A combined well-ground microseismic positioning method

A positioning method and a joint positioning technology, which are applied in the fields of seismology, seismology, and seismic signal processing for well logging records, can solve the problems of large horizontal error and increased horizontal error, and achieve improved stability and improved The effect of microseismic positioning accuracy

Active Publication Date: 2021-08-24
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

Single well microseismic events have high precision in depth direction, but the horizontal direction error is large, and the horizontal direction error increases with the distance between the event and the monitoring well

Method used

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  • A combined well-ground microseismic positioning method
  • A combined well-ground microseismic positioning method
  • A combined well-ground microseismic positioning method

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0049] Such as figure 1 and Figure 4 It shows the steps of the combined well-ground microseismic positioning method of the present invention, including:

[0050] Step 1. Input the microseismic data of the well-ground joint monitoring, the P-s wave velocity model, and the initialization parameters. The initialization parameters include the initial source position, termination conditions and other parameters. The termination conditions include the maximum number of iterations, the minimum update value of the source position, and the travel time The minimum value of the resi...

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Abstract

The invention relates to a method for well-ground combined micro-seismic positioning, comprising step 1, inputting into the system micro-seismic data of well-ground combined monitoring, a P-s wave velocity model, and initialization parameters; step 2, identifying well-ground combined micro-seismic events and matching; Step 3, P-wave and S-wave travel time pick-up of well-ground microseismic events; Step 4, combined well-ground micro-seismic travel time positioning; Step 5, output micro-seismic event positioning results. The well-ground combined micro-seismic positioning method of the present invention combines the P-wave and S-wave travel time information of the surface micro-seismic in the well, and weights and fuses the number of geophones, travel time accuracy and positioning advantages of different data in the well and the ground, which is conducive to improving the micro-seismic positioning accuracy; In the method of the invention, the well-ground joint positioning equation eliminates the influence of the seismic time parameters, and improves the stability of the positioning method.

Description

technical field [0001] The invention relates to the field of microseismic data processing, in particular to a well-ground combined microseismic positioning method. Background technique [0002] Microseismic monitoring technology is one of the key technologies for the development of unconventional oil and gas resources, especially shale gas. Reservoir fracturing is the main means to increase the productivity of low-permeability oil and gas fields, and plays a very important role in unconventional oil and gas resources. The microseismic monitoring technology can describe the length, width, height and extension direction of the fractured body by positioning and imaging the microseismic events caused by reservoir fracturing, which helps oil and gas reservoir developers to monitor the effect of fracturing and optimize Fracturing construction design, adjustment development and water injection well pattern deployment. The development and application of microseismic monitoring tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/50
CPCG01V1/288G01V1/50
Inventor 程磊磊姜宇东
Owner CHINA PETROLEUM & CHEM CORP
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