冲积扇储集层内部隔夹层样式——以克拉玛依油田一中区克下组为例  

Patterns of inter-layers in the alluvial fan reservoirs: A case study on Triassic Lower Karamay Formation, Yizhong Area, Karamay Oilfield, NW China

作　　者：印森林[1,2] 吴胜和[1,2] 冯文杰[1,2] 李俊飞[1,2] 尹航[1,2] 

机构地区：[1]中国石油大学(北京)地球科学学院 [2]中国石油大学(北京)油气资源与探测国家重点实验室

出　　处：《石油勘探与开发》2013年第6期757-763,共7页Petroleum Exploration and Development

基　　金：国家科技重大专项(2011ZX05030-005-02;2011ZX05009-003);国家自然科学基金(41372116)

摘　　要：以克拉玛依油田一中区克下组为例,利用岩心、露头、测井和地震资料,分析冲积扇整体展布特征,以此为基础,利用层次界面分析法研究工区不同亚相不同级次隔夹层的形态、规模及其叠置样式。工区克下组自下而上依次发育扇根、扇中和扇缘沉积,粒径向上变细,为一完整退积型沉积序列。冲积扇储集层隔夹层可分为岩性隔夹层(细粒沉积)和物性夹层(泥质砂(砾)岩)两类,冲积扇不同亚相带的隔夹层成因、样式及规模差异较大。扇根亚相带隔夹层呈"整体分散,局部交织状",表现为高渗透网络中的部分不连续遮挡;扇中亚相带隔夹层整体以相对稳定隔层和侧向分隔夹层为主,渗流屏障遮挡能力迅速增强;扇缘隔夹层整体呈"千层饼"状,储集体在顺源方向呈镶嵌状,垂直物源方向呈透镜状被厚层隔夹层分隔,其渗流屏障的遮挡能力在冲积扇各亚相带中最强。This paper discusses the overall distribution characteristics of alluvial fan in the Triassic Lower Karamay Formation, Yizhong Area, the Karamay Oilfield, with core, outcrop, logging and seismic data. On this basis, the shapes, sizes and stacking pattems of inter-layers in different levels and sub-facies are analyzed using the hierarchy interface method. In the study area, the Lower Karamay Formation contains （from bottom to top） upper fan, mid fan and lower fan deposits, with size-reducing grains, as a complete retrograding sedimentary sequence. The inter-layers in the alluvial fan reservoir can be divided into two types： lithological interlayer （fine sediments） and physical interlayer （argillaceous sandstone/conglomerate）. Origin, pattern and size of inter-layers vary significantly in different subfacies zones. In particular, the inter-layers in upper fan are ＂scattered generally and interlaced locally＂, presenting as partially discontinuous screen in a high-permeable network; the inter-layers in mid fan are relatively stable inter-layers and lateral inter-layers, with a higher capacity to shade or screen the seepage; the inter-layers in lower fan present as a layered cake, with reservoir bodies mosaic-like along the source and lenticular in perpendicularity to the source that are separated by thick interlayer, showing the highest capacity of screen.

关 键 词：克拉玛依油田 克下组 冲积扇 隔夹层 扇根 扇中 扇缘 

分 类 号：TE122.1[石油与天然气工程—油气勘探]