Lithology characteristics,genesis and reservoir significance of metamorphic rocks in the Archean buried hill of Bozhong sag,Bohai Bay Basin:case studies of Bozhong19-6 structural area and Anziling area

doi:10.7623/syxb202502003

Acta Petrolei Sinica ›› 2025, Vol. 46 ›› Issue (2): 320-334.DOI: 10.7623/syxb202502003

Lithology characteristics,genesis and reservoir significance of metamorphic rocks in the Archean buried hill of Bozhong sag,Bohai Bay Basin:case studies of Bozhong19-6 structural area and Anziling area

Liu Pengcheng¹, Lü Dingyou², Yi Jian¹, Shan Xuanlong¹, Zhang Jinrui¹, Liu Xiaojian², Gao Fuhong¹, Wang Wei², Ren Shuyue¹, Xu Hongjie³

1. College of Earth Sciences, Jilin University, Jilin Changchun 130012, China;
2. Tianjin Branch, CNOOC China Limited, Tianjin 300452, China;
3. Exploration and Development Research Institute, Northeast Oil and Gas Branch of Sinopec, Jinlin Changchun 130062, China

Received:2023-11-20 Revised:2024-05-25 Online:2025-03-13 Published:2025-03-13

渤海湾盆地渤中凹陷太古宇潜山变质岩的岩性特征、成因及储层意义——以渤中19-6构造区和安子岭地区为例

刘鹏程¹, 吕丁友², 衣健¹, 单玄龙¹, 张晋瑞¹, 刘晓健², 高福红¹, 王蔚², 任淑悦¹, 徐宏节³

1. 吉林大学地球科学学院吉林长春 130012;
2. 中海石油(中国)有限公司天津分公司天津 300452;
3. 中国石油化工股份有限公司东北油气分公司勘探开发研究院吉林长春 130062

通讯作者: 单玄龙,男,1969年2月生,1998年获长春科技大学博士学位,现为吉林大学地球科学学院院长、教授、博士生导师,主要从事非常规油气地质方面的教学与科研工作。Email:shanxl@jlu.edu.cn
作者简介:刘鹏程,男,1994年7月生,2016年获长安大学学士学位,现为吉林大学地球科学学院博士研究生,主要从事盆地火山岩、变质岩油气藏等研究工作。Email:liupc20@mails.jlu.edu.cn
基金资助:
中海石油(中国)有限公司"七年行动计划"科技重大专项"渤海油田上产4000万吨新领域勘探关键技术"(CNOOC-KJ135ZDXM 36TJ08TJ)资助。

Abstract

Abstract: Lithology is an important internal factor controlling the development of metamorphic reservoirs in Archean buried hill. To clarify the lithologic development regularity and genetic mechanism of metamorphic rock in the Archean buried hill of Bozhong sag, this paper carries out mineral determination, identification of lithology logging response, comparison of connected wells and characterization of metamorphic rock distribution in Bozhong19-6 structural area, which are further compared with the Archean metamorphic rocks in Anziling area on the northern margin of Bohai Bay Basin. The results indicate that the types, formation time, and distribution patterns of metamorphic rocks in Bozhong19-6 structural area are similar to those in Anziling area. To be specific, the early Archean trondhjemite, tonalite and granodiorite (TTG) lithological assemblage underwent different migmatitization to form migmatitic granite, migmatitic gneiss, and gneiss. These metamorphic rocks are regularly distributed in a ring-like pattern, and the migmatitization gradually decreases from inner to outside. It is believed that the Archean metamorphic rocks in the Bozhong19-6 structural area originated from the TTG formed by deep melting of the basic crust under the background of mantle plume at about 2.5 Ga ago. TTG further underwent extensive migmatitization to form regularly distributed migmatite and dome structure, and experienced multiple periods of strong tectonic activities such as Indosinian, Yanshan and Himalayan in the later period, finally forming the current lithologic distribution pattern. Migmatitic granite is more prone to fracture and form fractures under stress, which is favorable for reservoir formation.

Key words: Bohai Bay Basin, Bozhong sag, Bozhong19-6 structure, Anziling area, buried hill reservoir, migmatite, metamorphic rock dome

摘要： 岩性是控制太古宇潜山变质岩储层发育的重要内因,为明确渤海湾盆地渤中凹陷太古宇潜山变质岩的岩性发育规律及成因机理,对渤中19-6构造区的变质岩开展了岩矿鉴定、测井识别、连井对比和平面分布刻画,并与渤海湾盆地北缘安子岭地区太古宇变质岩进行了对比分析。研究结果表明:渤中19-6构造区变质岩的岩石类型、形成时间和分布规律与安子岭地区相似,表现为早期的太古宇奥长花岗岩、英云闪长岩和花岗闪长岩(TTG)岩性组合经历了不同程度的混合岩化作用,形成混合花岗岩、混合片麻岩和片麻岩;变质岩呈环带状规律分布,由内至外混合岩化程度逐渐降低;渤中19-6构造区的太古宇变质岩起源于距今约2.5 Ga地幔柱背景下由基性地壳深熔形成的TTG岩系,TTG岩系进一步发生广泛混合岩化,形成规律分布的混合岩和穹窿构造,后期又经历了印支期、燕山期、喜马拉雅期多期强构造活动改造,最终形成现今的岩性分布格局;混合花岗岩在应力作用下更易破裂形成裂缝,有利于形成储层。

关键词: 渤海湾盆地, 渤中凹陷, 渤中19-6构造, 安子岭地区, 潜山油气藏, 混合岩, 变质岩穹窿

CLC Number:

TE122.2

Liu Pengcheng, Lü Dingyou, Yi Jian, Shan Xuanlong, Zhang Jinrui, Liu Xiaojian, Gao Fuhong, Wang Wei, Ren Shuyue, Xu Hongjie. Lithology characteristics,genesis and reservoir significance of metamorphic rocks in the Archean buried hill of Bozhong sag,Bohai Bay Basin:case studies of Bozhong19-6 structural area and Anziling area[J]. Acta Petrolei Sinica, 2025, 46(2): 320-334.

刘鹏程, 吕丁友, 衣健, 单玄龙, 张晋瑞, 刘晓健, 高福红, 王蔚, 任淑悦, 徐宏节. 渤海湾盆地渤中凹陷太古宇潜山变质岩的岩性特征、成因及储层意义——以渤中19-6构造区和安子岭地区为例[J]. 石油学报, 2025, 46(2): 320-334.

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Lithology characteristics,genesis and reservoir significance of metamorphic rocks in the Archean buried hill of Bozhong sag,Bohai Bay Basin:case studies of Bozhong19-6 structural area and Anziling area

渤海湾盆地渤中凹陷太古宇潜山变质岩的岩性特征、成因及储层意义——以渤中19-6构造区和安子岭地区为例

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