试油层产液性质的多参数综合判别方法研究

准确地判断储层的产液性质,是试油选层和试油方案优化的重要依据,目前常用的判别方法是基于电测解释结论的多因素经验判别,有较大的人为性和随意性,致使正判率和符合率相对较低,一方面增加了无效的试油工作量,另一方面,增加了漏试油气层的风险.为解决这一问题系统收集和统计了塔里木油田碎屑岩地层反映产液性的录井、测井资料和试油成果资料,通过综合分析对比,提出了预测储层产液性质的新方法--综合权值法.该方法通过一定的规则给电测解释结论、岩心含水迹象、滴水试验、含油饱和度、孔隙度、原油粘度等与产液性相关的因素赋以权值,从而求得综合权值,进而对储层产液性质进行综合判别.综合权值法明显优于单纯的电测解释,使油气水层解释的平均符合率和平均正判率都提高了20%.利用该方法判断储层产液性质具有操作简单、判别率高等优点,对于更合理地优选试油层位和优化试油方案具有重要的实际应用价值.

Research of comprehensive multiparameter weighted value discrimination method on liquidity of well testing formation

To exactly discriminate the liquidity of formations is an important basis for selection of formations to be tested and the optimization of well testing scheme.Multi-factor experimental discrimination method on the basis of electric log interpretation is used extensively in the oilfield.The artificiality and arbitrary results cause lower coincidence and accuracy.So,the common methods not only enlarge invalid well testing workload,but also increase the risk of missing hydrocarbon zones.In this article,related data of well survey,well logging and well testing that reflect the liquidity of clastic formation in Tarim Oilfield are systematically collected.Through comprehensive analysis and comparison,a new comprehensive discrimination method is recommended to predict the liquidity of formation.In term of certain laws,several factors related to liquidity,such as electric log interpretation result,water bearing indication of drilling core,test of dripping water,oil saturation,porosity and viscosity of crude oil are calculated to conclude a comprehensive weighted value.This method is obviously superior to the single electric log interpretation with average coincidence rate and average rate of correct discrimination by increasing 20%.This method,with simple operation and accurate discriminating result for liquidity of formations,is really important and useful for more rational selection of formations to be tested and the optimization of well testing scheme.