川西E区须家河组致密碎屑岩储层流体识别方法及优选——以E101井为例

IDENTIFICATION OF THE FLUID IN TIGHT CLASTIC RESERVOIR OF XUJIAHE FORMATION IN WESTERN SICHUAN GASFIELD AND OPTIMIZATION

川西E区须家河组储层为典型的致密碎屑岩储层,具有低孔低渗、高含水饱和度、裂缝发育的特点。流体分布、油、气、水关系复杂,油气藏模式难以确定,造成流体性质识别存在较大困难。本文以E101井为例,利用P1/2正态分布法、含水饱和度与孔隙度交会法、纵横波速度比与纵波时差交会法、RT-POR法共四种测井方法对该区流体性质进行判别。通过实例分析验证了各种方法对于流体性质识别的有效性,为该区域的流体性质判别打下了基础。

Xujiahe reservoirs in E area of western Sichuan are the typical tight clastic reservoirs with low porosity and permeability, high water saturation, fracture development features.It is hard to determine the reservoir model because of the complex relationship between oil, gas and water and fluid distribution, which makes fluid identification difficult.In this paper, Well E101 is taken as an example. Four logging methods are used to distinguish the fluid in the area: P1/2 normal distribution, water saturation and porosity cross, S-wave and P-wave velocity ratio and compressional slowness cross, RT-POR method.Case analysis has proved that each method is available and laid a foundation for fluid identification in this area.