfate Reduction (TSR) origin. The H 2 S is of Bacterial Sulphate Reduction (BSR) origin deduced from the waterflooding operation in the Changheng Oilfield (placanticline oil fields) in the Songliao Basin. H 2 S originates from thermal decomposition of sulfur‐bearing crude oil in the heavy oil area in the Junggar Basin and in the Liaohe heavy oil steam pilot area in the western depression of the Bohai Bay Basin. The origin types are most complex, including TSR and thermal decomposition of sulfcompounds among other combinations of causes. Various methods have been tried to identify the origin mechanism and to predict the distribution of H 2 S. The origin identification methods for H 2 S mainly comprise sulfur and carbon isotopes, reservoir petrology, particular biomarkers, and petroleum geology integrated technologies; using a combination of these applications can allow the accurate identification of the origins of H 2 S. The prediction technologies for primary and secondary origin of H 2 S have been set up separately.