综合利用试井解释、生产动态分析以及覆压孔渗、气水相渗和高压压汞等检测技术,定量评价了孔隙型砂岩储集层地层条件下有效渗透率与常规基质渗透率、含水饱和度的关系,确定了不同渗透率孔隙型砂岩储集层的主流通道指数范围;建立了孔隙型砂岩储集层地层条件下有效渗透率评价方法、孔隙型砂岩储集层储量动用程度与主流通道指数关系图版。研究表明:孔隙型砂岩储集层主流通道指数与常规基质渗透率、含水饱和度密切相关,常规基质渗透率越低、含水饱和度越高,主流通道指数越低。常规基质渗透率大于5.0×10-3 μm2时,主流通道指数一般大于0.5;常规基质渗透率为1.0×10-3~5.0×10-3 μm2时,主流通道指数为0.2~0.5;常规基质渗透率小于1.0×10-3 μm2时,主流通道指数通常小于0.2。孔隙型砂岩储集层地层条件下有效渗透率评价方法可以对新发现气藏或未开展试井测试的气藏实现快速评价并判识致密砂岩气;孔隙型砂岩气藏储量动用程度与主流通道指数关系图版可为可动用储量评价及井网加密提供依据,为气藏开发评价以及合理开发技术政策制定提供技术支持。图10表1参25
Based on well test interpretation, production performance analysis, overburden permeability and porosity test, gas-water core flooding test and high-pressure mercury injection, a quantitative correlation has been built of in-situ effective permeability with routine permeability and water saturation, and the ranges of Main Flow Channel Index (MFCI) are determined for different permeability levels in porous sand gas reservoirs. A new method to evaluate the in-situ effective permeability of porous sand reservoir and a correlation chart of reserves producing degree and main flow channel index are established. The results reveal that the main flow channel index of porous sand gas reservoirs has close correlation with routine matrix permeability and water saturation. The lower the routine matrix permeability and the higher the water saturation, the lower the MFCI is. If the routine matrix permeability is greater than 5.0×10-3, the MFCI is generally greater than 0.5. When the routine matrix permeability is from 1.0×10-3 to 5.0×10-3, the MFCI is mainly between 0.2 and 0.5. When the routine matrix permeability is less than 1.0×10-3, the MFCI is less than 0.2. The evaluation method of in-situ effective permeability can be used to evaluate newly discovered or not tested porous sand gas reservoirs quickly and identify whether there is tight sand gas. The correlation chart of reserves producing degree and main flow channel index can provide basis for recoverable reserves evaluation and well infilling, and provide technical support for evaluation and development and formulation of reasonable technical policy of gas reservoir.
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