Changqing Kyi Tableland Area Is Low Porosity Low Permeability Formation Permeability Logging Prediction Research

Permeability of reservoir logging prediction is one of the important contents of fine logging interpretation. This article from the commonly used methods to calculate the permeability of, by use of nuclear magnetic resonance logging method of calculating permeability, finally to the use of Stone wave calculation of fracture permeability, a comprehensive study of the methods for quantitative prediction of formation permeability. From sonic logging information extraction of permeability is more logging is an important research topic in the. Although the permeability of borehole acoustic wave propagation effects have been studied for decades, but in fact from sonic logging extracting permeability is thing of nearly ten years.Along with the development of Changqing Oilfield Exploration and development continues, the complex lithology with low porosity and low permeability reservoir has become the main exploration target. At present, Changqing Jiyuan area formation for low permeability micro fractured sandstone, permeability is poor, almost all well reservoir after hydraulic fracturing and acidizing fracturing is productivity. The study on permeability is not limited to the pores of the matrix, the fracture permeability evaluation is more important. Using pre fracturing full wavetrain acoustic logging data can effectively identify the natural fissures and controlling fracture height after fracturing, using full wavetrain acoustic logging data can be effective evaluation of fracturing effect,expecially the calculation of fractured formation permeability.Therefore, this article to the Yanchang Formation in the reservoir permeability logging prediction as the main line, to carry out the following research work:(1) based on the reservoir properties of experimental data, using the core calibration logging method, establishment of Yanchang formation permeability and porosity relation, porosity and acoustic, density logging value relation, and with the experience formula method to calculate permeability compared;(2) the use of nuclear magnetic resonance logging data to calculate the permeability of the formation, and the calculated results were compared with core data;(3) in the study of dipole shear wave logging principle and analysis of different company logging instrument working mode and characteristics based on LEAD platform, using demultiplexing dipole shear wave logging data (XTF or DLIS format), three wave time difference extraction, while on Stone wave wave field separation method, realizes the direct wave, Stone using reflection wave and reflection wave under Stone Stone the effective separation; based on the above three kinds of waveform data, focusing on computational reflection coefficient, fluid mobility index and permeability, while the use of pressure, pressure after Borris lee wave calculation of permeability, fracture effectiveness evaluation;(4) based on the above model, the LEAD software process10well logging and dipole shear wave logging data, and reference nuclear magnetic resonance logging interpretation result, gives the target layer permeability prediction results.Study found that, for low porosity and low permeability formations, from full wavetrain acoustic logging data to extract Stone wave information to predict permeability, reasonable and feasible and has high precision, it is worthy of popularization and application.