A microseismic monitoring method for shale gas volume fracturing

Abstract

The invention discloses a shale gas volume fracturing microseismic monitoring method, which belongs to the technical field of oil and gas production stimulation. The method includes: selecting a monitoring well based on the maximum monitoring range of the shale gas platform well, the cementing quality of the instrument deployment position, background noise and actual construction needs; reducing the monitoring well liquid level to a preset value below the ground; Set up a high sampling rate geophone in the vertical section of the monitoring well; use well logging curves to establish an initial velocity model; calibrate and optimize the initial velocity model based on perforating events or detonating cords, and perform azimuth correction on the high sampling rate geophone; The original microseismic signal undergoes preprocessing such as horizontal component rotation and filtering; based on the microseismic records received by the high-sampling rate geophone, the calibrated and optimized initial velocity model is used to calculate and display microseismic event information. The invention greatly improves the accuracy of microseismic monitoring of shale gas platform wells and can provide on-site fracturing engineers with reasonable suggestions in a timely manner.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas stimulation, in particular to a microseismic monitoring method for shale gas volume fracturing. Background technique [0002] Microseismic monitoring is a technical method of using high frequency seismographs to monitor the distribution of microseismic, and it is an important research direction in geophysics. This technology monitors the distribution of micro-seismic, and then interprets the orientation and shape of fractures, so as to evaluate the fracturing effect and guide the fracturing construction. Microseismic monitoring has very important guiding significance for the optimal design of fracturing construction, the rational layout of overall development, the correct layout of water injection well pattern, and the efficient exploitation of oil and gas resources in low permeability oil and gas fields. The main task of microseismic monitoring is to use the weak seismic waves record...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that conventional downhole microseismic monitoring is not very pertinent to shale gas platform wells, the monitoring accuracy is low, and the abnormal conditions in the fracturing process of platform wells cannot be described in real time and accurately. Noise impact and other issues, the present invention provides a shale gas volume fracturing micro-seismic monitoring method, the method comprising:

Images