| 珠江口盆地白云凹陷文昌组构造?沉积响应关系 |
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| 引用本文： | 郭伟,徐国强,柳保军,向绪洪,刘冬青,张博.珠江口盆地白云凹陷文昌组构造?沉积响应关系[J].地球科学,2022,47(7):2433-2453. |
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| 作者姓名： | 郭伟 徐国强 柳保军 向绪洪 刘冬青 张博 |
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| 作者单位： | 1.中海石油(中国)有限公司深圳分公司, 广东深圳 518054 |
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| 基金项目： | 国家科技重大专项2016ZX05026?003 |
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| 摘 要： | 为揭示白云凹陷文昌组构造演化与沉积充填间的耦合关系，基于三维地震数据和钻井、测井资料，采用层序原形结构剖面恢复、增强地震相分析、砂体地震扫描解释等新方法，对白云凹陷文昌组构造演化及其控制下的沉积充填过程进行了详细研究. 研究表明，响应于控凹断层“弱?极强?较强?弱”的活动过程，文昌组沉积期白云凹陷经历了初始断陷期（WCSQ1）、强断陷早期（WCSQ2）、强断陷晚期（WCSQ3）和弱断陷期（WCSQ4、WCSQ5）4个构造演化阶段. 相应地，白云主洼经历了河流?湖泊、超深湖发生、超深湖充填、深湖?浅湖发生等沉积演化过程. 其中旋转断块翘倾侧的北部缓坡带主要为河流?浅湖过渡环境，发育大?中型辫状河三角洲沉积体系；断块倾没侧的南部陡坡带主要为半深湖?深湖环境，发育近岸水下扇?扇三角洲沉积体系；湖盆中心为深湖?超深湖环境，以泥岩沉积为主，深湖区周缘发育湖底扇沉积；同时期白云东洼为陡坡+岩浆底侵形成的多隆洼地貌，以小型近岸水下扇?扇三角洲沉积体系为主，局部发育火山碎屑沉积. 文昌组沉积砂体的孔隙性受白云凹陷控凹断裂和岩浆的活动强度、物源体系及次级洼陷古地理特征等因素共同控制.
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| 关 键 词： | 断陷湖盆 伸展构造 构造演化 沉积体系 沉积充填演化 文昌组 白云凹陷 海洋地质学 |
| 收稿时间： | 2021-09-26 |
Structure-Sedimentary Response Relationship of Wenchang Formation in Baiyun Sag,Pearl River Mouth Basin |
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| Abstract: | Based on 3D seismic data, drilling and logging data, the tectonic evolution and its controlled sedimentary filling process of Wenchang Formation in Baiyun Sag were studied in detail by using new methods such as the restoration of original form structure section, enhanced seismic facies analysis and seismic scanning interpretation of sand body in order to explore the structure-sedimentary response relationship of faulted lake basin. The study shows that in response to the activity process of "weak-very strong-relatively strong-weak" of sag-controlling faults, Baiyun Sag experienced four tectonic evolution stages during the Wenchang Formation: initial fault depression stage (WCSQ1), early stage of strong fault depression (WCSQ2), late stage of strong fault depression (WCSQ3) and weak fault depression stage (WCSQ4, WCSQ5). Correspondingly, Baiyun Main Sag underwent the sedimentary evolution processes of fluvial-lacustrine, ultra-deep lake occurrence, ultra-deep lake filling, deep lake-shallow lake occurrence. The northern gentle slope zone located on the tilting side of rotating fault block mainly developed a fluvial-shallow lake transitional environment and a braided river delta depositional system of large-medium scale. The southern steep slope zone located on the plunging side of rotating fault block mainly developed a semi-deep lacustrine to deep lacustrine environment and a nearshore subaqueous fan-fan delta depositional system. The center of lake basin mainly developed a deep lake-ultra-deep lake environment and argillaceous deposits. The deposits of turbidite fan were developed around the deep lake. However, the Baiyun East Sag appeared as a landform of multiple uplift-depression formed by steep slope and magmatic underplating, and mainly developed small-scale inshore subaqueous fan-fan delta sedimentary system with volcaniclastic sediments. The porosity of sand bodies of Wenchang Formation was jointly controlled by the activity intensity of sag-controlling faults and magma, provenance system and paleogeographic characteristics of secondary depressions in Baiyun Sag. |
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