珠江口盆地恩平凹陷古近系恩平组物源体系及其对滩坝的控制

doi:10.7623/syxb201503004

石油学报 ›› 2015, Vol. 36 ›› Issue (3): 286-299.DOI: 10.7623/syxb201503004

珠江口盆地恩平凹陷古近系恩平组物源体系及其对滩坝的控制

刘强虎^1,2, 朱红涛², 舒誉³, 朱筱敏¹, 杨香华², 付鑫²

1. 中国石油大学油气资源与探测国家重点实验室中国石油大学地球科学学院北京 102249;
2. 中国地质大学构造与油气资源教育部重点实验室中国地质大学资源学院湖北武汉 430074;
3. 中海石油(中国)有限公司深圳分公司广东深圳 510240

收稿日期:2014-09-21 修回日期:2014-12-31 出版日期:2015-03-25 发布日期:2015-03-11
通讯作者: 朱红涛,男,1976年9月生,2000年获中国地质大学(武汉)石油天然气地质专业学士学位,2005年获中国地质大学(武汉)矿产普查与勘探专业博士学位,现为中国地质大学(武汉)资源学院教授、博士生导师,主要从事石油天然气地质学的教学和科研工作。Email:htzhu@cug.edu.cn
作者简介:刘强虎,男,1988年3月生,2010年获长江大学学士学位,2013年获中国地质大学(武汉)硕士学位,现为中国石油大学(北京)地球科学学院博士研究生,主要从事层序地层学及地震沉积学研究。Email:lqhchkd@163.com
基金资助:
国家重大科技专项(2011ZX05023-001-015,2011ZX05025-005-02)和霍英东教育基金会高等院校青年教师基金应用研究课题项目(132020)资助

Provenance systems and their control on the beach-bar of Paleogene Enping Formation, Enping sag,Pearl River Mouth Basin

Liu Qianghu^1,2, Zhu Hongtao², Shu Yu³, Zhu Xiaomin¹, Yang Xianghua², Fu Xin²

1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum; College of Geosciences, China University of Petroleum, Beijing 102249, China;
2. Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education, China University of Geosciences; Faculty of Earth Resources, China University of Geosciences, Hubei Wuhan 430074, China;
3. Shenzhen Branch, CNOOC China Limited, Guangdong Shenzhen 510240, China

Received:2014-09-21 Revised:2014-12-31 Online:2015-03-25 Published:2015-03-11

摘要/Abstract

摘要：

以珠江口盆地恩平凹陷恩平组为研究对象,在有限井控下,基于岩屑、薄片、锆石等测试资料及地球物理响应资料,综合分析研究区恩平组三级层序格架(SQ1—SQ3)内物源及其控制下滩坝沉积体系特征。采用古地貌宏观区分物源区与沉积区,运用岩屑组成及阴极发光特征明确沉积区原始物质成分,通过碎屑锆石U-Pb定年精细拾取年龄分布特征,从不同角度、层次进行物源示踪分析;同时,依据单井相、地震反射特征与多属性聚类分析刻画盆内的滩坝沉积体系特征。研究表明,研究区在恩平组沉积期发育古生代变质岩与中生代火成岩为主、元古代变质岩为辅的复合物源体系,SQ1—SQ3沉积期,北部3条大型断槽输导物源强度递增;滩坝的物源供应模式由SQ1沉积期的基岩-滩坝沉积体系向SQ3沉积期的辫状河三角洲-滩坝沉积体系转化,滩坝含砂率与含砾率递减,连片性变差,范围减小。

关键词: 物源示踪, 滩坝沉积体系, 锆石U-Pb年龄, 地震多属性, 恩平组, 恩平凹陷

Abstract:

Taking Enping Formation of Enping Depression in Pearl River Mouth Basin as research object, based on debris, slices, zircon and other test data as well as geophysical response data under finite well control, the provenances of three order Sequence Framework (SQ1—SQ3) of Enping Formation in the study area are comprehensively analyzed together with characteristics of the controlled beach-bar sedimentary systems. The paleo-geomorphology is used to divide the provenance area and sedimentary area from a macroscopic perspective. The prime material components in sedimentary area are identified based on debris compositions and cathodoluminescence characteristics. The age distribution characteristics were determined precisely through debris zircon U-Pb dating, while the source tracing analysis is conducted from difference perspectives and levels. Meanwhile, the characteristics of beach-bar sedimentary system within the basin are described based on single well facies, seismic reflection characteristics and multi-attribute cluster analysis. The results indicate that a complex provenance system was formed in Enping Formation of the study area during the sedimentary period, i.e., dominated by Paleozoic metamorphic rocks and Mesozoic igneous rocks, and supplemented by Proterozoic metamorphic rocks. From SQ1 to SQ3, the conductivity provenance intensities of three large faulted troughs in the north were enhanced gradually. The provenance supply mode of beach bar was transformed from bedrock-beach bar sedimentary system in SQ1 to the braided river delta-beach bar sedimentary system in SQ3. Moreover, the sand content and gravel content of beach bar decreased gradually, leading to poor continuity and small scope.

Key words: source tracing, beach bar-sedimentary system, zircon U-Pb ages, seismic multi-attribute, Enping Formation, Enping sag

中图分类号:

TE132.2

刘强虎, 朱红涛, 舒誉, 朱筱敏, 杨香华, 付鑫. 珠江口盆地恩平凹陷古近系恩平组物源体系及其对滩坝的控制[J]. 石油学报, 2015, 36(3): 286-299.

Liu Qianghu, Zhu Hongtao, Shu Yu, Zhu Xiaomin, Yang Xianghua, Fu Xin. Provenance systems and their control on the beach-bar of Paleogene Enping Formation, Enping sag,Pearl River Mouth Basin[J]. Acta Petrolei Sinica, 2015, 36(3): 286-299.

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珠江口盆地恩平凹陷古近系恩平组物源体系及其对滩坝的控制

Provenance systems and their control on the beach-bar of Paleogene Enping Formation, Enping sag,Pearl River Mouth Basin

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