洪积扇相砂砾岩体储层构型研究方法探讨  

Reservoir Architecture of Multiplex Glutenite on Alluvial Fan

作　　者：焦巧平[1] 高建[1] 侯加根[2] 岳大力[2] 

机构地区：[1]中国石油化工股份有限公司胜利油田分公司地质科学研究院,山东东营257015 [2]中国石油大学资源与信息学院,北京102249

出　　处：《地质科技情报》2009年第6期57-63,共7页Geological Science and Technology Information

基　　金：国家高技术研究发展计划(863计划)项目(2008AA06Z206);中国石油天然气股份有限公司重点科技攻关项目"准噶尔盆地西北缘滚动精细勘探(2005~2009)"

摘　　要：在厘定其不同层次界面成因的基础上,把Miall研究思路成功移植到洪积扇相复杂储层中,建立了与开发精度相匹配的洪积扇储层内部结构研究的层次分析法,即复合水道、单期水道和高渗透段3个层次。划分出洪积扇砂砾岩储层5级构型界面:5级界面为洪泛沉积发育稳定的泥岩,构成油田开发中的隔层;4级界面由厚度变化的泥岩、粉砂质泥岩组成,形成流体渗流屏障;3级界面为形成的支撑砾岩体与周围储集体的岩性突变面。总结了复合水道规模扇缘亚相单期条带状、扇中亚相多期交织的宽带状及扇顶亚相多期垂向叠加的厚层板状砂砾岩体的分布特点。提出了洪积扇单期水道研究方法,即分别从单期水道4个方面的垂向识别特征和4种单期水道的侧向界面识别标志入手,在3种单期水道空间组合模式指导下开展三维空间组合研究。2个典型井区的实例分析表明,扇顶亚相单期水道的边界沿着古水流方向近似呈直线分布,多期水道呈楔形叠瓦状前积叠加,垂直物源方向为垂向加积切割叠置关系;扇中亚相单期水道边界类似曲率较小的辫状河道边界,多期水道具有侧向叠置的特点。Based on the study of different hierarchical bounding surfaces and the transplantation of the Miall＇s idea in the complex reservoir of alluvial fans, a hierarchy analysis method is established, which is suited for the development precision on the inner structure of the alluvial fans. This hierarchy consists of the large-scale glutenite multiplex channel, moderate scale single channel and the small scale high penetrative member. Then five level architectural boundary systems of glutenite of alluvial fan reservoir are set up. The bounding surfaces at Level Five and Level Four often act as fluid-flow barriers, while that at Level Three is a contact plane between two kinds of lithology. The distribution of the three planar model of multiplex glutenite is characterized by single-period banding of the subfacies on the fan margin, multi-peri- od mingle broad banding of the intrafan subfacies and multi-period thick vertical superimposition tablet in the fanhead subfacies. Hence, a method of single-period channel is proposed for the study based on these characteristics. With this method the three dimensional assemblage is established with spatial pattern of the three kinds of single-period channel according to the four fields of vertical and latteral identification marks of each single period-channel. The analysis of two actual typical well blocks demonstrates that the single-period channel of the fanhead subfacies is distributed along the ancient water flow , approximlately linear to the orientation of the sedimentary source, and that the multi-period channel is wedge-shaped imbricate superimposition, cutting and overlying on the vertical orientation of sedimentary source. While the intrafan suhfacies present characteristics of muli-period channel sideway overlying on the vertical orientation of sedimentary source.

关 键 词：洪积扇 砂砾岩复合体 储层构型 克拉玛依油田 

分 类 号：TE122.221[石油与天然气工程—油气勘探]