鄂尔多斯盆地中央古隆起东侧奥陶系中组合天然气成因与来源

doi:10.7623/syxb201607001

石油学报 ›› 2016, Vol. 37 ›› Issue (7): 821-831.DOI: 10.7623/syxb201607001

• 地质勘探 • 下一篇

鄂尔多斯盆地中央古隆起东侧奥陶系中组合天然气成因与来源

李军^1,2, 赵靖舟^1,2, 王大兴³, 孙六一³, 任军峰³, 武春英³, 吴伟涛^1,2, 赵子龙^1,2, 曲付涛^1,2

1. 西安石油大学地球科学与工程学院陕西西安 710065;
2. 陕西省油气成藏地质学重点实验室陕西西安 710065;
3. 中国石油长庆油田公司勘探开发研究院陕西西安 710018

收稿日期:2015-11-05 修回日期:2016-04-18 出版日期:2016-07-25 发布日期:2016-07-28
通讯作者: 李军,男,1982年12月生,2006年获西安石油大学学士学位,2012年获中国石油大学(北京)博士学位,现为西安石油大学地球科学与工程学院讲师,主要从事油气成藏地质学、非常规油气地质与勘探方面的教学与科研工作。Email:lijun@xsyu.edu.cn
基金资助:
国家自然科学基金项目（No.41502132）和国家重大科技专项（2011ZX05007-004）资助。

Genesis and source of the Ordovician mid-assemblage natural gas in the east side of the central paleo-uplift, Ordos Basin

Li Jun^1,2, Zhao Jingzhou^1,2, Wang Daxing³, Sun Liuyi³, Ren Junfeng³, Wu Chunying³, Wu Weitao^1,2, Zhao Zilong^1,2, Qu Futao^1,2

1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Shaanxi Xi'an 710065, China;
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Shaanxi Xi'an 710065, China;
3. Exploration & Development Research Institute, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China

Received:2015-11-05 Revised:2016-04-18 Online:2016-07-25 Published:2016-07-28

摘要/Abstract

摘要：

随着鄂尔多斯盆地奥陶系天然气勘探工作的不断深入，中央古隆起东侧奥陶系马家沟组五段5亚段—马家沟组五段10亚段中组合天然气勘探取得了重要进展，但目前有关天然气成因与来源的研究还很薄弱。根据天然气地球化学特征、古油藏发育特征等分析结果，并结合天然气成藏地质背景，厘定了鄂尔多斯盆地中央古隆起东侧奥陶系中组合天然气的成因与来源。研究表明，鄂尔多斯盆地奥陶系中组合天然气为上古生界煤系烃源岩生成的煤型气与下古生界碳酸盐岩烃源岩生成的油型气的混合气，并以上古生界煤型气为主。现今气藏天然气组分中甲烷主要来自上古生界煤系烃源岩，上组合以及中组合少部分天然气的乙烷较多来自下古生界油型气，中组合大部分天然气乙烷及重烃仍来自上古生界煤系烃源岩。

关键词: 天然气碳同位素, 煤型气, 气源对比, 奥陶系中组合, 鄂尔多斯盆地

Abstract:

With the continuous deepening of Ordovician natural gas exploration in Ordos Basin, a great advancement has been achieved in the mid-assemblage natural gas exploration of Sub-member 5 to Sub-member 10 of Member 5, Ordovician Majiagou Formation in the east side of the central paleo-uplift. However, there is still insufficient research on the genesis and source of natural gas. Based on the geochemical characteristics of natural gas, the development characteristics of paleo-oil reservoirs and other analysis results, in combination with geological conditions of natural gas accumulation, the genesis and source of Ordovician mid-assemblage natural gas in the east side of the central paleo-uplift, Ordos Basin are determined. The research indicates that Ordovician mid-assemblage natural gas in Ordos Basin is a mixture of the coal-type gas derived from Upper Paleozoic coaly source rocks and the oil-associated gas generated from Lower Paleozoic carbonate rocks, dominated by Upper Paleozoic coal-type gas. Among the current natural gas compositions of gas reservoirs, the methane is mainly sourced from the Upper Paleozoic coaly source rocks, the ethane in a small part of upper-assemblage and mid-assemblage natural gas is mostly derived from the Lower Paleozoic oil-associated gas, while the ethane and heavy hydrocarbon of most mid-assemblage natural gas are originated from the Upper Paleozoic coaly source rocks

Key words: carbon isotope of natural gas, coal-type gas, gas source correlation, Ordovician mid-assemblage, Ordos Basin

中图分类号:

TE122

李军, 赵靖舟, 王大兴, 孙六一, 任军峰, 武春英, 吴伟涛, 赵子龙, 曲付涛. 鄂尔多斯盆地中央古隆起东侧奥陶系中组合天然气成因与来源[J]. 石油学报, 2016, 37(7): 821-831.

Li Jun, Zhao Jingzhou, Wang Daxing, Sun Liuyi, Ren Junfeng, Wu Chunying, Wu Weitao, Zhao Zilong, Qu Futao. Genesis and source of the Ordovician mid-assemblage natural gas in the east side of the central paleo-uplift, Ordos Basin[J]. Acta Petrolei Sinica, 2016, 37(7): 821-831.

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鄂尔多斯盆地中央古隆起东侧奥陶系中组合天然气成因与来源

Genesis and source of the Ordovician mid-assemblage natural gas in the east side of the central paleo-uplift, Ordos Basin

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