Evaluation Method Of The Petrophysical Properties Of Volcanic Rock Reservoirs In Xujiaweizi Area

Evaluation of the petrophysical properties of volcanic rock reservoirs is the foundation of Interpretation of gas-bearing or water-bearing. It is important to study on evaluation method of the petrophysical properties of volcanic rock reservoirs,using compound logging data. By using observational compound logging data,correlation analysis of compound logging parameters and drillability of rocks is analyzed by making use of statistics theory,and evaluation parameters of volcanic rock drillability is established. Correlation analysis of drillability time and engineering factors or geological factors is established in the different lithogical conditions and different drill bit types. Relative engineering factor which can reflect feature parameters of rock characteristics and relative geological factor which can reflect feature parameters of reservoir property are extracted through weighted correlation coefficient and multiple regression analysis. by means of setting correlation coefficient and its contribution of engineering factors after the standardization and normalization, contribution of geological factor can be deducted in actual drillability time, and relative engineering factor of drillability time signals which can reflect reservoir property is obtained. "Relative engineering factor"reflecting the greater, the poorer reservoir properties. Using multiple regression, "relative geological factor"is calculated. Relative geological factor"reflecting the larger, the better reservoir properties. Accordingly the use of comprehensive logging data to evaluate volcanic reservoir Xujiaweizi evaluation model and evaluation criteria is established, and it is applied to volcanic reservoir evaluation. Volcanic reservoir evaluation methods are comprehensive study and discussion in the Xujiaweizi area. Not only enrich the study of volcanic reservoir theory, while the deep basin gas to accelerate the pace of exploration and development to realize leap-forward development of natural gas resources to provide some theoretical support.