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An Anisotropic Vector Wave Field Well-Ground Coordinated Positioning Method

An anisotropic and joint positioning technology, which is applied in the seismology of well logging records, etc., can solve the problems of different microseismic longitudinal and shear wave travel times and propagation paths, and cannot ensure high-precision positioning of microseismic events at the same time, and achieves optimization. Well layout and error controllable effects

Active Publication Date: 2021-08-24
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In the development of microseismic fracturing in unconventional tight sandstone gas and shale gas reservoirs, the formation is heterogeneous and belongs to anisotropic medium, and the travel time and propagation path of microseismic P-S waves are different from isotropy. Whether it is Neither the microseismic in the well nor the microseismic on the ground can guarantee the high precision positioning of the radial and depth directions of the microseismic event at the same time

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Embodiment 1

[0071] The invention provides an anisotropic vector wave field well-ground joint positioning method. This method obtains the initial positioning results of microseismic events by performing correlation analysis on the amplitude of the surface microseismic longitudinal and transverse wave vector field, and then conducts microseismic perforation positioning analysis in anisotropic wells to obtain perforation anisotropy parameter values ​​as microseismic events. The initial anisotropy parameters of the event, and finally through the microseismic P-S wave tomographic positioning analysis in the anisotropic well, the microseismic event positioning results with higher accuracy and the corresponding corrected microseismic event anisotropy parameters are obtained. In short, the present invention first carries out ground microseismic positioning to obtain stable initial positioning results, and then combines microseismic positioning in wells to obtain high-precision positioning results....

Embodiment 2

[0118] In this embodiment, the existing in-well microseismic model data is used to verify the accuracy of the microseismic event location results obtained by the method of the present invention.

[0119] Such as figure 2 As shown, the model is three layers of horizontal layers, the deepest layer is anisotropic, and the other two layers are isotropic, and the microseismic signals are monitored jointly on the ground and in the well. Among them, the number of ground detection geophones is 86 and it is 2-component receiving (divided into radial component and vertical component) (located at figure 2 A series of triangles with a middle depth of 0), in-hole monitoring uses a 32-level downhole geophone (located at figure 2A series of triangles in vertical coordinates), a total of 60 event signals (including a perforation signal) are set (a series of solid circles located on the third layer of the model), the distance between ground geophones is 20 meters and the radial The direct...

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Abstract

The invention provides an anisotropic vector wave field well-ground joint positioning method. The method includes: using the ground vector detector to collect downhole micro-seismic signals, preliminarily locating the micro-seismic events, and estimating the initial positioning results of the micro-seismic events; establishing an anisotropic vector wave field well-ground joint positioning target equation OPJ; picking up the well-observed Based on the obtained perforation P- and S-wave travel time, combined with the known perforation spatial position and acoustic logging P- and S-wave velocity, the target equation OPJ is used to perform positioning analysis on the perforation, and the anisotropy parameters of the perforation are retrieved; The perforation anisotropy parameter is used as the initial anisotropy parameter of the microseismic event, the initial anisotropy parameter of the microseismic event is used as the parameter constraint, and the initial positioning result of the microseismic event is used as the spatial constraint. Within the disturbance range, the objective equation OPJ performs further tomographic positioning processing on microseismic events to obtain the final positioning results of microseismic events with higher positioning accuracy.

Description

technical field [0001] The invention belongs to the technical field of microseismic monitoring signal processing, and in particular relates to an anisotropic vector wave field well-ground joint positioning method. Background technique [0002] Microseismic fracturing monitoring technology is one of the key technologies in the development of oil and gas fields in unconventional tight sandstone gas and shale gas reservoirs. According to the seismic source information located by inversion, fracture attributes (principal stress direction, fracture width, density etc.), used to evaluate fracturing effects, analyze fracture induction rules, optimize well layout, etc. Therefore, in microseismic signal processing, the ultimate goal is source location, also known as the core technology of microseismic signal processing. [0003] Microseismic monitoring is mainly divided into surface microseismic and borehole microseismic. The characteristic of surface microseismic is that conventio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/40
CPCG01V1/40
Inventor 余波
Owner CHINA PETROLEUM & CHEM CORP