环江油田延安组储层四性关系及出油下限研究

The Four Reservoir Relationships of Yan’an Formation in Huanjiang Oilfield and the Lower Limit of Oil Extraction

摘要: 通过对环江油田延安组主要目的层段岩心资料、物性特征及储层四性关系的分析研究表明：研究区储层具有中-低孔、低渗特征；储层含油气性主要受控于岩性和储层物性；粒度较粗的砂岩孔渗性较好，常成为油气富集的有效储集体。选取声波时差和电阻率等电性资料，根据测井、有效储层解释结论确定了区内有效储层的电性下限，并由孔隙度-声波时差、孔隙度-渗透率模型计算出研究区有效储层物性下限。通过对比有效储层下限值与岩心测试值，二者具有明显的一致性，表明储层物性-电性特征模型符合研究区地质特征，为有利区的预测提供了重要依据。

Abstract: Based on the analysis of core data, physical properties and the 4 reservoir relationships and the main target formation of Yan’an Formation in Huanjiang Oilfield, it was shown that the reservoir characteristics in the study area were middle-low porosity and low permeability. Reservoir oil and gas properties were mainly controlled by lithology and reservoir physical properties. The sandstone with coarse grain size had good porosity and permeability and was often an effective reservoir for oil and gas enrichment. Based on interval transit-time and electrical resistivity, this paper uses the logging and interpretation conclusion relationship of the effective reservoir to determine the standard of electrical lower limit of effective reservoir in the research area. According to the model of porosity-sonic transit time, porosity-permeability, the lower limit of the effective reservoir physical property in the study area is calculated. Compared with the lower limit of effective reservoir and core test values, it indicates that both are obviously consistent and indicate that the physical property-electrical characteristic model conforms with the regional geological features. The research results provide an important basis for the exploitation and favorable area prediction in the study area.