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Geochemical characteristics and depositional paleoenvironment of source rocks from the Lower Cretaceous Chijinbao Formation in Jiuxi Basin, China
Ma, Bo1,2; Ji, Liming1,3; Jin, Peihong1; Zhang, Mingzhen1,3; Yuan, Bochao4; Long, Liwen5
2022-03-01
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN0920-4105
Volume210Pages:19
AbstractThe Lower Cretaceous Chijinbao Formation is one of the primary source rocks in the Jiuxi Basin in Northwest China. However, it is poorly studied due to the lack of a complete stratigraphic sequence exposed by drilling. In this research, an integrated analysis of palynofacies, organic geochemistry, and element geochemistry was systematically conducted on samples with longitudinal continuity collected from the Chijinbao Formation in the Hanxia Section of the Jiuxi Basin to determine the distribution of source rocks and the source and type of organic matter and to reconstruct the depositional paleoenvironment of the Chijinbao Formation. The lower part of the sequence, which is governed by poor source rocks with Type III organic matter, is characterized by palynofacies A (woody tissue-charcoal assemblage) grown in a proximal alluvial fan-shallow lacustrine environment. The excellent source rocks with mostly Type II1 organic matter are considerable in the middle part of the sequence, which is marked by palynofacies B (amorphous organic matter assemblage), and occur in a distal semi-deep lacustrine-deep lacustrine environment. The upper part of the sequence is largely composed of poor and fair source rocks, represented by palynofacies C (amorphous organic matter-woody tissue assemblage), and a small amount of sporadically distributed good and excellent source rocks (approximately 1/3), which may be deposited in a proximal fan delta and a local semi-deep lacustrine-deep lacustrine environment. A semiarid-semi-humid climate and a freshwater-brackish water environment prevailed during the deposition of the Chijinbao Formation. The lower part of the sequence is characterized by the highest terrestrial detritus influx, strong weathering, humid paleoclimate, oxic water column conditions, and the lowest paleoproductivity. The middle part of the sequence has the lowest terrestrial detritus influx, relatively weak weathering, relatively arid paleoclimate, predominantly anoxic water environment, and the highest paleoproductivity. The climate became humid again during the deposition of the upper part, which is typified by an intermediate terrestrial detritus influx, strong weathering, fluctuations of oxic-anoxic bottom-water conditions, and moderate paleoproductivity. The correlation analysis of element proxies suggests that the increase in salinity during the deposition of the middle part is associated with an arid climate. Amorphous organic matter, which is derived mostly from aquatic organisms and degraded terrestrial higher plants, is the major hydrocarbon generation component in the source rocks of the Chijinbao Formation. It increases in abundance with an improvement in water reducibility and productivity, favoring the formation and preservation of excellent source rocks.
KeywordSource rock Palynofacies Element geochemistry Paleoenvironment Chijinbao formation Jiuxi basin
DOI10.1016/j.petrol.2021.109968
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; Key Laboratory Project of Gansu Province ; Key Laboratory Project of Gansu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; Key Laboratory Project of Gansu Province ; Key Laboratory Project of Gansu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; Key Laboratory Project of Gansu Province ; Key Laboratory Project of Gansu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; Key Laboratory Project of Gansu Province ; Key Laboratory Project of Gansu Province
WOS KeywordTRIASSIC YANCHANG FORMATION ; ORGANIC-MATTER ; JIUQUAN BASIN ; ORDOS BASIN ; PALEOCLIMATE CONDITIONS ; ELEMENT GEOCHEMISTRY ; XIAGOU FORMATION ; NORTHWEST CHINA ; QINGXI SAG ; OIL-SHALE
Language英语
Funding ProjectNational Natural Science Foundation of China[41672137] ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences[SKLOG-201701] ; Key Laboratory Project of Gansu Province[1309RTSA041]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; Key Laboratory Project of Gansu Province ; Key Laboratory Project of Gansu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; Key Laboratory Project of Gansu Province ; Key Laboratory Project of Gansu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; Key Laboratory Project of Gansu Province ; Key Laboratory Project of Gansu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; State Key Laboratory of Organic Geochem-istry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences ; Key Laboratory Project of Gansu Province ; Key Laboratory Project of Gansu Province
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
WOS IDWOS:000731264100001
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/103904
Collection兰州油气中心
Corresponding AuthorJi, Liming
Affiliation1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China
4.PetroChina Yumen Oilfield Co, Res Inst Explorat & Dev, Jiuquan 735019, Gansu, Peoples R China
5.PetroChina Res Inst Petr Explorat & Dev Northwest, Lanzhou 730020, Gansu, Peoples R China
Recommended Citation
GB/T 7714
Ma, Bo,Ji, Liming,Jin, Peihong,et al. Geochemical characteristics and depositional paleoenvironment of source rocks from the Lower Cretaceous Chijinbao Formation in Jiuxi Basin, China[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2022,210:19.
APA Ma, Bo,Ji, Liming,Jin, Peihong,Zhang, Mingzhen,Yuan, Bochao,&Long, Liwen.(2022).Geochemical characteristics and depositional paleoenvironment of source rocks from the Lower Cretaceous Chijinbao Formation in Jiuxi Basin, China.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,210,19.
MLA Ma, Bo,et al."Geochemical characteristics and depositional paleoenvironment of source rocks from the Lower Cretaceous Chijinbao Formation in Jiuxi Basin, China".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 210(2022):19.
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