低电阻率油气层宏观地质影响因素与微观机理的匹配关系

低电阻率油气层的电阻率低于或接近邻近水层的电阻率,使得在电性上难以区分油气层与水层,给测井评价带来很大难度.低电阻率油气层的成因非常复杂,成因类型多,而且不同油气田的低电阻率油气层成因存在差异,因此,系统了解低电阻率油气层的成因,对利用测井等资料评价低阻油气层是很有意义的.目前对其微观机理研究已经比较成熟,但是对宏观地质规律缺乏研究.根据胜利油区已发现的具有典型意义低电阻油气层,从地质角度分析了低阻油气层存在的原因,并首次重点分析研究了低阻多种微观导电机理与宏观地质因素之间的匹配关系.该研究对认清低电阻油藏形成的地质背景、分布规律甚为重要,并且对今后该类油藏的勘探具有十分积极的意义.

Interaction Between Geologic Genesis and Micro-geological Causes in Low-resistivity Pay Zones, Shengli Oilfield

It's very difficult to distinguish hydrocarbon reservoirs from water reservoirs electrically because of the similar resistivities between them.At present study about the geologic origin of the low-resistivity reservoirs is in great need.Based on the typical low-resistivity reservoirs in Shengli oilfield,this paper analyses the geologic origin firstly and then emphasizes on the interaction between the micro-geological causes and geologic genesis,which is very important to help us to find out the geologic background and regularities of distribution of low resistivity pay zones and very meaningful for the future exploration of this kind of reservoirs.