The Research Of Permeability Of Xujiahe 2 Member Gas Reservoirs On The Block Of Hechuan 1 Well In Hechuan Gasfield

Permeability is a important parameters of evaluation and mining of fluid mineral reservoir, it is a problems that the geologist, development engineer, log analysts strive to solve. It has very prominent importance in the oil and gas industry, both test wells and non-test gas, it is a decisive factor. Permeability also play an important role to the management and improvement of integrated reservoir.But the individual differences and strong heterogeneity of rock lead to prediction of permeability is difficult to find a common, universally applicable predictive model. This thesis take the permeability of Xujiahe 2 Member gas reservoirs on the block of Hechuan 1 well in Hechuan gasfield as the research object. First, author created a new model for permeability prediction, and through comprehending core test and log data, author obtained empirical formula of permeability of work area , then a detailed analysis of permeability of the work area has been completed.The main contents and results are as follows:1. After analysis, we found that the porosity is generally higher, the higher its permeability, and generally showed a logarithmic relationship,rock permeability are increased with decreased stress,with the shale index in layer increased, the permeability will eventually lead to a sharp down,the formation resistivity is a main factor affecting change of permeability.Author selected porosity, stress, shale index and resistivity as the parameters of model, and to establish a new model of permeability.2. Through acoustic testing data of core, the mechanical parameters were calculated, the analysis of rock's stress was finished carefully. And combined with porosity, permeability, resistivity and gamma test data of core, author established a empirical formula of Xujiahe 2 Member gas reservoirs on the block of Hechuan 1 well in Hechuan gasfield following the model of permeability.3. Using acoustic test data and density test data of the core, author established a empirical formula of shear velocity in the area, and combined with conventional log data, author completed the analysis of stress and the interpretation of porosity and shale content, finally permeability of the welles in work area was calculated according to the empirical formula.4. Through the calculation of permeability of 53 wells in the work area, author analysed the permeability distribution of the work area. The range of permeability is 0.3-2.8 MD, the wells of Hechuan 001-2, Hechuan001-5, Hechuan 001-13-x1, Hechuan 001-34-x1 and Hechuan 001-23-x1 were relatively in high value area.5. By calculating the parameter kφh (1 ?Sw), the beneficial regiones in work area were predicted, Hechuan 001-13-x1 Well field, Hechuan 001-23-x1 Well field, Hechuan 001-34-x1 Well field, Hechuan 001-8-x2 Well field, Hechuan 108 Well field, and Hechuan 118 Well field were the advantageous area.6. This method is suitable for medium and low permeability reservoirs. Because the permeability's empirical formula based on the analysis of core.When select the cores, the permeability of cores in the region of high, medium and low range must be selected, so the method is applicable. Only for fracture reservoires, because of the limitations of sampling, the results will be affected.