四川盆地东南部中、下寒武统膏岩盖层分布特征及封盖有效性
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摘要
通过野外剖面、钻井剖面的精细对比,结合宽带约束的地震资料反演,对四川盆地东南地区中、下寒武统膏岩盖层的分布特征进行了研究,并在四川盆地及周缘构造演化的基础之上对中、下寒武统膏岩盖层的封盖有效性进行了探讨。四川盆地东南地区中、下寒武统膏岩连片分布,呈北东向展布,发育两个膏岩厚度中心,膏岩展布和圈闭分布完全匹配。在加里东期和印支期,四川盆地东南地区中、下寒武统膏岩层未遭受破坏,能够有效封盖震旦系古油(气)藏;在燕山期和喜马拉雅期,则膏岩层遭受破坏,失去了对丁山-林滩场地区古油(气)藏的封盖作用。同时指出,七跃山断裂以西地区膏岩层在后期构造运动中未被完全破坏,能够对盐下油气藏起到封盖作用,是川东南地区寒武系盐下的有利勘探区带。
Based on correlation of outcrop section with wellbore pofile and in combination with seismic inversion under the constraint of broadband,this paper analyzed the distribution of the Middle-Lower Cambrian evaporite cap rocks in the southeast of Sichuan Basin.It also discussed the sealing effectiveness of the evaporite cap rocks based on study of the tectonic evolution of Sichuan Basin and its periphery.In the southeastern Sichuan Basin,the Middle-lower Cambrian evaporites are widely distributed in northeast direction with two thickness centers,and the distribution of evaporites coincides perfectly with the trap distribution.During the Caledonian and Indosinian period,sealing capacity of the Middle-Lower Cambrian evaporites was not destroyed,so they could serve as effective seals for the Sinian ancient oil(gas) accumulations.Whereas,their sealing capacity was lost during the Yanshan and Himalayan period,thus the ancient oil(gas) accumulations in the Dingshan-Lingtanchang area were not effectively preserved.As the Middle-Lower Cambrian evaporite cap rocks to the west of Qiyueshan fault were not destroyed completely post-Indosinian movement,they could effectively seal the presalt Sinian oil(gas) accumulation,thus this area is favorable for petroleum exploration in the pre-salt strata in southeastern Sichuan Basin.
Based on correlation of outcrop section with wellbore pofile and in combination with seismic inversion under the constraint of broadband,this paper analyzed the distribution of the Middle-Lower Cambrian evaporite cap rocks in the southeast of Sichuan Basin.It also discussed the sealing effectiveness of the evaporite cap rocks based on study of the tectonic evolution of Sichuan Basin and its periphery.In the southeastern Sichuan Basin,the Middle-lower Cambrian evaporites are widely distributed in northeast direction with two thickness centers,and the distribution of evaporites coincides perfectly with the trap distribution.During the Caledonian and Indosinian period,sealing capacity of the Middle-Lower Cambrian evaporites was not destroyed,so they could serve as effective seals for the Sinian ancient oil(gas) accumulations.Whereas,their sealing capacity was lost during the Yanshan and Himalayan period,thus the ancient oil(gas) accumulations in the Dingshan-Lingtanchang area were not effectively preserved.As the Middle-Lower Cambrian evaporite cap rocks to the west of Qiyueshan fault were not destroyed completely post-Indosinian movement,they could effectively seal the presalt Sinian oil(gas) accumulation,thus this area is favorable for petroleum exploration in the pre-salt strata in southeastern Sichuan Basin.
引文
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[20]何治亮,汪新伟,李双建,等.中上扬子地区燕山运动及其对油气保存的影响[J].石油实验地质,2011,33(1):1-11.He Zhiliang,Wang Xinwei,Li Shuangjian,et al.Yanshan Movementand its influence on petroleum preservation in Middle-Upper Yangtzeregion[J].Petroleum Geology&Experiment,2011,33(1):1-11.
[2]金之钧,蔡立国.中国海相油气勘探前景、主要问题与对策[J].石油与然气地质,2006,27(6):722-730.Jin Zhijun,Cai Liguo.Exploration propects,problems and strategies ofmarine oil and gas in China[J].Oil&Gas Geology,2006,27(6):722-730.
[3]沃玉进,肖开华,周雁,等.中国南方海相层系油气成藏组合类型与勘探前景[J].石油与然气地质,2006,27(1):11-16.Wo Yujin,Xiao Kaihua,Zhou Yan,et al.Types of marine plays insouthern China and exploration prospects[J].Oil&Gas Geology,2006,27(1):11-16.
[4]肖开华,沃玉进,周雁,等.中国南方海相层系油气成藏特点与勘探方向[J].石油与然气地质,2006,27(3):316-325.Xiao Kaihua,Wo Yujin,Zhou Yan,et al.Petroleum reservoiring cha-racteristics and exploration direction in marine strata in southern Chi-na[J].Oil&Gas Geology,2006,27(3):316-325.
[5]马永生,楼章华,郭彤楼,等.中国南方海相地层油气保存条件综合评价技术体系探讨[J].地质学报,2006,80(3):406-417.Ma Yongsheng,Lou Zhanghua,Guo Tonglou,et al.An exploration ona technological evaluation for marine system of petroleum preservationstrata in South China[J].Acta Geologica Sinica,2006,80(3):406-417.
