鄂尔多斯盆地陇东地区延长组低渗透储层孔隙结构分类研究  

Research on the pore structure classification of low permeability reservior of the Yanchang Formation in Longdong Area,Ordos Basin

作　　者：冉新权[1] 吴胜和[2] 付晶[2] 魏新善[1] 楚美娟[1] 

机构地区：[1]中国石油长庆油田分公司,陕西西安710018 [2]中国石油大学(北京)地球科学学院,北京102249

出　　处：《地学前缘》2013年第2期77-85,共9页Earth Science Frontiers

基　　金：国家科技重大专项课题"鄂尔多斯盆地大型岩性地层油气藏勘探开发示范工程"(2008ZX05044 1-3-2)

摘　　要：运用铸体薄片、扫描电镜与常规压汞等资料,对陇东地区延长组低渗透储层孔隙结构分类标准进行了研究。不同孔隙结构特征参数与宏观物性参数的相关分析表明,最大连通喉道半径与渗透率的相关关系最好,为喉道分级的最优参数;运用数据构形的方法确定出了喉道分级界限,建立了储层孔隙、喉道分级标准。综合孔隙与喉道大小的组合及储层孔喉的其他特征,将延长组储层砂岩的孔隙结构划分为六种类型:大—中孔粗喉型、中—小孔中喉型、中—小孔细喉型、小孔微细喉型、细—微孔微细喉型和细—微孔微喉型。不同孔隙结构类型的储层具有不同的物性特征及不同的产液能力。Using the data such as cast thin section, scanning electron microscope and mercury-injection, the present paper investigates the pore structure classification standards of low permeability reservoir of the Yanchang Formation in I.ongdong Area, Ordos Basin. The correlation analysis among characteristic parameters of microscopic pore structure and macroscopic physical properties shows that the maximum connected pore-throat radius has the best correlativity with permeability and acts as the favorable parameter for throat grading; using method of data configuration, the paper determines the throat grading boundaries and establishes the grading standards of reservoir pores and throats. The reservoir pore structure of the Yanchang Formation could be classified into six types including big-mid pore coarse throat type, mid small pore mid throat type, mid-small pore fine throat type, small pore micro-fine throat type, fine-micro pore micro fine throat type, and fine-micro pore micro throat type. Reservoir could have different physical properties and liquid production capacity according to its pore structure type.

关 键 词：低渗透砂岩储层 微观孔隙结构 分类评价 陇东地区延长组 

分 类 号：TE22[石油与天然气工程—油气井工程]