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致密砂岩气藏作为非常规油气资源的主力,已经越来越受到重视。由于致密砂岩气藏不同于常规气藏,具有储层致密、物性差、电性响应不明显的特点,因此有必要针对致密砂岩气藏的有效厚度下限进行研究。以鄂尔多斯盆地某气田上古生界致密砂岩气层为例,在“四性”关系研究的基础上,较为系统地阐述了致密砂岩气藏有效厚度下限确定的方法,重点探讨了测试法、经验统计法、压汞参数法和测井曲线法。实际试气数据和横向对比验证表明,这些方法确定的有效厚度下限合理,符合研究区实际地质特点,操作简单,应用效果好。
As a main force of unconventional oil and gas resources, tight sandstone gas reservoirs have received more and more attention. Because tight sandstone gas reservoirs are different from conventional gas reservoirs and have the characteristics of tight reservoirs, poor physical properties and no obvious electrical response, it is necessary to study the lower limit of effective thickness of tight gas reservoirs. Taking the tight sandstone gas reservoirs in the Upper Paleozoic of a gas field in the Ordos Basin as an example, this paper systematically expounds the method of determining the lower limit of the effective thickness of tight sandstone gas reservoirs based on the study of the " Empirical statistical method, mercury intrusion parameter method and well logging curve method. The actual test data and horizontal contrast tests show that the lower limit of the effective thickness determined by these methods is reasonable and accords with the actual geologic characteristics of the study area, and the operation is simple and the application effect is good.