三角洲前缘浊积体成因及分布规律研究

GENESIS AND DISTRIBUTION REGULARITY OF THE TURBIDITE BODIES IN THE DELTA FRONT

鄢继华 陈世悦 姜在兴

Yan Jihua Chen Shiyue Jiang Zaixing

中国石油大学, 地球资源与信息学院, 山东, 东营, 257061 2. 中国地质大学, 能源地质系, 北京, 100083

College of Earth Resources and Information, China University of Petroleum, Dongying, Shandong 257061, China 2. Department of Energy Geology, China University of Geosciences, Beijing 100083, China

在室内水槽模拟实验的基础上,系统分析了三角洲前缘浊积体的形成机制、分布规律及控制因素.三角洲前缘浊积体的形成过程可概括为滑塌前的沉积物积累、触发机制作用、沉积物的二次搬运和浊积体的最终沉积4个阶段.多种成因机制综合分析表明,浊积体主要分布在三角洲前缘至深水区之间的4个有利区带内,其分布具有明显的分带性.三角洲前缘深水洼陷区沉积的与地震作用相关的二级滑塌浊积体是最有利的岩性油气藏类型之一.触发机制、三角洲前缘沉积物组成及特征、前三角洲地区沉积底形形态、盆地水体深度以及水平面的升降、沉积物供应通量等因素都在不同方面直接或间接地影响到了浊积砂体的形成和分布.

The forming mechanisms,the distribution regularities and the controlling factors of the turbidite bodies in the delta front are analyzed systematically based on the in-door flume experiment simulation results.The forming process of the turbidite bodies can be classified into four stages,e.g.the sediment accumulation before slumping,the triggering action,the secondary transportation of sediments and the final deposition of turbidite bodies.The comprehensive analysis results of various genetic mechanisms indicate that the turbidities mainly distribute in four favorable zones between the delta front and the deep water area with apparent zonality.The secondary slumping turbidities associated to the earthquakes and developed in the deep-water depression are one of the most favorable lithological hydrocarbon reservoir types.The main controlling factors of the turbidities in the delta front include the triggering mechanism,the component and the characteristics of the sediments,the bed shape of the prodelta,the water depth,the elevation and subsidence of the water level,and the supply of the sediments,which all affect,directly or indirectly,the formation and the distribution of the turbidite bodies in different aspects.

国家十五科技攻关项目(2001BA605A09)

https://doi.org/10.11781/sysydz200801016