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Iodine-129 chronological study of brines from an Ordovician paleokarst reservoir in the Lunnan oilfield, Tarim Basin
Chen, Jian1; Liu, Dayong1; Peng, Ping'an1; Ning, Chen2,3; Hou Xiaolin2,3; Zhang Baoshou4; Xiao Zhongyao4
2016-02-01
Source PublicationAPPLIED GEOCHEMISTRY
Volume65Issue:2016Pages:14-21
SubtypeArticle
AbstractPrevious studies have shown that brines in an Ordovician paleokarst reservoir of the Lunnan oilfield in the Tarim Basin, China, are the product of mixing of paleo-evaporated seawater in the east with paleo-meteoric waters in the west. In order to put time constraints on the brine and related hydrocarbons in this field, 10 brine samples were collected, for which the iodine concentrations and I-129/I ratios were measured and discussed. The iodine concentration (3.70-31.2 mg/L) and the I-129/I ratio (189 -897 x 10(-15)) show that the iodine in the paleoseawater and meteoric water (MW) had different origins and I-129 characteristics. The paleoseawater has a high iodine content (similar to 31 mg/L), indicating that iodine was introduced into the reservoir along with thermally generated hydrocarbons, possibly in the Cretaceous, from the Caohu Sag in the eastern area. Based on consideration of all possible origins of iodine and I-129 in the brines, it is suggested that the meteoric water maintained its initial iodine content (0.01 mg/L) and I-129/I ratio (1500 x 10(-15)), whereas the iodine-enriched paloseawater (IPSW) exhibited a secular I-129 equilibrium (N-sq = 39 atom/mu L) as a result of fissiogenic I-129 input in the reservoir over a long period of time. The model of brine evolution developed on that basis confirmed that meteoric water entered the reservoir in the Miocene at about 10 Ma, and partially mixed with the iodine-enriched paleoseawater. The movement of meteoric water was facilitated by faults created during the Himalayan orogeny, then became more dense after dissolving Paleogene halite and infiltrated into the reservoir at high pressure. The iodine and I-129 concentration in the brine contains information about the path and history of the fluid in the reservoir. This may be useful in oil exploration, since the movement of water was, to some extent, related to hydrocarbon migration. (C) 2015 Elsevier Ltd. All rights reserved.
KeywordIodine Iodine 129 Oilfield Water Tarim Basin
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.apgeochem.2015.10.012
WOS KeywordACCELERATOR MASS-SPECTROMETRY ; RESIDENCE TIMES ; SOURCE AGES ; NW CHINA ; TAKLIMAKAN DESERT ; FORMATION WATERS ; CRUSTAL FLUIDS ; NATURAL I-129 ; PORE WATERS ; IN-SITU
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000366648500002
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5864
Collection加速器质谱中心
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Xian AMS Ctr, Xian 710075, Peoples R China
3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China
4.PetroChina, Tarim Oilfield Co, Kuerle 841000, Peoples R China
Recommended Citation
GB/T 7714
Chen, Jian,Liu, Dayong,Peng, Ping'an,et al. Iodine-129 chronological study of brines from an Ordovician paleokarst reservoir in the Lunnan oilfield, Tarim Basin[J]. APPLIED GEOCHEMISTRY,2016,65(2016):14-21.
APA Chen, Jian.,Liu, Dayong.,Peng, Ping'an.,Ning, Chen.,Hou Xiaolin.,...&Xiao Zhongyao.(2016).Iodine-129 chronological study of brines from an Ordovician paleokarst reservoir in the Lunnan oilfield, Tarim Basin.APPLIED GEOCHEMISTRY,65(2016),14-21.
MLA Chen, Jian,et al."Iodine-129 chronological study of brines from an Ordovician paleokarst reservoir in the Lunnan oilfield, Tarim Basin".APPLIED GEOCHEMISTRY 65.2016(2016):14-21.
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