四川盆地高石梯-磨溪区块震旦系灯影组气藏为典型的大型深层碳酸盐岩气藏，受岩溶等因素影响，储层低孔低渗特征明显，非均质性强、孔洞搭配多样、渗流规律复杂，气藏精确描述难度大，严重制约了气藏开发有利区的优选和开发技术对策的制定。为解决此类气藏精确描述的难题，运用岩心描述和成岩解释形成了白云岩风化壳岩溶分带描述方法;运用数字岩心描述技术和融合地震解释技术形成了量化毫米级缝洞搭配和预测方法;运用三重介质储层试井诊断储层渗透性、形成岩溶性碳酸盐岩气藏开发有利区评价及优选技术。这套深层岩溶碳酸盐岩描述技术为该类气藏的开发政策提供了整套技术体系。

The Zengdan Dengying formation gas reservoir in Gaoshiti Moxi block of Sichuan basin is a large deep carbonate gas reservoir, affected by typical karst, has features of low porosity and low permeability, strong heterogeneity, diversified holes, complex seepage law, and great difficulty in exact gas reservoir description. Those features have seriously restricted optimization of gas reservoir and development of technical countermeasures. To solve those problems, this paper has formed dolomite weathering crust karst zoning description method with core description and diagenesis interpretation; forms quantitative millimeter-level fracture-cavity collocation and prediction with digital technology of core description and seismic interpretation technology; forms favorable development zone evaluation and optimization with triple media reservoir well test diagnosis. These techniques have provided a solid technical support for the favorable zone selection and policy formulation.