东营凹陷低电阻率油层地质主控因素分析

Primary geologic origins analysis on low resistivity zone in Dongying Depression

针对高矿化度地层水型低电阻率油层,运用岩电实验分析资料和典型区块地质特征解剖相结合的方法,定量评价地层水对储层视电阻率的影响及地质主控因素分析。研究表明,地层水矿化度高达50g.L-1时可形成该类低电阻率油层,沉积水环境和构造断裂是该类低电阻率油层的地质主控因素,沙四段、沙三中下储层和大的构造断裂附近为东营凹陷有利的低电阻率油层发育区带。

In view of the low resistivity zones of high formation water salinity,the influences of formation water on reservoir apparent resisitivity were quantitatively evaluated and the primary geology origins were analyzed through petrophysical experimental analysis and anatomy of representative blocks' geologic features.The results show that the low resistivity zones of high formation water salinity can be come into being when the formation water salinity is greater than 50gramme per litre,that the sedimentary water environment and structure fracture are primary geology origins of low resistivity zones of high formation water salinity,which mostly distribute in the reservoir of the fourth section of Shahejie Formation,base of the middle part of the third section in Shahejie Formation and the vicinity of large structure fractures in Dongying Depression.