Sedimentary Microfacies: Analysis Of Laws Percolation Of Xujiaweizi Area Of Volcanic Rock Fracturing Of Wells

Xujiaweizi deep special lithology gas reservoir(most is volcanic gas reservoir) is typical of big difference of permeability, severity inhomogeneity, complexity distribution of gas/water, pore structure complexity, rock type peculiar, lithology complexity, so we can conclude that it has special characteristic and difficulty in production quite different from normal gas reservoir. Nowadays, the number of volcanic gas reservoir witch has been found in the world is numbered, can not come into being some method and experience used for reference, so we must know volcanic gas reservoir more, develop gas well productivity and performance description of the reservoir research, also offer performance prediction of Xujiaweizi volcanic gas reservoir abundance technical foundation and sort the favorable development, which establish excellent foundation for the expedition of production, and the wise adoption of development project.According to the characteristics of volcanic reservoir, including the types of rocks and lithofacies, reservoir space, this paper studies static geological features of the volcanic reservoir in Xujiaweizi. On this basis, we have studied the formulas for calculating effective porosity and permeability of the volcanic reservoir, and have got the corresponding dates of effective porosity and effective permeability. Moreover, because of the specificity of volcanic reservoir, we have studied the characteristics of gas seepaging in the reservoir under a variety of circumstances, such as the homogeneous strata, the double dielectric formations and the formations with fracturing cracks, complex formations on the basis of the theory of fluid flowing through porous media, furthermore deduced the corresponding flowing equation and drawed the typically corresponding plate. then the testing interpretation were given according to the testing dates of some gas wells in Xujiaweizi region, and the characteristics of fluid infiltration were determined, the dynamic model of reservoir were set up. In the terms of the above research, This makes us have a relatively comprehensive and in-depth understanding to the deeply special lithologic gas reservoir in Xujiaweizi, and find out the effective method to evaluate the productive capability of it.