含砾砂岩储层岩性及流体性质判别

Identifying Lithology and Fluid Properties of Gravel Sand Reservoir

通过对滩海地区含砾砂岩储层成因的分析,利用杨氏模量与纵波时差交会图法识别出岩性。以模糊相似比法为基础,利用多种测井信息,提取反映含油性变化的综合评价参数,应用综合评价参数交会图法可以很好的识别出含砾砂岩储层的流体性质。综合这几种方法对目标区块10余口井进行分析处理,取得了很好的应用效果,其中储层岩性识别符合率为89%左右,含砾砂岩储层流体性质识别符合率为85%左右。

Based on analysing the geneses of gravel sand reservoir in tan-hai area, the reservoir lithology is identified with cross plot technique of yang surname modulus and longitudinal wave slowness. Assessment parameters which reflect the changes of oil bearing property are obtained based on the principle of fuzzy similarity ratio and with the use various of logging information. It is easy to identify the fluid property in the gravel sand reservoir with the cross plots of assessment parameters. The assessment parameters are analyzed from 10 wells in target zone with the method, the result is much better than ever before, i.e., the agreement rate of identifying lithology reaches about 89% and that of identifying fluid properties of gravel sand reservoir reaches about 85%.