【摘要】 X油田长9段低对比度油层发育,测井响应规律复杂,给储层流体性质识别带来了极大困难。结合数值模拟和物理实验,明确地层水矿化度差异大是低对比度油层产生的主要原因,并基于成岩作用和构造作用,弄清地层水矿化度差异大的地质成因。改进电阻率—孔隙度交会图法预测地层水矿化度,利用地层水矿化度预测胶结指数和饱和度指数。采用动态地层水矿化度和胶结指数的方法,较好地识别油层、油水同层和含油水层、水层,有效地提高测井解释符合率,为研究区低对比度油层的识别提供可行的解决办法。更多还原

【Abstract】 Low contrast pay zone develops in Chang 9 member of the study area and the logging responses’ laws are complex, which makes reservoir fluid property identification difficult. Combining numerical simulation and petrophysical experiments, it is found that the low contrast pay zones are mainly caused by the great variation of formation water salinity. According to diagenesis and tectonism, the geological origin of formation water salinity variation is clear. The resistivity and porosity cross plot method is improved to predict formation water salinity, which is used for cementation index and saturation index prediction. Pay zones, oil-water layers and water layers with oil, water layers are identified with varied formation water salinity and cementation index, which provides a feasible solution for low contrast pay zone indentification and improves log interpretation coincidence rate in the study area.更多还原