延伸的弹性波阻抗反演在东非始新世深水沉积体系刻画中的应用  

Application of Extended Elastic Inversion in Illustrating the Eocene Deep Water Sediment System in Offshore East Africa

作　　者：鲁银涛 范国章 杨慧良[2] 史卜庆 冉伟民 孙辉 曹全斌 吕福亮 邵大力 LU Yintao;FAN Guozhang;YANG Huiliang;SHI Boqing;RAN Weimin;SUN Hui;CAO Quanbin;LÜFuliang;SHAO Dali(Petrochina Hangzhou Research Institute of Geology,Hangzhou 310023,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China;China National Oil and Gas Exploration and Development Company,Beijing 100031,China)

机构地区：[1]中国石油杭州地质研究院,杭州310023 [2]青岛海洋地质研究所,青岛266071 [3]中油国际有限公司,北京100071

出　　处：《中国造船》2019年第4期237-246,共10页Shipbuilding of China

摘　　要：东非鲁武马盆地始新世发育深水沉积体系具有内部结构复杂,横向、纵向变化快,非均质性强的特征,用常规波阻抗反演无法细致刻画储层的空间展布特征。在常规波阻抗反演的基础上,用延伸的弹性波阻抗反演方法,获取了岩性指示和流体指示数据体,能够精细刻画研究区域始新世深水沉积结构单元发育特征和有利储层空间分布特征。通过识别刻画,认为该沉积体系为自西向东发育的顺直型水道-朵叶体复合体,主要为发育水道、天然堤、朵叶体结构单元。水道复合体向东北方向弯曲后,末端的朵叶体复合体向东南方向弯曲,整体呈半圆形。可将该沉积体系细分为5期水道、2期朵叶体,北部由大型天然堤沉积限制,水道-朵叶体复合体自北向南迁移,侧向迁移、垂向叠加。水道和朵叶体结构单元是优质的油气储层,且受到底流改造后,细粒沉积被携带至沉积体系之外,储层物性更加优质,连通性更好。The eocene deep-water sediment system in Rovuma Basin,East Africa,is characterized by its complicated internal architecture.The deep-water sediment changes rapidly in both lateral and vertical directions,with great heterogeneity,and conventional impedance inversion could not fully illustrate their spatial distribution.Following conventional impedance inversion,extended elastic inversion(EEI)is used to acquire lithology indicator and fluid indicator seismic volumes,which could provide precise dataset for illustrating sediment elements and spatial distribution of deep-water sediment reservoirs in the study area.Five-stages of the channel and two-stages of the lobe could be identified,exhibiting lateral migration and vertical aggradation,while the north boundary is confined by huge levee sediment.The reservoir property has greatly improved by bottom current after reworking,with the fine sediment transported to the levee in the north area by the driven force.

关 键 词：东非鲁武马盆地 深水沉积 内部结构 延伸的弹性波阻抗反演 储层预测 

分 类 号：TE58[石油与天然气工程—油气田开发工程]