南加蓬次盆深水区天然气成因类型及气源探讨

doi:10.3969/j.issn.1672-7703.2017.02.008

中国石油勘探 ›› 2017, Vol. 22 ›› Issue (2): 67-73.DOI: 10.3969/j.issn.1672-7703.2017.02.008

南加蓬次盆深水区天然气成因类型及气源探讨

兰蕾, 孙玉梅, 王柯

中海油研究总院

收稿日期:2016-04-25 修回日期:2017-02-16 出版日期:2017-03-10 发布日期:2017-03-10
作者简介:兰蕾(1987-),女,河南南阳人,硕士,2012 年毕业于中国石油大学(北京),工程师,现主要从事油气地球化学研究工作。地址:北京市朝阳区太阳宫南街 6 号中海油大厦,邮政编码:100028。E-mail:lanlei@cnooc.com.cn
基金资助:
国家科技重大专项“海外大陆边缘盆地勘探开发实用新技术研究”（2011ZX05030-001）。

Genetic types and sources of natural gas in deep water areas in South Gabon Sub-basin

Lan Lei, Sun Yumei, Wang Ke

CNOOC Research Institute

Received:2016-04-25 Revised:2017-02-16 Online:2017-03-10 Published:2017-03-10
Contact: 10.3969/j.issn.1672-7703.2017.02.008

摘要/Abstract

摘要： 南加蓬次盆深水区L气田天然气具有异常重的碳同位素组成，甲烷和乙烷碳同位素值分别为-32.8‰~-28.4‰和-25.8‰~-23.4‰，以天然气乙烷碳同位素判别标准，L气田天然气应为煤型气。区域上的烃源岩和油气研究发现，该区白垩系盐下主要发育腐泥型油源岩，腐殖型气源岩不太发育，不具备形成大型煤型气田的地质条件。碳同位素分析表明，加蓬盆地及邻区白垩系巴雷姆阶，尤其是Melania组湖相优质烃源岩具有异常重的碳同位素组成，与L气田天然气异常重的乙烷碳同位素特征相似。天然气气源分析表明，L气田天然气来源于白垩系盐下湖相烃源岩生成的高-过成熟原油裂解气，其中巴雷姆阶Melania组湖相烃源岩为主要烃源岩。

关键词: 南加蓬次盆, 碳同位素, 天然气成因类型, 气源分析

Abstract: The natural gas in the deepwater L Gasfeld in the South Gabon Sub-basin is characterized by abnormally heavy carbon isotopic compositions, with δ¹³C₁ and δ¹³C₂ ranging from -32.8‰ to -28.4‰ and from -25.8‰ to -23.4‰, respectively. According to the ethane carbon isotope criterion of natural gas, the natural gas in the L gasfeld is classifed as coal-type gas. The investigation on regional source rocks and hydrocarbon resources shows that this area is geologically unqualifed for the formation of large coal-type gas felds, since sapropel type oil source rocks are mainly developed while humic gas source rocks are poorly developed. Carbon isotope analysis reveals that abnormally heavy carbon isotopic composition occurs during the Cretaceous Barremian Stage in the Gabon Basin and its neighboring areas, especially in the Melania Formation lacustrine good source rocks. This is similar with abnormally heavy ethane carbon isotope of natural gas in the L gasfeld. Gas source analysis indicates that the natural gas in the L gasfeld is mainly derived from high-over maturity oil cracked gas which is generated by the Cretaceous sub-salt lacustrine source rocks. In particular, the lacustrine source rocks of Barremian Melania Formation are dominant.

Key words: genetic type of natural gas, gas source analysis, South Gabon Sub-basin, carbon isotope

中图分类号:

TE112.111

兰蕾, 孙玉梅, 王柯. 南加蓬次盆深水区天然气成因类型及气源探讨[J]. 中国石油勘探, 2017, 22(2): 67-73.

Lan Lei, Sun Yumei, Wang Ke. Genetic types and sources of natural gas in deep water areas in South Gabon Sub-basin[J]. China Petroleum Exploration, 2017, 22(2): 67-73.

