低孔低渗气藏测井识别方法的应用研究

低孔低渗油气藏一直是储层测井评价中的一个难点问题。锦旗工区根据岩性、物性以及含油气性的关系,采用侵入特性、孔隙度曲线重叠、含气指示、声波速度比值等方法进行低孔低渗气藏的识别。锦旗地区面积大,气水关系复杂,应充分利用各种测井资料,采用多种方法开展流体性质分析,进行综合判别。从应用效果来看,孔隙度重叠,含气指示方法最为可靠。

Application Study of Identification Method for Low Porosity and Permeability Gas Reservoir Logging

Oil and gas reservoir with low porosity and permeability has been a difficult problem in reservoir logging assessment. In Jinqi work area, according to relations among lithology, physical property and oil--gas possibility, some methods are applied to identify gas reservoir with low porosity and permeability. They include invasion features, porosity curve overlapping, oil--bearing indication, acoustic velocity ratio and other methods. In the light of complex oil--gas relation in Jinqi worksite which is large, it is necessary to make full use of various logging information and multiple methods to analyze and distinguish fluid properties in an all--round way. Application effect shows that oil--bearing indication method is the most reliable in the area where porosity is overlapping.