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珠江口盆地开平凹陷构造沉降史及其主控因素

作    者:聂国权1,2,何登发3,李小盼1,2,张志业4,何 敏5
单    位:1 中国地质科学院岩溶地质研究所;2 自然资源部广西岩溶动力学重点实验室; 3 中国地质大学(北京)能源学院;4 中国石化河南油田分公司;5 中海石油(中国)有限公司深圳分公司
基金项目:本文受国家重点研发计划“古潜山和深部岩溶热储分布规律与成因机制”等联合资助
摘    要:
为探究珠江口盆地开平凹陷构造沉降特征以及主控因素,以两条地震剖面的最新解释成果为基础,在地震 剖面上共选取43个虚拟井进行构造沉降史计算,并进行综合分析。结果表明:①开平凹陷裂陷期(49~30Ma)构造沉 降量较大,各洼陷构造沉降差异性较大;裂后期(30Ma至今)构造沉降量相对较小,各洼陷构造沉降差异性较小;②开 平凹陷文昌组沉积期(裂陷一幕,49~39Ma)为最大构造沉降期,恩平组沉积期(裂陷二幕,39~30Ma)构造沉降速率显 著减小,漂移期(30~17.5Ma)和新构造运动期(17.5Ma之后)构造沉降量均出现了不同程度的增大;③差异性沉降是开 平凹陷的一个基本特征,多期次构造运动和拆离断层分段性、差异性活动是主控因素。
关键词:构造沉降;差异性;主控因素;开平凹陷;珠江口盆地

Tectonic subsidence and its main controlling factors of Kaiping Sag in Pearl River Mouth Basin

Author's Name: NIE Guoquan, HE Dengfa, LI Xiaopan, ZHANG Zhiye, HE Min
Institution: 
Abstract:
In order to study the characteristics of tectonic subsidence and its main controlling factors of Kaiping Sag in Pearl River Mouth Basin, based on the latest interpretation results of two seismic sections, 43 virtual wells were selected on the two seismic sections to calculate the tectonic subsidence and conduct a comprehensive analysis. The results show that: (1) The tectonic subsidence of Kaiping Sag is large at the rifting stage (49~30 Ma), and the tectonic subsidence of each sag is quite different. The tectonic subsidence is relatively small at the post-rifting stage (30 Ma to present), and the differences of tectonic subsidence in each sub-sag are small. (2) The first episode of the rift stage (deposition period of Wenchang Formation, 49~39 Ma) was the period of maximum tectonic subsidence. The tectonic subsidence rate decreases significantly in the second episode of the rift stage(deposition period of Enping formation, 39~30 Ma). The tectonic subsidence increases in varying degrees in the drift period (30~17.5 Ma) and Neotectonic Movement period (after 17.5 Ma). (3) Differential subsidence is a basic feature of Kaiping sag, and the multi-stage tectonic movement and segmented and differential activities of detachment fault are the major factors of differential subsidence in Kaiping Sag.
Keywords: tectonic subsidence; difference; main controlling factors; Kaiping Sag; Pearl River Mouth Basin
投稿时间:2020-03-02  
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