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Noble gas isotopic variations and geological implication of Longmaxi shale gas in Sichuan Basin, China
Cao, Chunhui1,2; Zhang, Mingjie1; Tang, Qingyan1; Yang, Yang1; Lv, Zonggang3; Zhang, Tongwei1; Chen, Chang3; Yang, Hui2; Li, Liwu2
2018
Source PublicationMARINE AND PETROLEUM GEOLOGY
ISSN0264-8172
Volume89Pages:38-46
SubtypeArticle
AbstractThe large difference in carbon isotopic compositions of shale gases from the Lower Silurian Longmaxi Formation marine organic-rich shales between Changning and Weiyuan areas in Sichuan Basin, China is a still debate issue. In this study, 30 produced shale gas samples were collected during 3 years production period and analyzed for noble gas (He, Ne and Ar) abundances and isotopic compositions to reveal the origin and variation causes of shale gases. The results show that the Longmaxi shale gases show low (3)Hel(4)He and Ne-20/Ne-22, and varied but high Ne-21/Ne-22 and Ar-40/Ar-36 ratios. The Weiyuan shale gases are characterized by low He-3/He-4, high Ar-40/Ar-36 ratios and varied He-4 and Ar-40 abundances, and a large increase in Ar-40 contents and a slight decrease in Ar-40/Ar-36 ratios display during 3 years shale gas production period from Jan. 2014 to Jun. 2016. Whereas the Changning shale gases are characterized by low and varied He-3/He-4 ratios and high He-4 and Ar-40 abundances, and small fluctuations in Ar-40 contents and Ar-40/Ar-36 ratios exhibit during 3 years production period. In addition, the shale gases produced from horizontal wells in the Weiyuan area possessed higher Ar-40 and Ar-40/Ar-36 ratio than that those from vertical wells at same well site. The noble gas isotopic compositions and variation of Longmaxi shale gases suggested that they are originated mainly from crust, air saturated fluid (ASF) and radiogenic accumulation. The variation of Ar-40 and He-4 contents during shale gas production mainly reflects the degree of shale gas source supply from mineral matrix to fracture network, and the greater increases in Ar-40 and He-4 contents with production time show less abundant shale gas supply. Therefore, the increase trend of Ar-40 contents with shale gas production time in the Weiyuan area during 3 years production period possibly suggests less adequate shale gas supply. In contrast, the uniform or nearly constant of Ar-40 content through production time in the Changing area indicates abundant supply of shale gas sources from mineral matrix, resulting in less production decline. Variation in He-4 and Ar-40 contents through shale gas production time could be sensitive indicators of abundant or depleted shale gas source supply. (C) 2017 Elsevier Ltd. All rights reserved.
KeywordShale Gas Supply Origin Noble Gas Isotope Shale Gas Longmaxi Formation Sichuan BasIn In chIna
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.marpetgeo.2017.01.022
Funding OrganizationNational Basic Research Program(2012CB214701) ; National Basic Research Program(2012CB214701) ; Public Interest Special Fund of China MLR(201511020) ; Public Interest Special Fund of China MLR(201511020) ; NSF of China(41502143 ; NSF of China(41502143 ; Key project of China MOE(311010) ; Key project of China MOE(311010) ; Project of Gansu Key Lab(1309RTSA041) ; Project of Gansu Key Lab(1309RTSA041) ; 41572136 ; 41572136 ; 41472070 ; 41472070 ; 41372095) ; 41372095) ; National Basic Research Program(2012CB214701) ; National Basic Research Program(2012CB214701) ; Public Interest Special Fund of China MLR(201511020) ; Public Interest Special Fund of China MLR(201511020) ; NSF of China(41502143 ; NSF of China(41502143 ; Key project of China MOE(311010) ; Key project of China MOE(311010) ; Project of Gansu Key Lab(1309RTSA041) ; Project of Gansu Key Lab(1309RTSA041) ; 41572136 ; 41572136 ; 41472070 ; 41472070 ; 41372095) ; 41372095) ; National Basic Research Program(2012CB214701) ; National Basic Research Program(2012CB214701) ; Public Interest Special Fund of China MLR(201511020) ; Public Interest Special Fund of China MLR(201511020) ; NSF