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

蔡秋龙

Cai Qiulong

胜利油田分公司地质科学研究院，山东东营257015

Geological Scientific Research Institute,
Shengli Oilfield Company, SINOPEC, Dongying 257015,
China

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爷
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.