Microseism event forward modeling method based on reservoir geomechanical parameters

Abstract

The invention provides a microseism event forward modeling method based on reservoir geomechanical parameters. The microseism event forward modeling method based on the reservoir geomechanical parameters comprises the steps that pressure valuation is conducted on initial hydraulic fracturing, and the finite element method is used for model simulation; the stress of a rock unit at each specific moment is calculated according to time variation; whether the current rock unit is fractured or not is judged according to a stress calculation result in combination with rock fracturing criteria; porosity parameters are calculated; if the rock unit fractures, the magnitude of a focus is calculated in combination with a microseism focal mechanism; simulation at all moments is completed. According to the microseism event forward modeling method based on the reservoir geomechanical parameters, the calculation result can truthfully reflect the actual change conditions of a subsurface reservoir, and the method can be used for prediction of a microseism event in the process of subsurface cracking and fracturing.

Description

technical field [0001] The invention relates to hydraulic fracturing simulation in petroleum engineering and microseismic simulation in seismic exploration methods, in particular to a forward modeling method for microseismic events based on geomechanical parameters of reservoirs. Background technique [0002] Hydraulic fracturing is an important means to increase the production of unconventional oil and gas resources such as tight oil and gas and shale gas. During the fracturing process, monitoring the fracturing effect and proposing a perfect fracturing plan is of great significance for increasing production and reducing costs. Microseismic monitoring technology is the only effective means currently recognized for real-time monitoring of fracturing effects. During water or gas injection into low-permeability reservoirs, the movement of the fluid pressure front and the change of pore fluid pressure will be caused, thus triggering microseismic events. Through microseismic m...

AI Technical Summary

Problems solved by technology

[0003] At present, the mechanism of microseismic generation is not well understood, so the effect of microseismic data in practical applications needs to be further improved

Conventional microseismic forward modeling technology assumes that the source and propagation medium are known, and studies its travel time, amplitude, frequency and other propagation laws. It does not combine reservoir geomechanical parameters.