The Describe Technology of Water Penetration Advantage Channel Based on Fracture Characterization of Ultra-deep Complex Structural Gas Reservoir

Fracture is a double-edged sword of gas reservoir science and efficient development, which is both the main control factor of gas well production capacity and the water intrusion channel of gas reservoir. In the complex carbonate gas reservoir, which is characterized by burial as ultra-deep layer, multiple faults, strong reservoir heterogeneity and fracture at different scales, it is difficult to depict the dominant channel of gas reservoir, which affects the formulation of technical countermeasures for gas reservoir development and restricts the scientific development of gas reservoir with water. Using core and sheet, FMI imaging logging, seismic prediction, structural interpretation, ground stress, production dynamic data, on the basis of describing fracture development characteristics, calculate the FMI imaging logging data explain fracture parameters, extract the seismic attribute prediction fracture distribution, calculate the ground stress size and direction, analyze the dynamic characteristics of water production gas well, based on fracture characterization advantage channel characterization technology, the combination of dynamic and static features depicts the dominant channel of gas reservoir water invasion. The results indicate that:①In Qixia Formation, the gas reservoir developed low angle joint, oblique seam, high angle joint and mesh seam, with the average joint density of about 1–20 m, low angle fracture developed higher than high angle fracture, and the development of high angle fracture is positively correlated with the capacity of gas well. ②The high permeability area of gas reservoir is distributed in strips, and there are 5 directions and 7 water intrusion channels. ③Develop three water intrusion along fracture water intrusion, along fracture water channeling and uniform propulsion along relatively low permeability area. The method and research results solve the problems of prominent water intrusion and unknown water source in the process of gas reservoir development, which are of reference significance for the description of fractures and characterization of deep-super deep complex carbonate gas reservoir characteristics of the same type.