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裂缝性气藏的储集层特性四川盆地的碳陵盐岩和碎屑岩含油气地层是一套粒间孔隙度低于6％,渗透率小于1毫达西的脆性岩层。四川运动(喜玛拉雅期)产生的构造缝,使上述岩层具有总孔隙度低和渗滤能力特别高的特性。钻井放空、漏失和强烈井喷,录井中常见方解石或石英晶体等裂缝显示。气井的产量远远高于粒间孔隙的渗滤能力,可达数倍、甚至数百倍。裂缝发育程度的不均一性,常造成同一背斜、同一产层气井产量相差悬殊。构造缝的渗滤能力与其张
Reservoir Characteristics of Fractured Gas Reservoirs Carboniferous salt rocks and clastic hydrocarbon-bearing formations in the Sichuan Basin are a set of brittle rock formations with intergranular porosity less than 6% and permeability less than 1 md. The tectonic seams produced by the Sichuan movement (Himalayan period) make the above-mentioned rock formations have the characteristics of low total porosity and particularly high percolation capacity. Drilling venting, loss and strong blowout, logging common calcite or quartz crystal cracks show. Gas well production is much higher than the percolation ability of intergranular pores, up to several times, or even hundreds of times. The heterogeneity of the degree of fracture development often results in the same anticline and the production of gas wells in the same formation is quite different. Structure of the joint percolation ability and its Zhang