[6]汤良杰,崔敏.中上扬子区关键构造变革期、构造变形样式与油气保存[J].石油实验地质,2011,33(1):12-16.Tang Liangjie,Cui Min.Key tectonic changes,deformation styles andhydrocarbon preservations in Middle-Upper Yangtze region[J].Pe-troleum Geology&Experiment,2011,33(1):12-16.
[7]金之钧,龙胜祥,周雁,等.中国南方膏盐岩分布特征[J].石油与天然气地质,2006,27(5):571-583,593.Jin Zhijun,Long Shengxiang,Zhou Yan,et al.A study on the distri-bution of saline-deposit in southern China[J].Oil&Gas Geology,2006,27(5):571-583,593.
[8]金之钧,周雁,云金表,等.我国海相地层膏盐岩盖层分布与近期油气勘探方向[J].石油与天然气地质,2010,27(6):715-724.Jin Zhijun,Zhou Yan,Yun Jinbiao,et al.Distribution of gypsum-saltcap rocks and near-term hydrocarbon exploration targets in the marinesequences of China[J].Oil&Gas Geology,2010,27(6):715-724.
[9]马永生.四川盆地普光超大型气田的形成机制[J].石油学报,2007,28(2):9-21.Ma Yongsheng.Generation mechanism of Puguang Gas Field in Si-chuan Basin[J].Acta Petrolei Sinica,2007,28(2):9-21.
[10]郭彤楼.元坝深层礁滩气田基本特征与成藏主控因素[J].天然气工业,2011,31(10):12-16.Guo Tonglou.Basic characteristics of deep reef-bank reservoirs andmajor controlling factors of gas pools in the Yuanba Gas Field[J].Natural Gas Industry,2011,31(10):12-16.
[11]翟光明.中国石油地质志(卷十)—四川油气区[M].北京:石油工业出版社,1989:88-110.Zhai Guangming.Petroleum Geology of China(Vol.10)—SichuanOil Province[M].Beijing:Petroleum Industry Press,1989:88-110.
[12]李娟,于炳松,张金川,等.黔北地区下寒武统黑色页岩储层特征及其影响因素[J].石油与天然气地质,2012,33(3):364-374.Li Juan,Yu Bingsong,Zhang Jinchuan,et al.Reservoir characteristicsand their influence factors of the Lower Cambrian dark shale in nor-thern Guizhou[J].Oil&Gas Geology,2012,33(3):364-374.
[13]刘树根,马永生,蔡勋育,等.四川盆地震旦系-下古生界天然气成藏过程和特征[J].成都理工大学学报(自然科学版),2009,36(4):345-3541.Liu Shugen,Ma Yongsheng,Cai Xunyu,et al.Characteristic and ac-cumulation process of the natural gas from Sinian to Lower Paleozoicin Sichuan Basin,China[J].Journal of Chengdu University of Tech-nology:Sci&Technol Ed,2009,36(4):345-3541.
[14]张厚福,张万选.石油地质学(第二版)[M].北京:石油工业出版社,1989:129-131.Zhang Houfu,Zhang Wanxuan.Petroleum Geology(the second edi-tion)[M].Beijing:Petroleum Industry Press,1989:129-131.
[15]付秀清,王正东.石油地质学[M].北京:石油工业出版社,2009:86-88.Fu Xiuqing,Wang Zhengdong.Petroleum Geology[M].Beijing:Pe-troleum Industry Press,2009:86-88.
[16]江为为,刘伊克,郝天珧,等.四川盆地综合地质、地球物理研究[J].地球物理学进展,2001,16(1):11-23.Jiang Weiwei,Liu Yike,Hao Tianyao,et al.A study of geology andgeophysics of Sichuan basin,China[J].Progress in Geophysics,2001,16(1):11-23.
[17]宋洪彪,罗立志.四川盆地基底及深部地质结构研究的进展[J].地学前缘,1995,2(3-4):231-237.Song Hongbiao,Luo Lizhi.The study of the basement and deep geo-logical structures of Sichuan basin,China[J].Earth Science Fron-tiers,1995,2(3-4):231-237.
[18]袁玉松,孙冬胜,周雁,等.四川盆地川东南地区“源-盖”匹配关系研究[J].地质论评.2010,56:831-838.Yuan Yusong,Sun Dongsheng,Zhou Yan,et al.Relationship betweenhydrocarbon generation history of source rocks and sealing history ofmudstone cap-rocks in the southeast Sichuan Basin[J].GeologicalReview,2010,56:831-838.
[19]高波,沃玉进,周雁,等.贵州麻江古油藏成藏期次[J].石油与天然气地质,2012,33(3):417-423.Gao Bo,Wo Yujin,Zhou Yan,et al.Hydrocarbon accumulation pha-ses of Majiang paleo-oil reservoir in Guizhou[J].Oil&Gas Geology,2012,33(3):417-423.
[20]何治亮,汪新伟,李双建,等.中上扬子地区燕山运动及其对油气保存的影响[J].石油实验地质,2011,33(1):1-11.He Zhiliang,Wang Xinwei,Li Shuangjian,et al.Yanshan Movementand its influence on petroleum preservation in Middle-Upper Yangtzeregion[J].Petroleum Geology&Experiment,2011,33(1):1-11.
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