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Complex surface three-dimensional exploration first-motion wave time determining method

A technology of complex surface and determination methods, applied in seismic signal processing and other directions, can solve the problem of low first-arrival picking efficiency, and achieve the effects of improving processing quality, improving exploration accuracy, and improving efficiency

Active Publication Date: 2009-10-07
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

First-arrival picking is not efficient because these solutions require a lot of manual intervention

Method used

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  • Complex surface three-dimensional exploration first-motion wave time determining method
  • Complex surface three-dimensional exploration first-motion wave time determining method
  • Complex surface three-dimensional exploration first-motion wave time determining method

Examples

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Embodiment Construction

[0022] Specific examples of the present invention are:

[0023] 1. Acquire, read and display the seismic data of the pre-stack 3D shot set, which contains 3 arrays that are closer to the shot point. In order to reduce the data storage space, the data is intercepted, and only the part of the first arrival with a shorter time is retained, see figure 1 . At the same time, read the relationship information between the shot point and the receiving point.

[0024] 2. For figure 1 The shot set data shown is considered to have a high signal-to-noise ratio and can be identified as a seed shot. Pick up the first arrival of each channel of the seed cannon, see figure 1 The first middle solstice is marked.

[0025] 3. For figure 1 For the seed shot shown, set the shot point as the origin and establish a cross coordinate system. Place the shot point and all receiver points in the coordinate system. The coordinate plane is divided into upper, lower, left and right regions by two int...

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Abstract

The invention discloses a complex surface three-dimensional exploration first-motion wave time determining method utilized in oil geophysical prospection. The method is realized through the following steps: a sectorial subregion is divided by taking a shot point as a circle center in the area surrounding the shot point position of a seed cannon and a rectangular region; fitting a straight line to the first-motion wave time on the shot-geophone distance so as to obtain the slope of the straight line; the apparent velocity of each path of the seed cannon is calculated by utilizing weighted distance; a non-seed cannon surrounding the seed cannon and nearest the seed cannon is taken as an extrapolation object; and the time difference caused by the distance difference between the seed cannon and the non-seed cannon is calculated, so as to obtain the first-motion wave time of the non-seed cannon by calculating the time difference and the first-motion wave time of the seed cannon. The invention has the advantages that the first-motion wave estimating efficiency is improved by times; the handling quality is improved; the exploring accuracy is improved; and the first-motion wave time determining method of the position of stratum containing oil and gas is better carried out.

Description

technical field [0001] The invention relates to a reflection wave seismic data processing technology in geophysical prospecting, in particular to a method for determining the first arrival time of the surrounding non-seed shots by using the first arrival time of the three-dimensional seed shot and its apparent velocity to determine the first arrival time of the surrounding non-seed shot in three-dimensional exploration on the complex surface. Background technique [0002] With the advancement of exploration technology, the number of 3D seismic data collection is increasing, and the number of traces recorded by one shot has grown from hundreds to thousands or even tens of thousands, resulting in the workload of 3D first arrival picking getting bigger. In addition, complex surface conditions also change the quality of the first arrival signal, increasing the difficulty of picking up the first arrival. In this situation, fast and effective 3D first arrival picking technology h...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 陈宝孚刘超颖
Owner BC P INC CHINA NAT PETROLEUM CORP
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