致密气藏的气层解释下限研究——以苏里格气田X区块为例

Study on the Lower Limit of Gas Reservoir Interpretation for Tight Gas Reservoirs: Taking X Block of Sulige Gas Field as an Example

气层解释下限的确定是致密气藏储层分类和储量评估的基础条件。苏里格气田X区块进入开发中后期,部分区域存在不同程度的出水现象,需要通过测井解释确定气水分布情况,而缺乏单层试气试采资料。通过分析储层岩性、物性、电性及含气性的相互关系,确定了影响储层含气性的主控因素。在此基础上,依据生产曲线典型特征确定储层流体类型,通过测井响应参数与产能之间的关系反推储层流体性质,进而提出了该区块的气层解释下限标准。

Determination of the lower limit of gas layer is the basic condition for the classification and reserve assessment of tight gas reservoirs.X block of Sulige Gas Field enters the middle and late stages of development,and there are varying degrees of water in some areas.The distribution of gas and water must be determined by logging interpretation,due to lacking of single layer gas test data.Based on the analysis of the relationship among reservoir lithology,physical property,electrical property and gas-bearing property,the main controlling factors affecting the gas bearing property of the reservoir are determined.Reservoir fluid types are determination based on typical characteristics of production curve,and reservoir fluid properties can be reversed by the relationship between logging response parameters and productivity,so the lower limit of gas reservoir interpretation is put forward.