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Occurrence and Origin of H2S from Volcanic Reservoirs in Niudong Area of the Santanghu Basin, NW China.
- Source :
- Geofluids; 6/2/2019, p1-10, 10p, 1 Color Photograph, 6 Charts, 4 Graphs
- Publication Year :
- 2019
-
Abstract
- A series of samples including natural gas, formation water, and rocks were collected from volcanic rock reservoirs in the Niudong area of the Santanghu Oilfields and analyzed for their mineral and/or chemical compositions and sulfur and carbon isotopes in order to investigate the occurrence and origin of hydrogen sulfide (H<subscript>2</subscript>S). H<subscript>2</subscript>S was mostly dissolved in the formation water along with petroleum production in the study area. The δ<superscript>34</superscript>S values of on-well H<subscript>2</subscript>S samples varied in a range of 9.2‰ to 20.5‰, probably indicating thermochemical sulfate reduction (TSR) and/or thermal decomposition of organic sulfur-bearing compounds (TDS) as the genetic process for H<subscript>2</subscript>S. However, the chemical composition of formation waters from the Kalagang Formation (C<subscript>2</subscript>k) and their coefficient of desulfurization also revealed that TSR could be the main principle for H<subscript>2</subscript>S formation. Considering the regional geological background, especially the tectonic structures and thermal evolution features of the basin, it was concluded that H<subscript>2</subscript>S in the study area was dominantly produced by thermal genesis with TSR as a domain through interactions between hydrocarbons and aqueous sulfate dissolved from sulfate minerals. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14688115
- Database :
- Complementary Index
- Journal :
- Geofluids
- Publication Type :
- Academic Journal
- Accession number :
- 136764709
- Full Text :
- https://doi.org/10.1155/2019/1279658