牛20低渗断块裂缝的分布及对开发效果的影响  

Fracture distribution and effect in Niu 20 low permeability faulted block on exploitation efficiency

作　　者：时佃海[1] 陈光梅[1] 邢正岩[1] 陶国秀[1] 刘峰[1] 

机构地区：[1]胜利油田有限公司地质科学研究院,山东东营257015

出　　处：《大庆石油学院学报》2004年第3期10-13,共4页Journal of Daqing Petroleum Institute

摘　　要：研究了牛 2 0断块裂缝的分布规律 ;分析了在不同开发阶段裂缝对日产油量、含水率、采油 (液 )指数等开发效果的影响 .结果表明 :牛 2 0断块天然裂缝具多方向性 ,主要以北西西向、北东东向及北东向为主 ,人工压裂裂缝则主要是追踪天然裂缝形成 ;该区的含水率与采出程度关系曲线呈“S”形 ,水驱特征曲线呈“三段式”的特征 ,实际的要比理论的无因次采油、采液指数减小 2 1%和 19%等 ,充分表征了牛 2 0断块储层为裂缝 -孔隙型油层 .故针对此类型储层 ,应选择分层压裂 ,并选择物性差、含油饱和度高的层限流压裂 .In this paper, the rule of fracture distribution in Niu 20 faulted block is studied, and the effect of fracture on exploitation result such as daily oil capacity percentage of water, productivity oil(fluid) index are analyzed. As a result, the fractures in Niu 20 faulted block are mostly in the direction of NWW, NEE and NE. Man-made fractures are mainly formed by tracking out natural fractures, the connection curve of containing water or moisture and recovery percent represent ”S” shape, the characteristic curve of water drives presents ”three segment”; the productivity factor decreases by 21% and 19% compared with that of theory factor, which proves that it is a fracture-pored reservior. For such fracture-pored type of reservior, separate layer fracturing should be adopted, limiting fluid fracturing of pool reservior properties and high oil saturation should be employed.

关 键 词：牛20断块 低渗透油藏 裂缝分布规律 采油(液)指数 开发效果 

分 类 号：TE111.2[石油与天然气工程—油气勘探]