地震相控非线性随机反演在阿姆河盆地A区块碳酸盐岩储层预测中的应用  

Applications of facies-controlled nonlinear random inversion for carbonate reservoir prediction in Block A of Amu-darya Basin

作　　者：张志伟[1] 王春生[1] 林雅平[1] 周天伟[1] 黄捍东[2] 赵迪[2] 

机构地区：[1]中国石油勘探开发研究院中亚俄罗斯研究部,北京100083 [2]中国石油大学资源与信息学院,北京102249

出　　处：《石油地球物理勘探》2011年第2期304-310,163,共7页Oil Geophysical Prospecting

基　　金：国家科技重大专项--海外重点风险项目勘探综合配套技术(2008ZX05029)资助

摘　　要：文中针对阿姆河盆地A区块碳酸盐岩储层对纵波属性敏感的特性,以地质、测井信息为约束条件,通过拾取三维地震波的速度、有效振幅、频率等信息,应用地震相控非线性随机反演,对A区块主要目的层的储层分布特征进行了预测,获得以下认识:①阿姆河盆地A区块碳酸盐岩具层状反射特征,顶、底界为两组强反射,内部可以看到成层性较好、连续分布的反射波,碳酸盐岩储集空间主要以孔隙型为主,裂缝不发育,偶见微型溶孔、溶洞;②在研究区平面上的低速异常区为碳酸盐岩储层发育区带,低速异常区主要位于工区偏南部的东、西两端,其余大部分为较高的速度发育区,在构造高部位的低速异常带为有利钻探位置;③垂向上不同岩性在反演剖面上表现为不同的速度特征,即浅部的碎屑岩速度最低,中部膏盐层速度明显高于上部碎屑岩,下部碎屑岩层受压实作用影响速度高于上部碎屑岩层,主要目的层碳酸盐岩的速度最高。根据预测结果部署的两口探井均产出高产天然气流,证明地震相控非线性随机反演的预测结果准确、可靠。Focus on carbonate reservoir characteristics sensitive to P-wave attributes in Block A of Amu-darya Basin,we picked the velocity,amplitude and frequency from 3D seismic data constrained by geological and logging data,and then we applied facies-controlled nonlinear random inversion for carbonate reservoir prediction in Block A of Amu-darya Basin.The following observations were obtained.First,carbonate rocks have bedded features in Block A of Amu-darya Basin.Two strong reflections were found at the top and the bottoms of carbonate rocks.Reflections are continuous in intervals.Carbonate reservoirs are mainly porous with few caves but very few fractures.Secondly,carbonate reservoirs are mainly shown as low velocity zones,located the southeast and northeast in the study area.Low velocity zones on the structure crest are favorable drilling location.Thirdly,different lithology is shown as different velocity on inversion sections.The velocity of the upper clastic rock is the lowest,and the velocity of the anhydrite and salt rocks in the middle is higher than the upper clastic rock.And the velocity of the underlying clastic rock is higher the upper one.The velocity of the carbonate reservoir is highest.Two wells drilled on the favorable location predicted by the facies-controlled nonlinear random inversion produce large-duty gas.This demonstrated that the facies-controlled nonlinear random inversion is accurate and reliable.

关 键 词：阿姆河盆地 碳酸盐岩 储层预测 地震相控 非线性 随机反演 

分 类 号：P631[天文地球—地质矿产勘探]