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Method for establishing velocity depth model by using prestack gather data

A pre-stack gather and depth model technology, applied in seismology and seismic signal processing for logging records, can solve problems such as loss, poor guiding significance, high drilling cost, etc., and achieve error elimination and good imaging quality , Accurate effect of velocity depth model

Inactive Publication Date: 2019-06-04
成都捷科思石油天然气技术发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the structural map obtained according to the above processing flow chart guides drilling, it is easy to miss oil and gas reservoirs, resulting in huge losses
The cost of drilling is high, and the cost of a single well can be tens of millions, and the loss is very huge
Therefore, the structural map obtained by the above-mentioned processing flow is of poor guiding significance for geologists to determine underground well location targets in areas with complex geological structures such as large surface undulations, complex underground structures, and well-developed lateral overthrust fault zones on both wings. A composition map with guiding significance has become an urgent need

Method used

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  • Method for establishing velocity depth model by using prestack gather data
  • Method for establishing velocity depth model by using prestack gather data
  • Method for establishing velocity depth model by using prestack gather data

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Experimental program
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Effect test

Embodiment 1

[0156] Taking a region with complex geological structures such as large surface undulations, complex underground structures, and well-developed flank overthrust fault zones, image 3 Interpreted for time-domain comparisons, Figure 4 Interpret stereoscopic displays for time-domain comparisons; Figure 5 For the establishment of the time domain entity model, Figure 6 is the root mean square velocity volume (Vrms) of prestack time migration, Figure 7 is the interlayer velocity volume converted from the root mean square velocity volume by the DIX formula, Figure 8 Based on the layer velocity body, the layer velocity measured by well logging, mud logging and VSP is used for correction and then added to the comprehensive velocity body obtained by the solid model, Figure 9 It is a plane distribution comparison diagram of root mean square velocity (left), layer velocity (middle) and comprehensive velocity (right) along a certain layer, Figure 10 In order to use the time-doma...

Embodiment 2

[0159] Figure 20 It is a comparison between the old image of pre-stack depth migration profile imaging obtained by conventional methods and the new image of pre-stack depth migration profile imaging obtained by the method of this application in another work area. The well was fixed according to the old results. From the profile of the well, the target position data of the original design is relatively continuous, and there is no complicated situation. However, during the actual drilling process, there are complicated situations, which are quite different from the original design. . The new results obtained after using the method of this application for pre-stack depth migration have a certain improvement in profile imaging quality compared with the old results, and the position of the target layer height of the new results is about 500m westward offset from the old results. The position of the bottom of the well The continuity of the data on the depth migration profile is po...

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Abstract

The invention relates to the field of seismic data interpretation, and discloses a method for establishing a velocity depth model by using prestack gather data. The method comprises the steps of first, acquiring prestack gather data; second, acquiring a prestack time migration profile, and carrying out comparative interpretation; third, acquiring a comprehensive initial velocity field, and establishing a velocity depth model; fourth, carrying out prestack depth migration on the prestack gather data by combining the velocity depth model to obtain a depth profile, then carrying out comparative interpretation, establishing a depth domain entity model, picking up the residual velocity, further carrying out optimization and iteration on the velocity depth model, and judging whether the imagingis satisfactory or not after multiple iterations; and fifth, analyzing anisotropic parameters, acquiring a prestack depth migration profile, and acquiring a structure map by using the interpretation result. For complex geological structure areas such as server topographic relief, complex hinterland and well developed lateral overthrust fault zones on both flanks, the obtained structure map has small errors, thereby being capable of better guiding the determination of an underground well location target.

Description

technical field [0001] The invention relates to the field of seismic data interpretation, in particular to a method for establishing a velocity-depth model using pre-stack gather data. Background technique [0002] Seismic exploration is a geophysical exploration method that uses the difference in elasticity and density of underground media to infer the nature and shape of underground rock formations by observing and analyzing the response of the earth to artificially excited seismic waves. Seismic exploration is an important means of surveying oil and natural gas resources before drilling and is widely used. Seismic exploration is of great significance to guide drilling. [0003] At present, seismic data processing usually adopts figure 1 Process shown: [0004] 1. First, use the original geological data, mainly to obtain pre-stack gather data for source data and stacked shot data, and perform horizontal stacking to suppress interference waves; [0005] 2. Perform pre-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/40
Inventor 贺燕冰黄君张海杰唐大海王维雷治安张晓丹魏文豪王文文伍泽豪
Owner 成都捷科思石油天然气技术发展有限公司
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