| 四川叠合盆地西部中北段深层-超深层海相大型气田形成条件分析 |
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| 引用本文： | 孙玮,刘树根,曹俊兴,邓宾,宋金民,王国芝,袁月,王浩.四川叠合盆地西部中北段深层-超深层海相大型气田形成条件分析[J].岩石学报,2017,33(4):1171-1188. |
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| 作者姓名： | 孙玮 刘树根 曹俊兴 邓宾 宋金民 王国芝 袁月 王浩 |
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| 作者单位： | 油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059,油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059,油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059,油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059,油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059,油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059,油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059,油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059 |
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| 基金项目： | 本文受国家自然科学重点基金项目（41230313）和中国地质调查局项目（121201021000150009）联合资助. |
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| 摘 要： | 绵阳-长宁拉张槽的发现,大大地提升了四川叠合盆地西部深层-超深层海相层系的油气勘探前景。本文利用钻井、地震和野外露头资料和前人研究成果系统分析川西深层-超深层油气地质条件和目前发现的雷口坡组气藏的成藏过程。结果表明,四川叠合盆地西部深层-超深层海相层系有以下寒武统为主的多源供烃系统,多时代(震旦系灯影组白云岩,二叠系白云岩和礁滩体,三叠系雷口坡组微生物岩和颗粒白云岩等)储集层叠合,致密碳酸盐岩、巨厚陆相泥质岩和中下三叠统膏盐岩多级封盖,以断裂(及不整合面)和优质储层构成的立体输导网络等,使得深层-超深层海相层系具备形成大气田的基本条件,是原生气藏和次生气藏共存的天然气富集区。近年来,川西发现的中三叠统雷口坡组四段气藏,其可能成藏过程为生烃中心(下寒武统烃源岩等)→生气中心(灯影组和二叠系古油藏等)→储气中心(灯影组和二叠系古气藏等)→保气中心(雷口坡组次生气藏)。这揭示其深层-超深层既可能还存在着符合四中心耦合成藏的原生气藏,也可能发育着次生气藏,极有可能发现新的大气田。
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| 关 键 词： | 四川盆地 深层-超深层 碳酸盐岩 大气田 海相 |
| 收稿时间： | 2016/6/1 0:00:00 |
| 修稿时间： | 2017/3/20 0:00:00 |
Analysis on the formation conditions of large-scale marine deep and super-deep strata gas fields in the middle-northern segments of western Sichuan Superimposed Basin, China |
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| SUN Wei,LIU ShuGen,CAO JunXing,DENG Bin,SONG JinMin,WANG GuoZhi,YUAN Yue and WANG Hao.Analysis on the formation conditions of large-scale marine deep and super-deep strata gas fields in the middle-northern segments of western Sichuan Superimposed Basin, China[J].Acta Petrologica Sinica,2017,33(4):1171-1188. |
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| Authors: | SUN Wei LIU ShuGen CAO JunXing DENG Bin SONG JinMin WANG GuoZhi YUAN Yue and WANG Hao |
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| Institution: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China. and State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China. |
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| Abstract: | The discovery of the Lower Cambrian Mianyang-Changning intracratonic sag heavily enhanced the petroleum exploration prospects of the deep to super-deep strata (marine carbonates) in western Sichuan Superimposed Basin (SSB). In this paper, we have used drilling, seismic and outcrop data and combined the results of the previous studies to analyze the petroleum geological conditions of the marine deep to super-deep strata and the petroleum accumulation process of the Middle Triassic Leikoupo Fm. in western SSB. It shows that the petroleum geological conditions are very good in the marine deep to super-deep strata in western SSB. There is a multi-source hydrocarbon-supply system in western SSB, which the Lower Cambrian huge mudstone is the main source rock. The superimposed marine reservoir rocks have developed in western SSB, including the Upper Sinian Dengying Fm. dolomite, Permian reef dolomite, and Middle Triassic Leikoupo Fm. dolomite and microbial rocks, and so on. There is a multi-sealing system of the petroleum accumulations in western SSB, which consisted of tight carbonate rocks, mudstone and gypsum strata. However, the three-dimensional conduit networks were developed, which consisted of faults, fractures, unconformities and high quality reservoir layers. These petroleum geological conditions mentioned above make the marine deep to super-deep strata probably form large-scale petroleum accumulations, and the western SSB is a gas-rich region of both primary gas pools and secondary gas pools because the deep burial made oil be cracked to gas. The formation process of the gas pools discovered in the fourth member of the Middle Triassic Leikoupo Fm. in western SSB probably includes four stages, which are hydrocarbon generating center (Lower Cambrian source rocks, etc.), gas generating center (paleo-oil pools in the Upper Sinian and Permian carbonates, etc.), gas accumulating center (paleo-gas pools in the Upper Sinian and Permian carbonates, etc.) and gas preserving center (the secondary gas pools in the Middle Triassic Leikoupo Fm. Carbonates). |
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| Keywords: | Sichuan Basin Deep Strata Carbonate Marine Gas field |
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