A Method For Extracting Log Characteristic Parameters And Evaluation Tenique Of Tight Sandstone Gas Reservoir

A method for extracting log characteristic parameters and evaluation tenique of tight sandstone gas reservoir is aided financially by the important science technology research and develop item a research on log identification and fine evaluation of Neopaleozoic tight sandstone gas reservoir. The contract number is P04016 and it takes two years from 2004 to 2006. The research target area lies in the Tabamiao region of Ordos basin and the intended zone is Permo-Carboniferous.According to the geology and well test data of Neopaleozoic tight reservoir in Tabamiao region, we begin with the conventional log response characteristic analysis and extract the classification ratio parameters to visual identify and evaluate reservoir characteristic. That is the lithologic, electric and physical ratio parameters and gas synthetical characteristic exponent. It offers the technical condition for the reservoir fine evaluation with log data.Based on the research of reservoir lithology, electric property, physical property, depositional environment, gas property and distribution in different area, the multiwell synthetical comparison is carried on. A pattern of gas reservoir classify identification and evaluation is offered. Then we divide the reservoir (He3, He2, He1, Shan2, Shan1, Tai2) into five types in different region and formation. That is high production gas(â… ), middle production gas(â…¡), low production gas(â…¢), water content gas(â…£) and dry. Further study and analysis on the applicability of fluid distinguish criterion shows good effect. For Neopaleozoic gas reservoir system, we make advanced research and set up two suits of gas AOF log predictive intermode. Use gas log classification ratio method, the gas log deliverability calculation relationship is set up with K parameter. Based on log response characteristic, the gas log deliverability optimal combination mode is set up with mathematic synthesis method. It settles the foundation for correctly evaluating ten hundred million deliverability of Neopaleozoic gas reservoir.Choose the test wells in different well fields as key wells. By comparative analysizing the log parameters and geologic information of test zones, we make the equivalent 2D plane distribution relationship of log net thickness, effective porosity, permeability, gas saturation and AOF in Taiyuan, Shanxi, He1 and He2+3. In view of the above we evaluate the Tabamiao gas concentrated block and indicate the gas concentrated payable zone and exploratory orientation.