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Angle domain common image gather obtaining method and system

A technology of co-imaging and angle domain, applied in the field of acquiring angle domain co-imaging gathers, can solve the problem of strong speed dependence, lack of efficient generation of angle domain co-imaging gathers, multi-process, multi-step offset information conversion Problems such as inaccurate angles

Inactive Publication Date: 2018-02-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has defects such as multi-process, multi-step, and the use of offset information conversion to obtain an inaccurate angle.
At the same time, the angle gather applications mentioned so far are mostly carried out in the seismic depth domain, and the seismic data processing process in the depth domain is complex and highly dependent on velocity
[0003] The inventors found that there is currently a lack of efficient methods for generating common imaging gathers in the angle domain. Therefore, it is necessary to develop a method for directly obtaining seismic ray angle information from the common middle point (Common Middle Point) data and directly generating common imaging gathers in the angle domain method and system

Method used

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  • Angle domain common image gather obtaining method and system
  • Angle domain common image gather obtaining method and system

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Embodiment approach 1

[0020] figure 1 A flowchart showing the steps of the method for obtaining an angle-domain co-imaging gather according to the present invention.

[0021] In this embodiment, the method for obtaining angle-domain common imaging gathers according to the present invention may include: Step 101, establishing a migration imaging model based on the common center point gather and the migration velocity field; Step 102, based on the migration imaging model, obtaining seismic ray travel time; step 103, based on seismic ray travel time, obtaining a first angle between the incident ray and the plumb line and a second angle between the reflection line and the plumb line; and step 104, Based on the first included angle and the second included angle, an angle-domain common imaging gather is obtained.

[0022] In this embodiment, the seismic ray angle information is directly obtained by means of migration based on the common center point gather and the migration velocity field, so as to real...

application example 1

[0057] In order to facilitate the understanding of the solutions and effects of the embodiments of the present invention, several specific application examples are given below. Those skilled in the art will understand that this example is only for the purpose of facilitating the understanding of the present invention, and any specific details thereof are not intended to limit the present invention in any way.

[0058] Image 6 A schematic diagram of a four-layer velocity model according to an application example of the present invention is shown. Among them, the horizontal axis represents the serial number of the common depth point gather, and the vertical axis represents the depth.

[0059] Specifically, such as Image 6 As shown, the velocity of the four layers is 1500m / s, 2500m / s, 3300m / s, 3700m / s respectively, 1000 points in the horizontal direction and 400 points in the vertical direction, and the sampling point interval is 10 meters. Forward modeling parameters: the s...

application example 2

[0063] Figure 8a and Figure 8b Schematic diagrams of acquiring angle-domain co-imaging gathers according to the method of the prior art and the method of the present invention are respectively shown. Wherein, the horizontal axis represents angle, and the vertical axis represents time.

[0064] Taking a certain actual data as an example, the offset range is (100m, 4875m), the track interval is 25m, and the angular domain common imaging gather is calculated with an angular resolution of 1 degree, which shows the different calculated travel times from 1300ms to 3000ms Angle-domain co-imaging gathers of the same imaging point.

[0065] like Figure 8b As shown, the angle-domain common-imaging gather obtained by the method of the present invention has higher accuracy, and the event of the angle-domain common-imaging gather is higher than that of the prior art (such as Figure 8a Shown) the results of the angle-domain co-imaging gather are more accurate, and the imaging effect...

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Abstract

The invention provides an angle domain common image gather obtaining method and system; the method comprises the following steps: building an offset imaging model according to a common-mid-point gather and an offset speed field; obtaining an earthquake ray travel time according to the offset imaging module; obtaining a first angle between the incident ray and a plumb line and a second angle between the reflected ray and the plumb line according to the earthquake ray travel time; obtaining the angle domain common image gather according to the first and second angles. The method considers a raybending effect and stratum inclination influences so as to obtain the true incidence angle, thus correctly homing the energy, and directly obtaining the angle domain common image gather by using the original earthquake data.

Description

technical field [0001] The present invention relates to the technical field of oil and gas geophysics, and more specifically, to a method and system for obtaining common imaging gathers in the angle domain. Background technique [0002] In the field of oil and gas geophysical technology, Angle Domain Common Image Gather (ADCIG) is an important link connecting seismic data processing and reservoir inversion, and has become a research hotspot in recent years. Since de Bruin proposed to calculate the variation of reflection coefficient of seismic data with angle in 1990, many scholars at home and abroad have carried out a series of research work on ADCIG. In 1999, Fomel and Prucha discussed the basic method of prestack time migration in the angle domain. The calculation of the incident angle is expressed by simple geometric relations through parameters such as migration speed, imaging depth (time) and offset distance; in 2001 Xu et al. pointed out that for Kirchhoff migration,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30G01V1/303G01V1/305
Inventor 刘志远刘喜武霍志周刘宇巍张远银
Owner CHINA PETROLEUM & CHEM CORP
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