DJ油田Q段复杂储层流体识别

DJ油田Q段储层地质特征复杂,储层电阻率测井响应受多种因素影响,低阻油层与高阻水层同时存在,应用常规方法在DJ油田Q段无法建立统一的油水识别标准,流体识别有较大困难。为解决这一难题,综合应用岩心、测井、测试、化验分析等资料,开展低阻油层与高阻水层成因及流体识别方法研究。明确了DJ地区Q段低电阻率对比度,主要是由地层水矿化度差异大、泥质体积分数与碳酸盐体积分数分布不均衡造成的;基于成因认识,采用单因素校正与分区评价相结合的流体识别方法,建立了含钙泥质砂岩等效体积导电模型,在矿化度相对稳定的区域内应用等效纯砂岩地层电阻率模型,准确判别了DJ油田Q段的储层流体性质。

Identification of complicated reservoir fluid in Member Q of DJ Oilfield

Geological features are relatively complex in Member Q of DJ Oiltield, and log response of reservoir resistivity is affected by many factors, resulting in low-resistivity oil layer and high-resistivity water layer to exist simultaneously. The application of convemional methods can not establish an oil-water identification standard in the DJ Oilfield and fuid identification is difficuh. To solve this problem, based on the data of integrated application of core, logging, testing, laboratory analysis, the genesis and fluid identificatiuu of low-resistivity oil layer and high-resistivity water layer are analyzed. The results show that low-resistivity contrast ratio is mainly caused by great formation water salinity differences, uneven distribution of mud content and carbonate euntent. Based on the genesis umlerstanding, an equivalent volume conductivity model of calcium-bearing argillaceous sandstone is established through the application of the fluid identifieation method combined single-factor correction with regional evaluation. Application of resistivity model of equivalent clean sandstone formation in a relatively stable area of mineralization degree can discriminate tire reservoir fluid characteristies of Member Q of DJ Oilfield.