A Velocity Model Construction and Solution Method for Surface Monitoring Microseismic Location
A velocity model and micro-seismic technology, applied in seismic signal processing and other directions, can solve problems such as affecting positioning accuracy, occupying well resources, high production costs, and harsh monitoring conditions, so as to improve accuracy, simplify computational complexity, and prevent errors. Effect
Inactive Publication Date: 2017-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0004] The in-well monitoring method requires that there must be a monitoring well near the fracturing well. At the same time, this method occupies well resources and the production cost is relatively high. In addition, it also requires the spatial and lateral resolution of the observation instrument, so the monitoring conditions are relatively harsh in specific implementation.
Although ground monitoring also has disadvantages such as being greatly affected by environmental noise and the location of observation points affecting positioning accuracy, with the development of signal processing technology and the improvement of ground geophone performance, the positioning accuracy of ground monitoring microseismic is also continuously improving. Ground monitoring Fracturing microseismic positioning will take advantage of its low-cost advantage to become a future development trend
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[0043] The present invention provides a velocity model construction and solution method for ground monitoring and microseismic positioning, which mainly involves the S1 establishment, S2 solution and S3 correction process of the necessary velocity model from the data preprocessing process to the event positioning process. The following is the present invention detailed technical plan.
[0044] The S1: the establishment of the velocity model includes the following steps:
[0045] S11: Construction of the velocity model of the ground monitoring microseismic work area;
[0046] Considering the actual situation of the ground monitoring seismic positioning work area, we believe that the velocity propagation in the work area is mainly affected by the anisotropy of the formation, which mainly comes from: the effect of stress field, the effect of directional alignment of fractures, and the generation of fractures and thin interbeds. combination effect.
[0047] Since there are many si...
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The present invention provides a velocity model construction and solution method for ground monitoring microseismic positioning, based on the geophysical microseismic linear positioning method and anisotropic average velocity model for modeling, and realizes the three-dimensional space anisotropic velocity model Construct and optimize the solution. Compared with the traditional layered velocity model, the velocity model of the present invention is closer to simulating the actual formation velocity, and the solution process is simpler and more reasonable. At the same time, the present invention also prevents the difference of the layered velocity model due to ray tracing. The error brought by the optimization; the present invention establishes the residual vector between the observation time difference and the calculated travel time difference of the specified geophone pair within the scope of the work area, and establishes an optimized solution model on top of this, and can obtain The least squares solution of the velocity model, the least squares solution can invert the optimal velocity model, and based on this velocity model, accurate fracture event location can be realized.
Description
technical field [0001] The invention belongs to the field of microseismic monitoring, and in particular relates to a velocity model for ground monitoring microseismic positioning. Background technique [0002] Microseismic monitoring and positioning technology is a new technology emerging from the geothermal development industry. Since the technology was proposed in the 1970s, microseismic monitoring technology has been widely applied to dynamic monitoring of oil and gas reservoirs, dynamic monitoring of coal fields, and dynamic monitoring of geothermal engineering. And many other aspects, and achieved good application results. At present, in the process of unconventional oil and gas development, fracturing measures are mainly used to increase the production of oil fields. The fracturing measures have a very obvious effect on increasing the production of low-permeability oil fields and carbonate oil fields. Due to the underground rock fracture caused by fracturing activitie...
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IPC IPC(8): G01V1/28
Inventor 费高雷魏会东胡光岷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA