关键词: 有效厚度, 物性下限标准, 电性下限标准, 致密砂岩气藏

Abstract:

There is more and more attention being paid to the tight sandstone gas pools which have been the major force of the unconventional petroleum resources.As the tight sandstone gas pools are different from the conventional ones,whose reservoirs are tight,the rock property is bad,and the electrical response is unclear,thus it is necessary to clarify the lower limit of effective thickness for the tight sandstone gas pools.Based on the study of “the four property relationship”,this article takes the Upper Paleozoic tight sandstone gas reservoir of some gas field in Ordos basin as example,and systematically describes the method of determining effective thickness lower limit of tight sandstone gas pools,and the test method,the experience statistics method,the mercury injection parameter method and the logging curves method are respectively discussed.Compared with the actual gas testing data,the effective thickness lower limit determined by these methods is reasonable and meets up with the actual geological characters,of which the operation is simple and applies well.

Key words: Effective thickness, The property lower limit, The electrical lower limit, The tight sandstone gas pools