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Method for seismic detection of stratum deformation of nontectonic origin

A detection method and deformation technology, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve the problem of insignificant seismic reflection event dislocation, unsatisfactory micro-scale formation deformation effect, and weak plane distribution regularity and other problems, to achieve the effect of improving computational efficiency, reducing multi-solution, and high computational efficiency

Active Publication Date: 2019-02-15
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Problems solved by technology

[0005] Existing detection techniques based on seismic data for stratigraphic discontinuity information, such as coherence volume attributes, variance volume attributes, dip azimuth angle attributes, and edge enhancement attributes, are all proposed for stratigraphic discontinuity boundaries of tectonic origin. The effect of micro-scale formation deformation is not ideal
[0006] For stratum deformation caused by non-tectonic causes, especially karst subsidence and differential compaction, the traditional seismic attributes cannot be used for the formation deformation because of its weak plane distribution and the inconspicuous dislocation of seismic reflection events on the section. Describe the plane distribution of this type of formation deformation

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  • Method for seismic detection of stratum deformation of nontectonic origin
  • Method for seismic detection of stratum deformation of nontectonic origin
  • Method for seismic detection of stratum deformation of nontectonic origin

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Embodiment

[0054] In this embodiment, based on 3D seismic data, according to the seismic section event deformation and structural layer change data pairs, the non-structural causes, especially the formation deformation caused by karst collapse and differential compaction, are detected and analyzed, including the following steps:

[0055] 1) Based on the 3D seismic data, interpret the horizons of the target layer with a certain density, and grid the interpreted horizons to obtain the structural map of the target layer, and obtain the high and low values ​​of the structural horizons, such as image 3 As shown, different colors represent different depths. In this embodiment, the colors [RGB, (255,0,0)] (red), [RGB, (255,225,0)] (yellow) represent the formation height, and [RGB ,(160,32,240)] (purple), [RGB, (0,0,255)] (blue) represent low strata, and places where the color changes faster indicate faster structural changes.

[0056] 2) Perform edge detection on the structural horizon data, c...

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Abstract

The invention belongs to a method for seismic detection of stratum deformation, and particularly relates to a method for seismic detection of stratum deformation of nontectonic origin. The method is characterized by including the following steps: (1) tectonic horizon interpretation: interpreting a target layer based on seismic data to obtain a target layer tectonic map; (2) edge detection: carrying out edge detection on the target layer tectonic map, calculating the tectonic change gradient, and getting the edge detection result of the target layer tectonic horizon; and (3) qualitative and quantitative characterization: carrying out qualitative and quantitative characterization to get the distribution range and magnitude of stratum deformation. The method can be widely applied to oil sandreservoirs in Canada and offshore oilfields at home and abroad, and has certain popularization value.

Description

technical field [0001] The invention belongs to a formation deformation seismic detection method, in particular to a non-structural formation formation seismic detection method. Background technique [0002] Canada's oil sand assets have become an important overseas asset of CNOOC. Currently, one-fifth of Canada's oil sands reserves are mostly exploited in situ. Steam Assisted Gravity Drainage (SAGD) is one of the most widely used technologies at present. For this special oil sand development method, many geological factors will affect its development effect, and formation deformation is one of them. The existence of formation deformation will cause the heat in the steam chamber to escape along the formation, greatly reducing the development efficiency. Therefore, the prediction of formation deformation is very important for the efficient development of oil sands reservoirs. The formation deformation of oil sand reservoirs is mainly caused by karst collapse and differenti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 田楠王宗俊范廷恩胡光义宋来明董建华许磊王晖商志垒马良涛
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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