NIGPAS OpenIR  > 中国科学院南京地质古生物研究所
The salt chimney effect: delay of thermal evolution of deep hydrocarbon source rocks due to high thermal conductivity of evaporites
Zhuo, Q. G.1; Meng, F. W. (孟凡巍)2; Zhao, M. J.1; Li, Y.3; Lu, X. S.1; Ni, P.4
2016-08-01
Source PublicationGEOFLUIDS
ISSN1468-8115
Volume16Issue:3Pages:440-451
Abstract

Half of the topseals to the world's largest oilfields are evaporites. Rock salt has a thermal conductivity two to four times greater than that of other sedimentary rocks found in oil- and gas-bearing basins. Strong heat conduction through evaporites can increase the geothermal gradient above evaporite deposits, resulting in a positive thermal anomaly and above-average temperature while simultaneously decreasing the geothermal gradient below evaporites, resulting in a negative thermal anomaly. Most Triassic-Jurassic hydrocarbon source rocks in the Kuqa Basin, western China, are overlain by similar to 1500-m-thick Tertiary evaporites with underlying Cretaceous sandstones and mudstones. Directly measured strata temperatures indicate an obvious break in the steepness of the geothermal gradient above and below Paleogene evaporites, with a significantly steeper geothermal gradient above the evaporites. Simulations of the thermal evolution of source rocks based on data collected from well Kela-2 indicate that if the thickness of evaporites (mainly rock salt and anhydrite rock) in overlying rocks above source rocks increases compared with the thickness of siliciclastic rocks in the overlying rocks, then strata temperatures and vitrinite reflectance in Jurassic source rocks will decrease accordingly. Our thermal simulations based on the thickness and thermal conductivity of evaporites accurately coincide with previous studies based on homogenization temperatures, hydrocarbon-water contact retrospection, and carbon isotope results from natural gases. The gas generation center located in the Kalasu Tectonic Belt today is also sealed in an evaporite-related structural trap that formed at this time. Therefore, the speculated natural gas generation times not only correlate with the evaporite-related structural trap formation, but the calculated maturity of deep source rocks below the evaporites also coincides with current gas reserves. And our studies can help to find the deep oils and gases under thick evaporites.

KeywordEvaporite Kuqa Basin Source Rock Thermal Conductivity Thermal Evolution
DOI10.1111/gfl.12162
Language英语
WOS KeywordKuqa Foreland Basin ; Tarim Basin ; Tian-shan ; China ; Anomalies
Funding ProjectNational Key Projects of China[2011ZX05003] ; 12th Five-year Program of Petrochina[2011B04] ; Major State Basic Research Development Program (973 Program)[2011CB403007] ; National Natural Science Foundation of China[40703018] ; National Natural Science Foundation of China[41173051] ; National Natural Science Foundation of China[41172131]
WOS Research AreaGeochemistry & Geophysics ; Geology
WOS SubjectGeochemistry & Geophysics ; Geology
WOS IDWOS:000380956400007
Funding OrganizationNational Key Projects of China ; 12th Five-year Program of Petrochina ; Major State Basic Research Development Program (973 Program) ; National Natural Science Foundation of China
PublisherWILEY-BLACKWELL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/12389
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorNi, P.
Affiliation1.CNPC, Res Inst Petr Explorat & Dev, Beijing, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Jiangsu, Peoples R China
3.Tarim Oilfield Co, Res Inst Petr Explorat & Dev, Korla, Xinjiang, Peoples R China
4.Nanjing Univ, State Key Lab Mineral Deposit Res, Inst Geofluids, Sch Earth Sci & Engn, Nanjing, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Zhuo, Q. G.,Meng, F. W. ,Zhao, M. J.,et al. The salt chimney effect: delay of thermal evolution of deep hydrocarbon source rocks due to high thermal conductivity of evaporites[J]. GEOFLUIDS,2016,16(3):440-451.
APA Zhuo, Q. G.,Meng, F. W. ,Zhao, M. J.,Li, Y.,Lu, X. S.,&Ni, P..(2016).The salt chimney effect: delay of thermal evolution of deep hydrocarbon source rocks due to high thermal conductivity of evaporites.GEOFLUIDS,16(3),440-451.
MLA Zhuo, Q. G.,et al."The salt chimney effect: delay of thermal evolution of deep hydrocarbon source rocks due to high thermal conductivity of evaporites".GEOFLUIDS 16.3(2016):440-451.
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