港中浅层低电阻率油层成因及识别方法

Genesis analysis and identification method of low resistivity pay zones in Gangzhong shallow layer

针对港中浅层存在的低电阻率油层现象开展研究,分析了构造、岩性、地层水性质及钻井液性能等影响地层电阻率的主要因素,探讨了评价低电阻率油层的技术对策。通过综合利用测井、测试及地质资料开展精细地层对比,分析各套油水系统的分布规律,有针对性地进行油水层综合评价,突破传统油层评价观念束缚,充分挖掘各类油气信息,重新制定了该区的油气层解释图板,现场实施取得了比较好的效果,为该区类似油气层的重新评价提供了借鉴。

The study was made on the phenomenon of low resistivity pay zones which existed in Gangzhong shallow layer,the analysis was made of the structure,lithology,formation water properties,drilling fluid properties and the other key factors which influent formation resistivity and the technical countermeasures of evaluating low resistivity pay zones were discussed. Through comprehensively utilizing wireline logging data,well test data and geologic data,the fine stratigraphic correlation were carried out,the regularities of distribution for various oil-water systems were analyzed,and the comprehensive evaluation was made aiming at the oil-water beds. By smashing the trammels of traditional concepts of oil reservoir evaluation and making thorough investigation to every type of oil-gas information,the hydrocarbon reservoir interpretation charts for this area were reformulated. The field application has made good results,and the method provides reference for re-evaluating the similar hydrocarbon reservoirs in Gangzhong shallow layer.