陆相断陷盆地地层水化学场变化规律分析

Analysis on the Changes of Formation Water Chemical Field in Land Facies Fault Basin

油气层解释要解决的首要问题是地层水的化学特征问题。陆相断陷盆地地层水的化学场是比较复杂的,纵向上,地层水的化学特征一般不尽相同;横向上,同一套储层中不同井之间其地层水的化学特征,有可能相同也可能不同,甚至相差很大。地层水的化学特征即受控于沉积环境又受控于沉积后的成岩作用、构造运动,有的与火山活动密切相关,有的与地层水与其宿主岩的形成时间有关。陆相油藏测井解释含油饱和度工作中,在地层水电阻率的选取时,以上因素都应该充分考虑。

The first problem in hydrocarbon zone interpretation is the chemical characters analyses of formation water. The chemical field of formation water is very complex in fault basin of land facies. In vertically, the chemical character of formation water is generally not the same; in horizontally, the chemical character of formation water in different wells in the same reservoir is perhaps the same or different, even very different. The chemical character of formation water is not only controlled by the depositional environment, but also by post-depositional lithogeny and tectonic movement. And some characters are related to the volcanic event, some to the formed time of host rock. When interpreting the oil saturation of land facies reservoir and selecting the formation water resistivity, we should fully consider the influencine factors above.