沼泽沉积环境的辫状河道特征及其识别方法
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摘要
鄂尔多斯盆地二叠系石盒子组盒8砂岩岩性气藏属沼泽背景下的辫状河沉积。砂岩以粗砂岩、中粗砂岩和中砂岩为主。层理类型主要为块状层理、板状交错层理。沉积序列总体上呈下粗上细的正旋回。心滩沉积微相是最主要的有效储层沉积单元,其内部结构较均匀,伽马曲线表现为较平滑的低值箱状曲线特征。河道地震反射外形呈透镜状或顶平下凸的丘状,属差连续性、中振幅、上超充填地震相。在开发前期井少且井距大的情况下,综合应用地震、地质、测井、钻井等资料,利用地震波形聚类分析和古构造恢复方法进行河道识别,得到盒8期辫状河道平面分布特征。据此优选建产区块和部署开发井位,取得了较好效果。
The lithological gas reservoir of P2h2 sandstone in Ordos basin belongs to braided deposition palustrine background. The sandstones are mainly coarse, medium-coarse and medium sandstones. Clumpy bedding and tabular cross-bedding are the main types. The sedimentary sequence generally presents a positive cycle characterized by upper--groase and lower--fine. Channel bar sedimentary micro-facies is most important effective sedimentary unit of the reservoir, the inner structure is more uniform and Gamma ray curves are characterized by more smooth and box with low amplitude. The configuration of channel seismic reflections shows lenticular or mounded form and belongs to bad continuity, medium amplitude and on-lap filling seismic facies. In the earlier days of development characterized by fewer drilled wells and larger well spacing ,integrative application of seismic , geologic , logging and drilling data and using cluster analysis of seismic waveform and restoration of paleostructure to identify channel, which obtained planar distributed feature of P2h2 braided channel. The optimized construction blocks and arranged development wells on these grounds achieved good results.
The lithological gas reservoir of P2h2 sandstone in Ordos basin belongs to braided deposition palustrine background. The sandstones are mainly coarse, medium-coarse and medium sandstones. Clumpy bedding and tabular cross-bedding are the main types. The sedimentary sequence generally presents a positive cycle characterized by upper--groase and lower--fine. Channel bar sedimentary micro-facies is most important effective sedimentary unit of the reservoir, the inner structure is more uniform and Gamma ray curves are characterized by more smooth and box with low amplitude. The configuration of channel seismic reflections shows lenticular or mounded form and belongs to bad continuity, medium amplitude and on-lap filling seismic facies. In the earlier days of development characterized by fewer drilled wells and larger well spacing ,integrative application of seismic , geologic , logging and drilling data and using cluster analysis of seismic waveform and restoration of paleostructure to identify channel, which obtained planar distributed feature of P2h2 braided channel. The optimized construction blocks and arranged development wells on these grounds achieved good results.
引文
[1]赵澄林．沉积学原理．北京:石油工业出版社,2001
[2] 冯增昭．沉积岩石学(下册)．北京:石油工业出版社, 1993
[3] 吴崇筠等．中国含油气盆地沉积学．北京:石油工业出 版社,1992
[4] 薛叔浩等．湖盆沉积地质与油气勘探．北京:石油工业 出版社,2002
[5]C E佩顿．地震地层学．北京:石油工业出版社,1980
[6] 陆基孟．地震勘探原理(下册)．山东东营:石油大学出 版社,1993
[7]于建国等．分流河道特征及其识别方法:以东营凹陷东 部地区为例．高校地质学报,2002,8(2):154～156
[8]R E谢里夫,L P吉尔达特．勘探地震学(下册)．北京: 石油工业出版社,1999
[2] 冯增昭．沉积岩石学(下册)．北京:石油工业出版社, 1993
[3] 吴崇筠等．中国含油气盆地沉积学．北京:石油工业出 版社,1992
[4] 薛叔浩等．湖盆沉积地质与油气勘探．北京:石油工业 出版社,2002
[5]C E佩顿．地震地层学．北京:石油工业出版社,1980
[6] 陆基孟．地震勘探原理(下册)．山东东营:石油大学出 版社,1993
[7]于建国等．分流河道特征及其识别方法:以东营凹陷东 部地区为例．高校地质学报,2002,8(2):154～156
[8]R E谢里夫,L P吉尔达特．勘探地震学(下册)．北京: 石油工业出版社,1999
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