参考文献

[1] 戴金星.天然气碳氢同位素特征和各类天然气鉴别[J]．天然气地球科学，1993,4(2-3):1-40. Dai Jinxing. Character of carbon and hydrogen isotope of natural gas and their identification [J]. Natural Gas and Geoscience, 1993,4(2-3):1-40.
[2] 徐永昌.天然气成因理论及应用[M].北京:科学出版社，1994:97-106. Xu Yongchang. Formation and application of natural gas [M]. Beijing: Science Press, 1994:97-106.
[3] 秦雁群，梁英波，张光亚，巴丹，杨丽丽，吴鹏. 巴西东部海域深水盐上碎屑岩油气成藏条件与勘探方向[J].中国石油勘探，2015, 20(5):63-72. Qin Yanqun, Liang Yingbo, Zhang Guangya, Ba Dan, Yang Lili, Wu Peng. Hydrocarbon accumulation conditions and further exploration of post-salt clastic rock in Brazil’s eastern deepwater area [J]. China Petroleum Exploration, 2015,20(5):63-72.
[4] Burwood R, Leplat P, Mycke B, Paulet J. Rifted margin source rock deposition: a carbon isotope and biomarker study of a West African lower cretaceous “Lacustrine” section [J]. Organic Geochemistry, 1992,19(1-3):41-52.
[5] Gon?alves F T T. Organic and isotope geochemistry of the Early Cretaceous rift sequence in the Camamu Basin, Brazil: paleolimnological inferences and source rock models [J]. Organic Geochemistry, 2002,33(1):67-80.
[6] Harris N B, Freeman K H, Pancost R D, White TS, Mitchell G D. The character and origin of lacustrine source rocks in the Lower Cretaceous synrift section, Congo Basin, west Africa [J]. AAPG Bulletin, 2004,88(8):1163-1184.
[7] 黄兴文，胡孝林，于水，孙鹏超，刘新颖．南加蓬次盆盐下油气分布规律与成藏特征[J]．中国海上油气，2015,27(2):17-23． Huang Xingwen， Hu Xiaolin, Yu Shui, Sun Pengchao, Liu Xinying. Hydrocarbon distribution and accumulation characteristics of pre-salt zones in South Gabon sub-basin [J]. China Offshore Oil and Gas, 2015,27(2):17-23．
[8] 郭念发，刘子煊.加蓬海岸盆地Salsich区块油气藏特征及勘探潜力[J].中国石油勘探，2015,20(2):82-90. Guo Nianfa，Liu Zixuan .Characteristics and exploration potential of oil and gas reservoir in Salsich Block, North Gabon Sub-basin [J].China Petroleum Exploration, 2015,20(2):82-90.
[9] 童晓光，关增淼．世界石油勘探开发图集（非洲地区分册）[M]．北京:石油工业出版社，2002． Tong Xiaoguang，Guan Zengmiao．Atlas of world petroleum exploration and development (Africa) [M]．Beijing: Petroleum Industry Press，2002．
[10] Chen Anqing，Jin Chong，Lou Zhanghua，Chen Hongde, Xu Shenglin, Huang Keke, et al． Salt tectonics and basin evolution in the Gabon Coastal basin，West Africa [J]．Journal of Earth Science，2013,24(6):903-917．
[11] Mounguengui M M, Lang J, Guiraud M, Jocktane O. Sedimentary dynamics and structural geology of pre-rift deposits of the interior basin of Gabon [J]. Journal of African Earth Sciences, 2002,35(2):315-329.
[12] 徐睿，奥立德.北加蓬次盆白垩系盐构造发育特征及成因分析[J].中国石油勘探，2016,21(5):70-74. Xu Rui, Ao Lide. Genesis and distribution of Cretaceous salt structures in North Gabon Subbasin [J]. China Petroleum Exploration, 2016,21(5):70-74.
[13] Brumboiu A O, Hawker D P, Norquay D A, Wolcott D K. Application of Semipermeable Membrane Technology in the Measurement of Hydrocarbon Gases in Drilling Fluids [M].California: Society of Petroleum Engineers, 2000.
[14] 孙玉梅，李友川，黄正吉．部分近海湖相烃源岩有机质异常碳同位素组成[J]．石油勘探与开发，2009,36(5):607-616. Sun Yumei, Li Youchuan, Huang Zhengji. Abnormal carbon isotopic compositions in organic matter of lacustrine source rocks close to sea [J]. Petroleum Exploration and Development, 2009,36(5):607-616.
[15] 黄第藩.陆相烃源岩有机质中碳同位素组成的分布特征[J].中国海上油气：地质，1993,7(4):1-5. Huang Difan. Distribution characteristics of carbon isotopic composition in organic matter in terrestrial source rocks [J]. China Offshore Oil and Gas (Geology), 1993,7(4):1-5.
[16] Schoell M. Stable isotopes in petroleum research [J]. Advances in Petroleum Geochemistry, 1984(1):215-245.
[17] 宋岩，徐永昌．天然气成因类型及其鉴别[J]．石油勘探与开发，2005,32(4):24-29． Song Yan, Xu Yongchang. Origin and identification of natural gases [J]. Petroleum Exploration and Development, 2005,32(4):24-29.
[18] 孙玉梅，孙涛，许志刚．东非海岸坦桑尼亚盆地烃源岩特征与油气来源[J]．中国海上油气，2016,28(1):1-7. Sun Yumei, Sun Tao, Xu Zhigang. Source rock characteristics and oil-gas origins in Tanzania basin, East Africa coast [J]. China Offshore Oil and Gas, 2016,28(1):1-7.

南加蓬次盆深水区天然气成因类型及气源探讨

Genetic types and sources of natural gas in deep water areas in South Gabon Sub-basin

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