油型气乙烷碳同位素演化规律与成因

被引：17

作者：

吴伟

罗超

张鉴

刘文平

机构：

[1] 中国石油西南油气田公司勘探开发研究院

来源：

石油学报 | 2016年 / 37卷 / 12期

关键词：

碳同位素; 页岩气; 同位素倒转; 二次裂解; 湿气裂解;

D O I：

暂无

中图分类号：

P618.13 [石油、天然气];

学科分类号：

070403 [天体物理学];

摘要：

通过分析四川盆地和北美Appalachian、Fort Worth等盆地页岩气和常规油型气乙烷碳同位素特征和成因,得出随着成熟度的增加,乙烷碳同位素经历3个演化阶段:初次生气阶段正常增加,与甲烷碳同位素具有线性相关;二次裂解阶段同位素值减少,与乙烷含量的倒数具有线性关系,符合二端元气混合模型;湿气裂解阶段碳同位素值增加,与乙烷含量的自然对数呈线性关系,符合瑞利分馏模型。不同阶段页岩气碳同位素倒转的成因不同,瑞利分馏阶段碳同位素分馏速率乙烷>丙烷,并且甲烷碳同位素发生次生变化是造成过成熟阶段页岩气碳同位素反序的原因。富12 C的乙烷是四川盆地页岩气高产井的重要地球化学特征。对于成熟度Ro>2.2%的天然气,乙烷碳同位素用于气源鉴别需要用瑞利分馏的公式校正。

引用

页码：1463 / 1471

页数：9

共 24 条

[1]

The origin and evolution of thermogenic gases in organic-rich marine shales.[J].Yongqiang Xiong;Li Zhang;Yuan Chen;Xiaotao Wang;Yun Li;Mingming Wei;Wenmin Jiang;Rui Lei.Journal of Petroleum Science and Engineering.2016,

[2]

The characteristics and significance of conventional and unconventional Sinian–Silurian gas systems in the Sichuan Basin; central China.[J].Caineng Zou;Zhi Yang;Jingxing Dai;Dazhong Dong;Baomin Zhang;Yuman Wang;Shenghui Deng;Jinliang Huang;Keyu Liu;Chun Yang;Guoqi Wei;Songqi Pan.Marine and Petroleum Geology.2015,

[3]

Giant gas discovery in the Precambrian deeply buried reservoirs in the Sichuan Basin; China: Implications for gas exploration in old cratonic basins.[J].Guangyou Zhu;Tongshan Wang;Zengye Xie;Banghua Xie;Keyu Liu.Precambrian Research.2015,

[4]

Geochemical characteristics of shale gas in Xiasiwan area, Ordos Basin [J].

Wu, Wei ;

Dong, Dazhong ;

Yu, Cong ;

Liu, Dan .

ENERGY EXPLORATION & EXPLOITATION, 2015, 33 (01) :25-41

[5]

Carbon isotope effects of methane transport through Anahuac Shale — A core gas study.[J].Jiemin Lu;Toti E. Larson;Rebecca C. Smyth.Journal of Geochemical Exploration.2015,

[6]

Stable carbon isotopes of coal-derived gases sourced from the Mesozoic coal measures in China.[J].Jinxing Dai;Deyu Gong;Yunyan Ni;Shipeng Huang;Wei Wu.Organic Geochemistry.2014,

[7]

Isotopic reversals with respect to maturity trends due to mixing of primary and secondary products in source rocks.[J].Xinyu Xia;James Chen;Robert Braun;Yongchun Tang.Chemical Geology.2012,

[8]

Isotope reversals and universal stages and trends of gas maturation in sealed; self-contained petroleum systems.[J].Barbara Tilley;Karlis Muehlenbachs.Chemical Geology.2012,

[9]

Gigantic; gaseous mushwads in Cambrian shale: Conasauga Formation; southern Appalachians; USA.[J].Jack C. Pashin;David C. Kopaska-Merkel;Ann C. Arnold;Marcella R. McIntyre;William A. Thomas.International Journal of Coal Geology.2012,

[10]

Isotopic reversal (‘rollover’) in shale gases produced from the Mississippian Barnett and Fayetteville formations.[J].John Zumberge;Kevin Ferworn;Stephen Brown.Marine and Petroleum Geology.2011, 1

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