| Along with our country successively found, carat, puguang2in a large gas reservoir,such as natural gas exploration and development to know the degree of improvement. Atpresent, have discovered large and medium gas reservoir has more than hundreds, forming themain control factors of gas reservoir is cover closed on the underlying reservoir preservationrole. According to the statistic of our country has been found of large and medium-sized studyfound, can be different according to its reserves abundance, divided into including abundanceof gas reservoir. These provide different reserves abundance of gas reservoir are statisticalstudy found that different abundance of gas reservoir not only in life, there is a certaindifference, the conditions of block also exist certain differences, on the basis of the existingresearch data and published literature, systematic analysis of the low abundance of gasreservoir cap rock, strata distribution, distribution, and the properties of low abundance of gasreservoir caprock development mode; Low-medium abundance micro gas reservoir caprocksealing ability and high abundance ratios gas reservoir, low abundance with partial separationbetween cap rock and reservoir layer is relatively developed, and the low displacementpressure of caprock is characteristic.Through research the drilling and seismic data, combined with fracture and its influenceon cover the coupling relationship between the two, summed up the cover layer to formdifferent reserves abundance gas reservoir: the role of low abundance fracture gas reservoirdoes not develop or only small amounts of fracture, crack development, through these faultsand cracks can increase the ability of conducting oil and gas and the widespread accumulation.Finally summed up two accumulation models:High abundance ratios gas reservoir gas models for regional cap rock mass efficient; Lowabundance of local gas reservoir cap rock block, regional caprock comprehensive control ofgas models for low efficiency. |
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