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Hydrofracture focal mechanism inversion method and system

A technology of hydraulic fracturing and focal mechanism, applied in seismic signal processing, seismology for logging records, etc.

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, looking at the entire field of oil and gas exploration and development, there is no relevant method research and application examples on the inversion of the focal mechanism of hydraulic fracturing fractures.

Method used

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  • Hydrofracture focal mechanism inversion method and system
  • Hydrofracture focal mechanism inversion method and system
  • Hydrofracture focal mechanism inversion method and system

Examples

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no. 1 example

[0053] It should be noted that the embodiment of the present invention provides a focal mechanism inversion method for ground microseismic monitoring data of hydraulic fracturing, and establishes a set of reliable, practical and efficient microseismic focal mechanism inversion process. The so-called "focal mechanism" is a concept introduced from the field of natural earthquakes, which refers to the mechanical process in the source area when an earthquake occurs.

[0054] The method of this embodiment mainly utilizes the information of the initial motion of the P wave to perform the inversion of the source mechanism of the hydraulic fracturing fracture. The theoretical basis is: when the pure shear dislocation of the fault occurs underground, the P wave seismic phase received on the ground has the characteristic that its initial motion polarity is distributed in four quadrants. figure 1 A schematic diagram of the shear dislocation fault model and its ground polarity distributio...

no. 2 example

[0084] Figure 11 is a structural schematic diagram of an inversion system for a hydraulic fracture source mechanism according to another embodiment of the present invention. Refer below Figure 11 To describe the structure and function of the system in detail.

[0085] Such as Figure 11 As shown, the system includes an azimuth calculation module 111 , a model building module 112 , a departure angle calculation module 113 , a P wave initial motion polarity determination module 114 and a nodal plane solution calculation module 115 . The above five modules execute step S110 , step S120 , step S130 , step S140 and step S150 in the first embodiment respectively, which will not be repeated here.

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Abstract

The invention discloses a hydrofracture focal mechanism inversion method and system, and the method comprises the steps: calculating the azimuths of all detectors relative to a hydrofracture focus according to the horizontal coordinates of all ground detectors; building a horizontal layered speed model through employing the interval transit time logging data of a hydraulic fracture well; calculating the take-off angle of each detector relative to the focus on the basis of the horizontal layered speed model, the focus positioning results, obtained through the processing of former microseism data, of a microseism event and the coordinate positions of the detectors; Determining the polarity of a first motion of a P wave according to the correlation coefficient of each recording channel to a standard channel; taking the azimuths and take-off angles of all detectors and the polarity of the first motion of the P wave as input, and obtaining the nodal plane solution of a fault corresponding to a minimum contradiction symbol ratio. The method achieves a high-efficiency and practical processing flow of the hydrofracture focal mechanism inversion through employing the information of the first motion of the P wave.

Description

technical field [0001] The invention relates to the field of oil reservoir development, in particular to an inversion method and system for the source mechanism of hydraulic fracturing fractures. Background technique [0002] In the field of oil exploration, the application of microseismic monitoring technology is mainly to monitor the fracturing process, evaluate the fracturing effect, and guide the optimization of engineering parameters by monitoring the microseismic signals generated during the hydraulic fracturing process. [0003] In North America, microseismic monitoring technology has been widely used in hydraulic fracturing fracture monitoring, reservoir dynamic monitoring generated by high-pressure injection operations, etc. , Accurate and timely monitoring technology. Microseismic monitoring technology is one of the important means for real-time monitoring of hydraulic fractures in the development of unconventional resources. [0004] In foreign countries, for ex...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/40
Inventor 杨心超朱海波郭全仕
Owner CHINA PETROLEUM & CHEM CORP
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