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Longitudinal and transversal wave time difference positioning method based on base data technology

A technology of time difference positioning and database, applied in the field of microseismic monitoring in geophysical exploration, which can solve problems such as errors and inability to guarantee the real-time performance of microseismic monitoring

Active Publication Date: 2013-05-15
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

If the accuracy of inversion positioning cannot be guaranteed, wrong judgments may be drawn; if the speed of inversion positioning cannot be guaranteed, the real-time performance of microseismic monitoring cannot be guaranteed

Method used

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  • Longitudinal and transversal wave time difference positioning method based on base data technology
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  • Longitudinal and transversal wave time difference positioning method based on base data technology

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Embodiment Construction

[0031] First, several terms will be explained for the convenience of those skilled in the art to understand. And i, j, m, M, and I used in the present invention are all natural numbers.

[0032] First arrival time: When the seismic wave front reaches a certain observation point, the moment when the particle of the medium at this point begins to vibrate is called the first arrival time of the wave, referred to as the first arrival.

[0033] Arrival time: Different from the first arrival time, it is the time when the seismic wave of a microseismic event arrives at the observation point.

[0034] Below, refer to figure 1 and figure 2 The method for locating the time difference of compressional and shear waves based on database technology according to the present invention will be described in detail.

[0035] First, establish the first arrival time database, that is, write the first arrival time sets of the simulated P-wave and S-wave in one grid of the microseismic occurrenc...

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Abstract

The invention relates to geophysical exploration microseism monitoring technology, in particular to a longitudinal and transversal wave time difference positioning method with computational efficiency improved greatly, combined with data base technology and under the condition that computational accuracy is guaranteed. The method comprises that (1) microseism happening space zone is established and grid subdivision is performed; (2) a forward modeling result of P wave or S wave of each grid is written to a data base by ray tracing algorithm; (3) combined with an azimuth angle of an actual microseism happening space, whether an azimuth angle of the i grid volume i (x, y, z) is in a range (theta m-theta', theta m+ theta') determined by the azimuth angle of a microseism event is judged and if the azimuth angle of the i grid is in the given azimuth angle range (theta m-theta', theta m+ theta'), a spatial point volume i (x, y, z, theta m + / - theta') where a microseism can happen is determined; and (4) in a microseism happening space zone volume, optimal seismic focus location search is performed on all grid points volume i (x, y, z, theta m + / -theta') with the azimuth angle located in the (theta m-theta', theta m+ theta') according to a formula. According to the microseism seismic focus positioning technology of the longitudinal and transversal wave time difference positioning method based on the data base technology, positioning accuracy can be satisfied and speed is greatly improved. The technology is initiate technology in seismic monitoring positioning technology.

Description

technical field [0001] The invention relates to geophysical prospecting microseismic monitoring technology, in particular to a positioning method of longitudinal and transverse wave time difference combined with database technology. Background technique [0002] Microseismic monitoring is a geophysical technology that monitors the impact, effect and underground state of production activities by observing and analyzing small seismic events generated in production activities. The method is to receive micro-seismic waves (commonly known as micro-seismic events) when artificial fractures are generated in formations during fracturing construction through geophones arranged on the ground or in wells during the fracturing process of oil and gas reservoir exploitation and development. By performing a series of data processing techniques on the received microseismic events (P wave and S wave), the spatial position of artificial fractures is inverted, so as to predict the development ...

Claims

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Application Information

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IPC IPC(8): G01V1/30
Inventor 尹陈刘鸿李亚林何光明巫芙蓉陈爱萍巫骏
Owner BC P INC CHINA NAT PETROLEUM CORP
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