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Well-to-well seismic pre-stack reverse-time depth migration imaging method for sea deviated well

A technology of cross-well seismic and depth migration, applied in seismology for well logging records, etc., can solve the problems that cannot meet the precision requirements of oil and gas development, and achieve the effects of fast calculation speed, wide adaptability and high calculation accuracy

Active Publication Date: 2015-03-04
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

In terms of velocity model calculation, at present, the logging interpolation model or the direct arrival wave tomography results of isotropic media are mainly used as the model input of depth domain migration imaging, and neither of these two models can meet the accuracy requirements of current oil and gas development

Method used

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  • Well-to-well seismic pre-stack reverse-time depth migration imaging method for sea deviated well
  • Well-to-well seismic pre-stack reverse-time depth migration imaging method for sea deviated well
  • Well-to-well seismic pre-stack reverse-time depth migration imaging method for sea deviated well

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] Such as figure 1 As shown, the pre-stack reverse time depth migration imaging method for off-shore inclined well interwell seismic of the present invention uses the single-shot seismic record received at the receiving point, that is, the single-shot seismic record before stacking and imaging, and calculates that the diffraction point begins to occur The waveform during diffraction is divided into three parts: the establishment of the two-dimensional TTI medium migration model, the calculation of imaging conditions, and the reverse time depth migration imaging, which specifically includes the following steps:

[0018] 1. Collecting or field construction to collect seismic data between wells in inclined shafts;

[0019] Such as figure 2 As shown, the process of collecting cross-well seismic data in the embodiment of the present invention is as...

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Abstract

The invention relates to a well-to-well seismic pre-stack reverse-time depth migration imaging method for a sea deviated well. The method includes the following steps: 1) collecting or having field construction acquisition for gathering the well-to-well seismic data of deviated well; 2) taking TTI medium chromatography inversion on the seismic data to obtain the two-dimension TTI medium offset model; 3) taking wave field treatment on the well-to-well seismic data of deviated well to obtain the converted wave field and reflection wave field used for imaging; 4) taking mesh generation on the two-dimension TTI medium offset model; 5) adopting the first-motion wave ray tracing method for calculating the first-motion wave time for each grid; 6) having wave field inverse continuation calculation on the seismic data based on the two-dimension TTI medium offset model to obtain the wave field value of the seismic data at different instants of time; 7) adopting the image-forming condition on the wave field value of the seismic data at different instants of time for imaging in each grid to obtain well-to-well seismic depth migration imaging section of deviated well.

Description

technical field [0001] The invention relates to the field of energy exploration and development, in particular to a seismic pre-stack reverse time depth migration imaging method between wells in inclined wells on the sea. Background technique [0002] The cross-well seismic wave field is rich, including both up-going reflection wave field and down-going reflection wave field. It is difficult to separate the wave field, especially in the case of an offshore inclined well. The difficulty is more obvious. Conventional reflected wave stacking imaging methods (such as VSP-CDP stacking imaging method) require the input to be a single wave field, so the poor separation of wave fields often leads to unsatisfactory imaging results. In addition, due to the continuous development of oilfields, interwell reservoir changes are relatively large, and anisotropy problems are more prominent. Therefore, there are always certain problems in conventional depth domain migration imaging methods,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40
Inventor 胡光义孙渊李绪宣范廷恩张显文马淑芳俞岱田建华范洪军赵卫平
Owner CHINA NAT OFFSHORE OIL CORP
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