Characteristics and evolution of fault rocks in carbonate fault zone: a case study of the Lower Paleozoic in Chezhen sag of Jiyang depression, Bohai Bay Basin

doi:10.7623/syxb202105003

Acta Petrolei Sinica ›› 2021, Vol. 42 ›› Issue (5): 588-597.DOI: 10.7623/syxb202105003

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Characteristics and evolution of fault rocks in carbonate fault zone: a case study of the Lower Paleozoic in Chezhen sag of Jiyang depression, Bohai Bay Basin

Liu Peng^1,2, Wang Yongshi³, Song Mingshui³, Liu Yali¹, Wang Min¹, Zhang Shun¹, Wang Tongda¹

1. Research Institute of Petroleum Exploration and Development, Sinopec Shengli Oilfield Company, Shandong Dongying 257022, China;
2. Postdoctor Scientific Research Station, Sinopec Shengli Oilfield Company, Shandong Dongying 257000, China;
3. Sinopec Shengli Oilfield Company, Shandong Dongying 257000, China

Received:2020-05-08 Revised:2020-10-28 Online:2021-05-25 Published:2021-06-05

碳酸盐岩断裂带断层岩特征及演化——以渤海湾盆地济阳坳陷车镇凹陷下古生界为例

刘鹏^1,2, 王永诗³, 宋明水³, 刘雅利¹, 王敏¹, 张顺¹, 王彤达¹

1. 中国石油化工股份有限公司胜利油田分公司勘探开发研究院山东东营 257022;
2. 中国石油化工集团公司胜利油田博士后科研工作站山东东营 257000;
3. 中国石油化工股份有限公司胜利油田分公司山东东营 257000

通讯作者: 刘鹏,男,1987年9月生,2010年获中国石油大学(华东)学士学位,2016年获中国石油大学(华东)博士学位,现为中国石油化工股份有限公司胜利油田分公司勘探开发研究院助理研究员,主要从事断裂带结构及其控藏方面的研究。
作者简介:刘鹏,男,1987年9月生,2010年获中国石油大学(华东)学士学位,2016年获中国石油大学(华东)博士学位,现为中国石油化工股份有限公司胜利油田分公司勘探开发研究院助理研究员,主要从事断裂带结构及其控藏方面的研究。Email:lpupc1987@163.com
基金资助:
国家科技重大专项（2016ZX05006）、中国石油化工股份有限公司胜利油田分公司博士后课题（K27）和中国石油化工股份有限公司胜利油田分公司课题（YKK1910）资助。

Abstract

Abstract: The fault rock in the carbonate fracture zone has complex composition and strong heterogeneity; its formation and evolution control the migration and accumulation of oil and gas, and also have an important influence on the reformation of carbonate reservoirs. Using seismic, core and thin section data, this paper analyzes the characteristics and deformation mechanism of the Lower Paleozoic carbonate fault rocks in Chezhen sag of the Bohai Bay Basin, and also establishes an evolution model of fault rocks in the carbonate fracture zone. In the Lower Paleozoic carbonate fault zone of Chezhen sag, there are two types of fault rocks:fault breccia and ultracataclasite. Among them, fault breccia includes crackle breccia, mosaic breccia and chaotic breccia. The cataclasite type includes cataclasite and ultracataclasite. The fault breccia is mainly composed of centimeter- and millimeter-level angular and subangular limestone debris. The debris is very poorly sorted, supported by grains, with the cement content of less than 50%. The cataclastic limestone debris is mostly smaller than 2 mm in diameter, with the cement content of more than 50%, shown as basal cement. The deformation mechanism of fault breccia is dominated by fracturing, while that of cataclasite is mainly controlled by cataclasis. For fault rock, as the distance from the main slip plane increases, the degree of deformation gradually increases, and it is evolved from fault breccia to cataclasite. The fault rock has undergone a spatio-temporal evolution sequence of "crackle breccia-mosaic breccia-chaotic breccia-cataclasite-ultracataclasite".

Key words: carbonate rock, fault zone, characteristics of fault rock, deformation mechanism, evolution of fault rock

摘要： 碳酸盐岩断裂带断层岩成分复杂、非均质性强，其形成演化对碳酸盐岩储层改造和油气运聚具有重要影响。利用地震、岩心和岩石薄片资料对渤海湾盆地济阳坳陷车镇凹陷下古生界碳酸盐岩断层岩特征及其变形机制进行分析，建立了碳酸盐岩断裂带断层岩演化模式。车镇凹陷下古生界碳酸盐岩断裂带发育断层角砾岩和碎裂岩两类断层岩，其中，断层角砾岩类包括裂纹角砾岩、镶嵌角砾岩和杂乱角砾岩，碎裂岩类包括碎裂岩和超碎裂岩。断层角砾岩主要由厘米—毫米级的棱角状—次棱角状灰岩碎屑组成，碎屑分选性极差，呈颗粒支撑，胶结物含量小于50%；碎裂岩灰岩碎屑多小于2 mm，胶结物含量多大于50%，为基底式胶结。断层角砾岩变形机制以破裂作用为主，而碎裂岩变形机制以碎裂作用为主。随着与主滑动面的距离增加，断层岩变形程度逐渐增强，由断层角砾岩演变为碎裂岩，断层岩经历了"裂纹角砾岩→镶嵌角砾岩→杂乱角砾岩→碎裂岩→超碎裂岩"的时空演化序列。

关键词: 碳酸盐岩, 断裂带, 断层岩特征, 变形机制, 断层岩演化

CLC Number:

TE122

Liu Peng, Wang Yongshi, Song Mingshui, Liu Yali, Wang Min, Zhang Shun, Wang Tongda. Characteristics and evolution of fault rocks in carbonate fault zone: a case study of the Lower Paleozoic in Chezhen sag of Jiyang depression, Bohai Bay Basin[J]. Acta Petrolei Sinica, 2021, 42(5): 588-597.

刘鹏, 王永诗, 宋明水, 刘雅利, 王敏, 张顺, 王彤达. 碳酸盐岩断裂带断层岩特征及演化——以渤海湾盆地济阳坳陷车镇凹陷下古生界为例[J]. 石油学报, 2021, 42(5): 588-597.

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Characteristics and evolution of fault rocks in carbonate fault zone: a case study of the Lower Paleozoic in Chezhen sag of Jiyang depression, Bohai Bay Basin

碳酸盐岩断裂带断层岩特征及演化——以渤海湾盆地济阳坳陷车镇凹陷下古生界为例

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