珠江口盆地古近系幕式构造活动与沉积耦合关系——以长昌—鹤山凹陷为例

发布时间：2018-04-16 01:13

本文选题：多幕式裂陷 + 构造与沉积耦合关系　；参考：《断块油气田》2016年03期

【摘要】：长昌—鹤山凹陷位于珠江口盆地,具有良好的勘探前景。通过对区域性角度不整合、断裂幕式活动、构造沉降阶段性演化以及古构造格架变化等信息的综合分析,揭示了长昌—鹤山凹陷古近纪构造具有分期异向多幕式裂陷特征,且在不同构造幕,地层沉积受断裂控制作用不同,形成的沉积体系空间展布和配置关系明显不同。主要表现在:早期裂陷幕,沉积地层完全受断层控制,断陷活动强烈,主要发育扇三角洲物源;晚期裂陷幕,断陷活动大大减弱,主要发育近源辫状河三角洲,且该时期圈闭较发育;断拗转换幕,沉积地层分层发育,早期地层完全受断层控制,主要发育浅海三角洲,晚期沉积部分受断层控制,开始接受海相沉积,陆架边缘三角洲伴随陆架不断向海迁移,陆坡的坡度逐渐变陡,开始发育重力流深水扇。
[Abstract]:Changchang-Heshan depression is located in the Pearl River mouth basin and has a good prospect for exploration.Based on the comprehensive analysis of the information of regional unconformity, fault-curtain activity, tectonic subsidence evolution and paleotectonic framework change, it is revealed that the Paleogene structure of Changchang-Heshan sag has the characteristics of multi-stage and multi-episode rifting.In different tectonic episodes, the stratigraphic deposits are controlled by faults, and the spatial distribution and configuration of the sedimentary systems are obviously different.The main features are as follows: early rifting, sedimentary strata completely controlled by fault, strong fault activity, mainly developed fan delta provenance, late rifting curtain, fault subsidence activity greatly weakened, mainly developed near source braided river delta,In this period, the traps are relatively developed, the fault-sag transition curtain, the stratification of sedimentary strata are developed, the early strata are completely controlled by faults, the shallow sea deltas are mainly developed, the late sedimentary parts are controlled by faults, and the marine sediments begin to be accepted.With the continental shelf moving to the sea, the slope of the continental slope gradually steeped, and the gravity flow deep-water fan began to develop.
【作者单位】：中国石油大学(北京)油气与资源探测国家重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金项目“分期异向分层伸展断裂系统叠加过程模拟研究:以渤海湾盆地南堡凹陷为例”(41472116) 中海油横向科研项目“南海东部超深水盆地(长昌—鹤山凹陷)构造-沉积充填综合研究”(GC2014ZC2393)
【分类号】：P618.13

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