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Position determination method and depth determination method for underground high-speed layer top interface

A determination method and technology of the top interface, applied in the field of surface exploration, can solve problems such as the inability to accurately determine the top interface of high-speed layers

Active Publication Date: 2015-01-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, this method of judging which two excitations the high-velocity layer top interface is in cannot accurately determine whether the high-speed layer top interface is between the two excitation points in the logging, that is, whether the logging has penetrated the high-speed layer top interface. layer top interface

Method used

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  • Position determination method and depth determination method for underground high-speed layer top interface
  • Position determination method and depth determination method for underground high-speed layer top interface
  • Position determination method and depth determination method for underground high-speed layer top interface

Examples

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example 1

[0134] Example 1: DW01 seismic micro-logging in the desert area of ​​the Junggar Basin, Figure 7 For the far and near arrangement of the observation receiving points on the ground, 10 receiving points are designed for the near arrangement, with distances of 1m, 2m, 3m, 4m, and 5m respectively. Two geophones are placed at each distance point to receive, and the wellheads are respectively symmetrical on both sides. The present invention predicts and designs that the far offset distance is 250m. In order to ensure the success of the experiment, 6 receiving points are arranged on the two grounds of symmetrical wellheads, and the distances are respectively 225m, 250m, and 275m; Table 1 is the layout track number and the corresponding wellhead The offset distance; Table 2 shows the excitation depth in the well corresponding to the excitation serial number;

[0135] road number

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25

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39 ...

example 2

[0140] Example 2: DW02 seismic micro-logging in the Gobi area of ​​the Junggar Basin, Figure 11 It is the time-depth curve drawn after the vertical correction of the 3m offset of the well. Through the interpretation, the medium structure model of the shallow surface layer 5 is obtained. The thickness of the top interface of the high-speed layer is clearly displayed as 32.4m, and there are 19-20 excitation points at the bottom of the well Entered the high-speed layer; Figure 12 is the 25m, 50m far offset receiving point domain gather display of the well, and the present invention predicts and designs the far offset distance is 30m, in order to ensure the success of the experiment, two ground layouts at the symmetrical wellhead 4 receiving points have been selected; from the analysis of the results displayed by the gathers, there has been an inter-track time difference at the 25m offset distance, although the time difference is very small, their boundaries can be clearly disting...

example 3

[0141] Example 3: DW03 seismic micro-logging in the desert area of ​​the Junggar Basin, Figure 13 It is the time-depth curve drawn after the vertical correction of the 3m offset of the well. Through the interpretation, the medium structure model of the shallow surface layer 9 is obtained. The thickness of the top interface of the high-speed layer is clearly shown as 272m, and there are 4 excitation points at the bottom of the well that entered the high-speed The strange thing here is that the speed of the high-speed layer is 2857m / s (generally 1900m / s-2200m / s); Figure 14 It is the 400m far offset receiving point domain gather of this well shows that the far offset distance predicted and designed by the present invention is 350m. In order to ensure the success of the experiment, 6 receiving points are arranged on the two grounds of the symmetrical wellhead, and the distances are 300m respectively. , 350m, 400m; in principle, the distance of 400m should be obvious in the last ...

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Abstract

The invention relates to the field of earth surface exploration, in particular to a position determination method and depth determination method for an underground high-speed layer top interface. According to the position determination method and depth determination method, earthquake waves emitted by multiple excitation points arranged in a logging well are acquired through one or more detectors so as to determine the time of arriving at the detectors of the earthquake waves emitted by each excitation point; whether the difference value between the first time of arriving at the detectors of the earthquake waves emitted by the appointed first excitation point and the second time of arriving at the detectors of the earthquake waves emitted by the appointed second excitation point is smaller than a preset first difference value is judged; if yes, it is determined that the high-speed layer top interface is located between the first excitation point and the second excitation point, accordingly, it is determined that the logging well provided with the excitation points have been punched through the high-speed layer top interface, and therefore the shortcomings of the prior art are overcome.

Description

technical field [0001] The invention relates to the field of surface exploration, in particular to a method for determining the position of the top interface of an underground high-speed layer and a method for determining the depth of the top interface of an underground high-speed layer. Background technique [0002] The method of using drilling to obtain the layer velocity and thickness of seismic waves in the shallow surface geological structure is called seismic micro-logging, which plays an important role in the processing of seismic exploration data. Seismic micro-logging is to record the compressional waves that directly penetrate the rock formation. There are two methods: such as figure 1 As shown in ① explode on the ground, the geophone is placed in the borehole at different depths to receive; and as figure 2 ② shown in ② explodes at different depths in the borehole, and the geophones are received on the ground. ( figure 1 and figure 2 Inverted, figure 2 is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/42G01V1/28
Inventor 薛为平娄兵姚茂敏范旭潘龙
Owner PETROCHINA CO LTD