Method for determining fracturing dynamic microseism event barrier region of unconventional reservoir infill well

Abstract

The invention discloses a method for determining a fracturing dynamic microseism event barrier region of an unconventional reservoir infill well. The method comprises the following steps: S1, establishing a three-dimensional geological model with physical and geomechanical parameters; S2, establishing a natural fracture network model in combination with indoor rock core-logging-earthquake monitoring; S3, calculating hydraulic fracturing complex fractures of the early-stage production well; S4, establishing a shale gas reservoir model and calculating a current pore pressure field; s5, establishing a dynamic geomechanical model and calculating a dynamic crustal stress field; s6, calculating horizontal fracturing complex fractures of the infill well in different production time based on the early complex fractures and the current crustal stress field; and S7, analyzing the fracturing microseism event barrier area of the infill well and the dynamic change of the fracturing microseism eventbarrier area. The method has the beneficial effects that the influence of fracture development shale reservoir exploitation on densification well fracturing can be accurately reflected, the dynamic change of the microseism event barrier effect in the exploitation process is determined, and a reliable basis is provided for optimization of the densification opportunity and fracturing construction parameters.

Description

technical field [0001] The invention relates to the field of oil and gas resource development and its production stimulation and reformation, in particular to a method for determining a barrier area for dynamic microseismic event fracturing of infill wells in unconventional reservoirs. Background technique [0002] The "barrier effect" of microseismic events is defined as: the distribution of microseismic events around infill wells is similar to that of old wells, but the magnitude and number of microseismic events will be significantly weakened near the previous production wells, or even undetected. When it comes to microseismic events, this phenomenon is called the “barrier effect” of microseismic events; corresponding to the “barrier effect” of microseismic events, the area close to the early production wells is called the “barrier area” of microseismic events. [0003] With the continuous exploitation of shale gas resources, many shale gas reservoirs in my country are gr...

AI Technical Summary

Problems solved by technology

Since the seepage of shale gas underground to achieve commercial production mainly depends on the complex fractures formed by volume fracturing, the "barrier effect" of microseismic events greatly limits the single well productivity of infill wells

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