of China(41502143 ; NSF of China(41502143 ; Key project of China MOE(311010) ; Key project of China MOE(311010) ; Project of Gansu Key Lab(1309RTSA041) ; Project of Gansu Key Lab(1309RTSA041) ; 41572136 ; 41572136 ; 41472070 ; 41472070 ; 41372095) ; 41372095) ; National Basic Research Program(2012CB214701) ; National Basic Research Program(2012CB214701) ; Public Interest Special Fund of China MLR(201511020) ; Public Interest Special Fund of China MLR(201511020) ; NSF of China(41502143 ; NSF of China(41502143 ; Key project of China MOE(311010) ; Key project of China MOE(311010) ; Project of Gansu Key Lab(1309RTSA041) ; Project of Gansu Key Lab(1309RTSA041) ; 41572136 ; 41572136 ; 41472070 ; 41472070 ; 41372095) ; 41372095)
WOS KeywordORGANIC-MATTER ACCUMULATION ; SILURIAN MARINE SHALE ; CARBON-DIOXIDE ; SOUTH CHINA ; GASEOUS HYDROCARBONS ; SOUTHWESTERN CHINA ; NUCLEOGENIC NEON ; PALEOZOIC SHALES ; UPPER ORDOVICIAN ; EARTHS MANTLE
Indexed BySCI
Language英语
Funding OrganizationNational Basic Research Program(2012CB214701) ; National Basic Research Program(2012CB214701) ; Public Interest Special Fund of China MLR(201511020) ; Public Interest Special Fund of China MLR(201511020) ; NSF of China(41502143 ; NSF of China(41502143 ; Key project of China MOE(311010) ; Key project of China MOE(311010) ; Project of Gansu Key Lab(1309RTSA041) ; Project of Gansu Key Lab(1309RTSA041) ; 41572136 ; 41572136 ; 41472070 ; 41472070 ; 41372095) ; 41372095) ; National Basic Research Program(2012CB214701) ; National Basic Research Program(2012CB214701) ; Public Interest Special Fund of China MLR(201511020) ; Public Interest Special Fund of China MLR(201511020) ; NSF of China(41502143 ; NSF of China(41502143 ; Key project of China MOE(311010) ; Key project of China MOE(311010) ; Project of Gansu Key Lab(1309RTSA041) ; Project of Gansu Key Lab(1309RTSA041) ; 41572136 ; 41572136 ; 41472070 ; 41472070 ; 41372095) ; 41372095) ; National Basic Research Program(2012CB214701) ; National Basic Research Program(2012CB214701) ; Public Interest Special Fund of China MLR(201511020) ; Public Interest Special Fund of China MLR(201511020) ; NSF of China(41502143 ; NSF of China(41502143 ; Key project of China MOE(311010) ; Key project of China MOE(311010) ; Project of Gansu Key Lab(1309RTSA041) ; Project of Gansu Key Lab(1309RTSA041) ; 41572136 ; 41572136 ; 41472070 ; 41472070 ; 41372095) ; 41372095) ; National Basic Research Program(2012CB214701) ; National Basic Research Program(2012CB214701) ; Public Interest Special Fund of China MLR(201511020) ; Public Interest Special Fund of China MLR(201511020) ; NSF of China(41502143 ; NSF of China(41502143 ; Key project of China MOE(311010) ; Key project of China MOE(311010) ; Project of Gansu Key Lab(1309RTSA041) ; Project of Gansu Key Lab(1309RTSA041) ; 41572136 ; 41572136 ; 41472070 ; 41472070 ; 41372095) ; 41372095)
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000418976800005
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93162
Collection兰州油气中心
Corresponding AuthorZhang, Mingjie
Affiliation1.Lanzhou Univ, Sch Earth Sci, Key Lab Mineral Resources Western China Gansu, Lanzhou 730000, Gansu, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Key Lab Petr Resources Gansu Prov, Lanzhou 730000, Gansu, Peoples R China
3.PetroChina Southwest Oil & Gas Field Co, Shunan Gas Mine Field, Luzhou 646000, Peoples R China
Recommended Citation
GB/T 7714
Cao, Chunhui,Zhang, Mingjie,Tang, Qingyan,et al. Noble gas isotopic variations and geological implication of Longmaxi shale gas in Sichuan Basin, China[J]. MARINE AND PETROLEUM GEOLOGY,2018,89:38-46.
APA Cao, Chunhui.,Zhang, Mingjie.,Tang, Qingyan.,Yang, Yang.,Lv, Zonggang.,...&Li, Liwu.(2018).Noble gas isotopic variations and geological implication of Longmaxi shale gas in Sichuan Basin, China.MARINE AND PETROLEUM GEOLOGY,89,38-46.
MLA Cao, Chunhui,et al."Noble gas isotopic variations and geological implication of Longmaxi shale gas in Sichuan Basin, China".MARINE AND PETROLEUM GEOLOGY 89(2018):38-46.
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