摘要
鄂尔多斯盆地姬塬油田长6储层油水关系复杂,其形成的油层与水层电阻率差异很小,测井对比度低,导致油水层识别困难,属于多因素复杂储层,需要从多角度深入开展相应的成因机理和流体识别方法研究。通过配套的岩石物理实验,水性、试油等资料分析,结合低对比度油层的测井响应特征,确定高束缚水饱和度作用和地层水矿化度差异是其形成低对比度油层的主控因素。基于油层主控因素分析,优选综合反映储层岩性、物性、电性、水性的敏感曲线,建立基于高束缚水和矿化度差异的流体敏感因子低对比度油层识别图版和流体特征判别指数方法,对该地区新完钻20口井试油层进行判别,符合率达到了85%,有效提高了低对比度油层的测井解释符合率。
The OWC of Chang 6 reservoirs in Jiyuan oilfield,the Ordos basin,is complex.The resistivity difference between the oil layer and the water layer is very small,and the logging contrast is low,so that it is difficult to distinguish the oil layer from the water layer.For these complex reservoirs controlled by multiple factors,genesis mechanism and fluid identification should be carried out from various aspects.This study first determines the main factors controlling the formation of low-contrast reservoirs by analyzing high irreducible water saturation and the difference of formation water salinity based on petrophysical experiments,water and oil test data,and logging response characteristics of the low-contrast reservoirs;then after selecting sensitive curves reflecting lithology,physical properties,electrical properties and water quality,establish fluid sensitive factor identification charts and fluid characteristic identification index based on high irreducible water and formation water salinity.Using the method in 20 new wells in the Jiyuan area,the coincidence rate of logging interpretation on oil layers tested is 85%.It can effectively improve the coincidence rate of logging interpretation on low contrast reservoirs and provides technical support for exploration and development of such reservoirs.
作者
张海涛
郭笑锴
杨小明
周丽艳
胡琮
李婷婷
ZHANG Haitao;GUO Xiaokai;YANG Xiaoming;ZHOU Liyan;HU Cong;LI Tingting(Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710018,China;Logging Application Institute,China Petroleum Logging CO.LTD.,Xi’an,Shaanxi 710077,China)
出处
《测井技术》
CAS
2019年第5期542-549,共8页
Well Logging Technology
基金
中国石油天然气集团股份有限公司重大科技专项《复杂油气藏地震预测与测井识别技术研究》(2016E-0503)
中国石油集团测井有限公司项目《低饱和度、低对比度地层油水识别技术研究》(CPL2018-B04)
关键词
测井解释
低对比度
成因机理
流体敏感因子
流体特征判别指数
识别方法
姬塬地区
log interpretation
low contrast
genesis mechanism
sensitive fluid factor
fluid characteristic discrimination index
identification method
Jiyuan area
