尼日尔三角洲泥底辟形成控制因素及构造演化模式  

Controlling Factors and Tectonic Evolution Patterns of Mud Diapir in the Niger Delta

作　　者：雷雨婷 李江海[1,2,3] 王殿举 杨梦莲 Lei Yuting;Li Jianghai;Wang Dianju;Yang Menglian(Key Laboratory of Orogenic Belts and Crustal Evolution of Ministry of Education (Peking University),Beijing 100871,China;Peking University,Beijing 100871,China;Institute of Oil & Gas,Peking University,Beijing 100871,China)

机构地区：[1]造山带与地壳演化教育部重点实验室,北京100871 [2]北京大学,北京100871 [3]北京大学石油与天然气研究中心,北京100871

出　　处：《特种油气藏》2019年第5期44-50,共7页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“重点盆地油气富集规律与目标评价”(2016ZX05033002-007)

摘　　要：尼日尔三角洲盆地是大西洋扩张过程中形成的典型被动大陆边缘型盆地,内部发育大量泥底辟构造,因蕴藏丰富的油气资源而成为西非油气勘探的重要潜力区。基于大西洋地质构造演化背景及尼日尔三角洲盆地相关地质研究,针对泥底辟形成的控制因素和泥底辟构造演化模式问题,运用控制变量法和二维离散元模拟手段,得出一定的地层倾角会促进泥岩在三角洲末端大量堆积,同时隆起的新生洋壳可阻碍大套泥岩向海运移,两者综合促进了该区泥底辟的发育。该研究对中国沿海盆地泥底辟构造的认识具有一定的参考意义。The Niger Delta Basin is a typical passive continental marginal basin developed during the expansion of the Atlantic Ocean and there is a large amount of mud diapir structure within the basin.The Niger Delta Basin has become an important potential area for the hydrocarbon exploration in West Africa due to its rich hydrocarbon resources.Based on the Atlantic geology evolution setting and the Niger Delta Basin geology,the control variate method and 2D discrete element simulation were used to analyze the controlling factors and tectonic evolution patterns of mud diapir.It is concluded that the dip angle and uplifting new oceanic crust are favorable to the development of diapir.This research could provide certain reference for the understanding of mud diapir structures in coast basins of China.

关 键 词：泥底辟 离散元模拟 尼日尔三角洲 主控因素 演化模式 

分 类 号：TE122.2[石油与天然气工程—油气勘探]