曲流河储层构型中废弃河道的识别及其分布模式——以孤岛油田馆上段为例  

Discussion on abandoned channels recognition and distribution models on meandering river reservoir architecture research-case study of upper member of Guantao formation in Gudao oilfield

作　　者：张本华[1] 

机构地区：[1]中国石化胜利油田分公司孤岛采油厂,山东东营257231

出　　处：《油气地质与采收率》2013年第3期18-21,25,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家油气重大专项"煤层气开发技术经济评价"(2009ZX05042-001)

摘　　要：目前曲流河储层构型研究的关键及难点在于准确识别废弃河道及其分布。废弃河道研究的主要问题是废弃河道识别及其沉积时期划分具有不确定性。根据储层层次分析原理,结合曲流河沉积周期性变化的特征,以孤岛油田馆上段典型曲流河储层为例,依据废弃河道在单砂层沉积时期废弃的时间,将其划分为4种分布模式:主河道周边型、复合点砂坝内部型、紧贴曲流带凸岸型及孤立型。剖面上,对于1个砂层组而言,废弃河道的4种分布模式通常自下而上依次出现,代表了曲流河沉积体系的水进过程,与其正旋回的沉积特征相符。根据层次分析的精细程度,每个小层通常可细分为若干个单砂层,有时同一小层自下而上也会出现4种分布模式的废弃河道。Aiming at the two levels of fluvial reservoir research and their advantages and disadvantages, this paper points out that the key to the fluvial reservoir research is the recognition and distribution of abandoned channels. There are two main problems existing in the abandoned channels research, one is the uncertainty of abandoned channels recognition, the other is the appearance of abandoned channels that is not always indicated the boundary of a single point bar. So, taking the typical meandering river reservoir architecture research of the upper member of Guantao formation in Gudao oilfield as an example, we put forward four models about the planar distribution of abandoned channels mainly according to the abandoned period of a channel during a single sand layer′s deposition, such as the complex point bar interior type, the main channel peripheral type, cling to meandering belt′s convex bank type and the isolated type. The four types usually appear orderly from below in a sand group which represents the water-transgression in a fluvial depositional system. So, the planar distribution of abandoned channels in different sedimentary period as well as the well log analysis under the dense well pattern has important significance on enhancing the fluvial reservoir architecture research and the development effects.

关 键 词：曲流河 储层构型 废弃河道 单砂层 点砂坝 孤岛油田 

分 类 号：TE112.2[石油与天然气工程—油气勘探]