A microseismic monitoring method for shale gas volume fracturing

Abstract

The invention discloses a shale gas volume fracturing micro-earthquake monitoring method, and belongs to the technical field of petroleum and natural gas production increasing. The method comprises the steps that a monitoring well is selected according to the maximized monitoring range, instrument deployment location cementing quality, background noise and actual construction requirements of a shale gas platform well; the liquid level of the monitoring well is reduced to a preset value below the ground; a high-sampling-rate detector is arranged at the vertical section of the monitoring well; an initial velocity model is established by utilizing a logging curve; the initial velocity model is calibrated and optimized according to a perforating event or a detonating cord and azimuth correction is performed on the high-sampling-rate detector; horizontal component rotation and filtering and other preprocessing are performed on original micro-earthquake signals; and micro-earthquake event information is computed and displayed by utilizing the calibrated and optimized initial velocity model according to micro-earthquake records received by the high-sampling-rate detector. Precision of shale gas platform well micro-earthquake monitoring can be greatly enhanced, and reasonable proposals can be timely put forward to onsite fracturing engineers.

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:

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