基于构造变形约束的川东寒武系膏盐层分布<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2019.05.056

古地理学报 ›› 2019, Vol. 21 ›› Issue (5): 825-834. doi: 10.7605/gdlxb.2019.05.056

• 构造古地理学及古构造 • 上一篇下一篇

基于构造变形约束的川东寒武系膏盐层分布^*

梁瀚¹, 马波¹, 肖柏夷², 何青林¹

1 中国石油西南油气田公司勘探开发研究院, 四川成都 610041;
2 中国石油西南油气公司勘探事业部, 四川成都 610041

收稿日期:2018-11-08 修回日期:2019-05-14 出版日期:2019-10-01 发布日期:2019-09-26
作者简介:梁瀚,男,1982年生,博士,高级工程师,主要从事石油地质与构造地质研究。通讯地址: 四川省成都市高新区天府大道北段12号。E-mail: lianghan01@petroChina.com.cn。
基金资助:
*国家科技重大专项(编号:2016ZX05007-004),中国石油天然气集团有限公司重大科技专项(编号: 2016E-0604)联合资助

Assessment on distribution of the Cambrian evaporites affected by structural deformation in eastern Sichuan Basin

Liang Han¹, Ma Bo¹, Xiao Bo-Yi², He Qing-Lin¹

1 Exploration and Development Research Institute of Southwest Oil & Gas Field Company,PetroChina, Chengdu 610041,China;
2 Exploration Division of Southwest Oil & Gas Field Company, PetroChina, Chengdu 610041, China

Received:2018-11-08 Revised:2019-05-14 Online:2019-10-01 Published:2019-09-26
About author:Liang Han,born in 1982,is a senior engineer. Now he is engaged in research of petroleum geology and structural geology. E-mail: lianghan01@petroChina.com.cn.
Supported by:
Co-funded by National Science and Technology Major Project of China (No. 2016ZX05007-004) and Science and Technology Major Project of CNPC(No.2016E-0604)

摘要/Abstract

摘要： 四川盆地东部广泛沉积一套寒武纪潟湖相的云质膏盐层,盐下的地层及其构造是四川盆地新的油气勘探突破点。该地区高陡构造变形非常复杂,而且钻到该套膏盐层的钻井少,其构造变形特征和分布范围不清,难以落实构造圈闭和优质储集层的分布。通过地震地质综合研究,基于盐构造的构造变形特征和膏盐层的地震响应特征,开展了四川盆地东部寒武系膏盐层的构造变形及分布范围研究。该套膏盐层作为底部滑脱层引发川东形成薄皮构造,发育隔档式褶皱。隔挡式构造模式与寒武系膏盐层的盐构造变形为正相关关系,寒武系膏盐层是该地区构造格局的主控因素,亦是隔档式构造形成的必要条件。利用膏盐岩的岩石力学性质和对构造的控制作用,结合地震反射特征,预测了寒武系膏盐盆在平面上的展布:其西边界沿华蓥山构造边界延伸,向北沿水口厂构造展布直到大巴山前,往南沿川南低陡构造带西边界向南西展布。寒武纪膏盐盆的沉积中心在方斗山沿北东—南西向一线。

关键词: 川东, 高陡构造, 盐构造, 滑脱褶皱, 多滑脱层, 构造样式

Abstract: The widely spread Cambrian Lagoon salt in eastern Sichuan Basin makes the tectonic belts of Lower Paleozoic-Sinian system become a great potential of oil and gas exploration. However, due to the complicated high-steep structural deformation and the limited drilling information, the characteristics of structural deformation is not clear, making it difficult to predict the distribution of structural trapping and favorable reservoirs. Based on the comprehensive analysis on seismogeology to obtain the seismic response characteristics of salt structures and evaporites, the structural deformation and distribution of Cambrian evaporites in eastern Sichuan Basin have been investigated in this paper. As the most essential detachment, the Cambrian salt layer caused the development of thin-layered structure in eastern Sichuan, can be regarded as the isolated fold. The isolated structural mode is positively correlated with the salt structural deformation of Cambrian salt layer, which is the dominated structural characteristics in this area, establishing the structural deformation mode of this area. Based on the rock mechanics of salt layer which is controlled by faults, together with the seismic reflection characteristics, the distribution of the Cambrian salt has been predicted, presenting that it is bounded by the Huayingshan belt to the west, and extends to the Daba Mountain Front along the Shuikouchang tectonic belt to the north, and extends to southwestern direction along the southern Sichuan low steep tectonic belt to the south. The Cambrian depositional center is located along the northeast to southwest direction of the Fangdou mountain.

Key words: eastern Sichuan Basin, high and steep structures, salt structures, detachment folds, multiple detachments, structural style

中图分类号:

梁瀚, 马波, 肖柏夷, 何青林. 基于构造变形约束的川东寒武系膏盐层分布^*[J]. 古地理学报, 2019, 21(5): 825-834.

Liang Han, Ma Bo, Xiao Bo-Yi, He Qing-Lin. Assessment on distribution of the Cambrian evaporites affected by structural deformation in eastern Sichuan Basin[J]. JOPC, 2019, 21(5): 825-834.

http://www.gdlxb.cn/CN/Y2019/V21/I5/825

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