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A Prestack Reverse Time Depth Migration Imaging Method for Interwell Seismic Offshore Inclined Wells

A technology of cross-well seismic and depth migration, which is 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, high imaging precision and high calculation precision

Active Publication Date: 2017-09-26
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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  • A Prestack Reverse Time Depth Migration Imaging Method for Interwell Seismic Offshore Inclined Wells
  • A Prestack Reverse Time Depth Migration Imaging Method for Interwell Seismic Offshore Inclined Wells
  • A Prestack Reverse Time Depth Migration Imaging Method for Interwell Seismic Offshore Inclined Wells

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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 pre-stack reverse time depth migration imaging method for cross-well seismic in inclined wells on the sea, comprising the following steps: 1) collecting or field construction seismic data between wells in inclined wells; 2) performing TTI medium tomography inversion on the seismic data The two-dimensional TTI medium migration model is obtained; 3) The cross-well seismic data of deviated wells are processed to obtain the converted wavefield and reflected wavefield for imaging; 4) The two-dimensional TTI medium migration model is networked 5) Use the first arrival ray tracing method to calculate the first arrival time of each grid on the gridded two-dimensional TTI medium migration model; 6) Based on the two-dimensional TTI medium migration model, the seismic data 7) Apply the imaging conditions to image the wave field values ​​of seismic data at different times in each grid to obtain the wave field values ​​between the inclined wells Seismic depth migration imaging section.

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,...

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Application Information

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Patent Type & Authority Patents(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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