砾岩储层注水开发后期高渗流通道成因特征及其识别  

Genesis Feature and Identification of High Permeability Pathways in Conglomerate Reservoir in High Water Cut Stage

作　　者：徐春华[1,2] 侯加根[1] 唐衔[1] 杨玉珍[3] 王明峰[4] 李臣[4] 高健[1] 刘钰铭[1] 

机构地区：[1]中国石油大学(北京)资源与信息学院,北京102249 [2]华东有色地勘局海洋研究院,南京210007 [3]中石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [4]中石油新疆油田公司采气一厂,新疆克拉玛依834000

出　　处：《科技导报》2009年第23期19-27,共9页Science & Technology Review

摘　　要：准噶尔盆地西北缘二叠-三叠系储层是洪积扇相砂砾岩体,油藏由于长期注水开发,后期形成了许多高渗流通道。从静态成因、工程动态成因角度总结了高渗流通道的形成原因,认为砾岩储层中高渗通道的主要成因有:沉积微相控制、微裂缝网络连通、沉积成岩作用程度弱(欠压实砂砾体弱胶结)、特殊的支撑砾岩岩石沉积结构、储层改造、长期注水微颗粒迁移、不同岩性沉积界面高渗通道、不整合面等8种。通过确定高渗透段的成因及其识别特征,将其嵌到单期水道内,建立高渗透层段的空间分布规律。高渗通道的开发动态特征为:高渗通道对应段吸水量高、高渗通道对应段吸水量随注水时间的延长而一般吸水量明显增大、高渗通道对应段地层压力从不明显到逐渐增高。由于储层高渗流通道的存在,导致注入水无法起到有效驱油作用,注入水无效循环严重影响了油藏注水开发效果。总结高渗流通道的特征并有效识别,是改善砾岩油藏储层开发效果的地质基础。The reservoir of Triassic-Permian strata in the northwest zone of Zhungar basin is a pluvial fan and sand-conglomerate reservoir, and the genesis causes of its high-permeability pathways are discussed in this paper. From the genesis and identifications of pluvial fan glutenite high-permeability pathways, 8 types of highpermeability pathways are found in the glutenite reservoir. In the middle and later stages of development, there are static and dynamic factors for injection-production controlling high-permeability pathways, which are sedimentary micro facies, micro fracture network, diagenesis uncompaction, support glutenite structure, and which induce hydraulic fracture, grain motion, depositional interface, unconformable interface etc., developing characteristics of highpermeability pathways with water intake capacity more than adjacent beds, and injection-production formation pressure enhanced apparently. Because of high-permeability pathway generation, injection-water can not drive oil effectively, which is the reason of bad productivity. This paper provides a geological basis to understand the characteristics of high-permeability pathways and to identify them.

关 键 词：砾岩油藏储层 油藏注水开发 高渗通道 

分 类 号：P618.13[天文地球—矿床学]