IGGCAS OpenIR  > 油气资源研究院重点实验室
Alteration of solid bitumen by hydrothermal heating and thermochemical sulfate reduction in the Ediacaran and Cambrian dolomite reservoirs in the Central Sichuan Basin, SW China
Zhang, Pengwei1,2; Liu, Guangdi1,2; Cai, Chunfang3,4,5; Li, Meijun1,2; Chen, Ruiqian1,2; Gao, Ping6; Xu, Chenlu4; Wan, Weichao1,2; Zhang, Yiying1,2; Jiang, Mengya1,2
2019-02-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume321Pages:277-302
AbstractSolid bitumen in reservoir rocks is an allochthonous organic matter formed from bitumen or liquid hydrocarbons by various alteration processes. In this study, two types of altered solid bitumen have been identified in both the Ediacaran Dengying and Cambrian Longwangmiao formations in the Central Sichuan Basin using petrographic, microthermometric, chemical, and isotopic data. The hydrothermally altered bitumen (type 1) is associated with the pore-filling saddle dolomite and quartz in which homogenization temperatures of some fluid inclusions are more than 10 degrees C higher than the maximum burial temperature of the Dengying Formation. It has various anisotropic textures with significantly high bireflectance values (R-bmax - R-bmin%) between 3.89% and 9.21%. Moreover, the hydrothermal alteration led to C-13-enrichment in the type 1 bitumen compared to the normally matured bitumen derived from the same source. On the other hand, the thermochemical sulfate reduction (TSR)altered bitumen (type 2) has S/C atomic ratios of up to approximately 0.06. The delta(34)s values of type 2 bitumen are close to those of the carbonate-associated sulfate and similar to the TSR-derived H2S in the same reservoirs. A strong negative correlation exists between S/C atomic ratios and delta C-13 values in the type 2 bitumen in the Dengying Formation, which is interpreted as a result of an increasing incorporation of the C-13-depleted ethanethiol into the bitumen during TSR. This interpretation is consistent with the fact that the remaining ethane became isotopically heavier as TSR proceeded. In addition, the reactive sulfate for TSR was primarily derived from the hydrothermal sulfate, such as barite. This is evidenced by the replacement of hydrothermal barite by the S-34-enriched pyrite and the small differences in delta S-34 value between the barite and the type 2 bitumen (or the TSR-derived H2S) in the same strata. We suggest that TSR in the Ediacaran and Cambrian hydrocarbon reservoirs was probably initiated by hydrothermal activity.
KeywordEdiacaran and Cambrian Solid bitumen Carbon and sulfur isotopes Hydrothermal activity TSR Sulfur source
DOI10.1016/j.precamres.2018.12.014
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; Special Major Project on Petroleum Study of China ; Special Major Project on Petroleum Study of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Special Major Project on Petroleum Study of China ; Special Major Project on Petroleum Study of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Special Major Project on Petroleum Study of China ; Special Major Project on Petroleum Study of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Special Major Project on Petroleum Study of China ; Special Major Project on Petroleum Study of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordCARBONATE-ASSOCIATED SULFATE ; SULFUR ISOTOPIC COMPOSITION ; WUFENG-LONGMAXI FORMATIONS ; FREEZING-POINT DEPRESSION ; PALEOZOIC PETROLEUM POOLS ; GAS-FIELD ; DENGYING FORMATION ; ORGANIC PETROLOGY ; HYDROGEN-SULFIDE ; TARIM BASIN
Language英语
Funding ProjectNational Key R&D Program of China[2017YFC0603106] ; Special Major Project on Petroleum Study of China[2017ZX05008003-040] ; National Natural Science Foundation of China[41730424] ; National Natural Science Foundation of China[41672143]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; Special Major Project on Petroleum Study of China ; Special Major Project on Petroleum Study of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Special Major Project on Petroleum Study of China ; Special Major Project on Petroleum Study of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Special Major Project on Petroleum Study of China ; Special Major Project on Petroleum Study of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Special Major Project on Petroleum Study of China ; Special Major Project on Petroleum Study of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000457657500017
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90547
Collection油气资源研究院重点实验室
Corresponding AuthorLiu, Guangdi; Cai, Chunfang
Affiliation1.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
2.China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China
3.Yangtze Univ, Minist Educ, Key Lab Explorat Technol Oil & Gas Resources, Wuhan 430100, Hubei, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
6.SINOPEC, Petr Explorat & Prod Res Inst, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Pengwei,Liu, Guangdi,Cai, Chunfang,et al. Alteration of solid bitumen by hydrothermal heating and thermochemical sulfate reduction in the Ediacaran and Cambrian dolomite reservoirs in the Central Sichuan Basin, SW China[J]. PRECAMBRIAN RESEARCH,2019,321:277-302.
APA Zhang, Pengwei.,Liu, Guangdi.,Cai, Chunfang.,Li, Meijun.,Chen, Ruiqian.,...&Jiang, Mengya.(2019).Alteration of solid bitumen by hydrothermal heating and thermochemical sulfate reduction in the Ediacaran and Cambrian dolomite reservoirs in the Central Sichuan Basin, SW China.PRECAMBRIAN RESEARCH,321,277-302.
MLA Zhang, Pengwei,et al."Alteration of solid bitumen by hydrothermal heating and thermochemical sulfate reduction in the Ediacaran and Cambrian dolomite reservoirs in the Central Sichuan Basin, SW China".PRECAMBRIAN RESEARCH 321(2019):277-302.
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