The Method Study Of Fractured Reservoir Logging Identification And Evaluation

With the rapid development of petroleum industry and the huge demand for energy in the world, the exploration and development of fractured reservoirs is particularly important. The foundation of fractured resevoir exploration is the identification and evaluation of fracture reservoir. Based on the domestic and foreign scholars on the basis of the research work of fractured reservoir, the article makes the tight sandstone reservoir in southwest Sichuan as the research object, we studied the identification and evaluation of fracture. In the paper, the main research work and research results are the followings:(1)In order to improve the fracture identification precision of the electric imaging logging, we make filtering process for the electric imaging logging of the study area. It enhanced the fractures information and improve the fracture identification precision with the electric imaging logging on some extent.(2)In this paper, we use wavelet transform, median filtering and average filtering to filter logging datas for the electric imaging logging and conventional. We make correlation analysis of filtering datas and fracture density as the basis. Then, the median filtering can identify fracture morphology and position commendably. The wavelet transform filtering can identify the fracture development zone primely.(3)Based on the filtering datas of conventional logging, we establish fracture indicating curves to identify fracture develpoment zone, we know that using the single logging method to identify fractures will have a greater error. We need to use several well logging methods and fracture index curves, to build a comprehensive fracture indication curves which can be used to identify fractures. The result can correspond well to which used by imaging logging data, the recognition effect is good.(4)We use conventional logging datas to calculate fracture parameters and contrast the fracture parameters with the divided fractured reservoir degree by FMI imaging logging. Then, we get the fractured reservoir grading standard of convention logging.(5)Based on the fractured reservoir classification, we combine the fracture width and permeability with fracture density to establish the standard of reservoir classification.We contrast the classification standard with fracture porosity, secondary porosity, fracture probality and fracture fracal to get the fractured reservoir classification standard of convention logging.