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Shot point shifting method based on terrain factors

A technology of terrain factor and shot point offset, which is applied in the field of geophysical exploration and can solve problems such as offset

Inactive Publication Date: 2014-02-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But currently, there is no method to automatically determine the best shot point position for offset based on terrain factors

Method used

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  • Shot point shifting method based on terrain factors
  • Shot point shifting method based on terrain factors
  • Shot point shifting method based on terrain factors

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specific Embodiment

[0038] This specific embodiment can be applied to the observation system design of mountain construction. By using the slope of the terrain factor to encrypt the offset of the shot point, it can make up for the lack of coverage caused by too many empty shots in complex terrain. At the same time, the same observation system can also be used to determine the offset The comparison of coverage times before and after shifting, the specific implementation steps are as follows:

[0039] (1) Work area observation system and basic data

[0040] Observation system: 32L3S180R, track distance 50 meters, shot point distance 100 meters, receiving line distance 200 meters, shot line distance 200 meters; the southern part of the work area has large undulations, and construction is difficult in some areas.

[0041] To determine the offset position of the shot point of the observation system, the digital elevation model of the work area (such as image 3 shown), calculate the slope digital mod...

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Abstract

The invention provides a shot point shifting method based on terrain factors. The shot point shifting method comprises the steps that terrain factor gradient values of a work area are calculated according to a work area digital elevation model, and a work area gradient digital model file is obtained; according to the work area gradient digital model file, a bilinear interpolation method is utilized to obtain gradient values of all shot points; according to gradient values and set gradient limiting values of the shot points, shot points needing to be shifted are determined; within longitudinal and transverse shifting limiting value ranges of the shot points needing to be shifted, positions meeting requirements of the set gradient limiting values are selected, and the shot points needing to be shifted are shifted. According to the shot point shifting method based on the terrain factors, when seismic acquisition construction is carried out on a mountainous region with high terrain fluctuation, the best shifting positions of the shot points can be precisely calculated through quantification of terrain factor gradients, it is guaranteed that covering frequency distribution meets an acquisition design requirement through shot point shifting, shallow and middle layer data are obtained, and therefore a reference is provided for lay-out design of a three-dimensional seismic acquisition observing system.

Description

technical field [0001] The invention relates to geophysical prospecting technology, in particular to a method for offsetting shot points based on terrain factors. Background technique [0002] When carrying out exploration and construction in complex mountainous areas, due to the complex surface terrain and large undulating height difference, it is impossible to deploy shot points in some high and steep mountainous terrain areas, resulting in reduced coverage times and missing shallow data. In order to increase the number of coverage and ensure shallow data, it is necessary to offset and intensify the shot points that cannot be normally deployed in high and steep areas in gentle slope areas. [0003] At present, the offset and encryption of shot points in high and steep mountainous areas are determined by construction personnel's on-the-spot observation or empirically with the help of satellite images, which often has large errors and is time-consuming and labor-intensive. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/04G01V1/104
Inventor 胡永贵倪宇东刘丽施丽娟白志宏李伟波李平李海翔
Owner BC P INC CHINA NAT PETROLEUM CORP