CAJ | 학술논문

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.
준갈이분지서북연이첩-삼첩계저층시홍적선상사력암체,유장유우장기주수개발,후기형성료허다고삼류통도.종정태성인、공정동태성인각도총결료고삼류통도적형성원인,인위력암저층중고삼통도적주요성인유:침적미상공제、미렬봉망락련통、침적성암작용정도약(흠압실사력체약효결)、특수적지탱력암암석침적결구、저층개조、장기주수미과립천이、불동암성침적계면고삼통도、불정합면등8충.통과학정고삼투단적성인급기식별특정,장기감도단기수도내,건립고삼투층단적공간분포규률.고삼통도적개발동태특정위:고삼통도대응단흡수량고、고삼통도대응단흡수량수주수시간적연장이일반흡수량명현증대、고삼통도대응단지층압력종불명현도축점증고.유우저층고삼류통도적존재,도치주입수무법기도유효구유작용,주입수무효순배엄중영향료유장주수개발효과.총결고삼류통도적특정병유효식별,시개선력암유장저층개발효과적지질기출.
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 high-permeability 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 high -permeability 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.