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VSP accurate horizon calibration method and system based on ray theory

A technology of horizon calibration and ray theory, applied in the VSP precise horizon calibration method and system field based on ray theory, can solve problems such as difficult calibration results, inapplicability to complex structures, and impact on seismic interpretation, and achieve high computational efficiency

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional VSP time-depth calibration technology does not fully consider the VSP time-depth relationship, and ignores the difference between VSP time and imaging processing time. This method has little impact on the interpretation of simple horizontal formations, but it is not suitable for complex structures
Conventional VSP assumes a horizontal layered medium model, but when faced with non-horizontal complex strata or structures, there will be large errors in time-depth calibration, which will lead to inaccurate horizon calibration and seriously affect seismic interpretation.
[0004] At present, VSP horizon calibration in seismic processing mostly adopts manual processing. When there is an error between the horizon obtained by VSP data and the actual level, it needs to be manually adjusted to obtain the correct position, and the manual adjustment method requires a large amount of work. Human subjective consciousness is dominant, it is easy to obtain non-unique results due to different personal experiences, and it is difficult to obtain accurate calibration results

Method used

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  • VSP accurate horizon calibration method and system based on ray theory
  • VSP accurate horizon calibration method and system based on ray theory
  • VSP accurate horizon calibration method and system based on ray theory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Such as figure 1 As shown, the method includes:

[0067] Step 1: Establish a seismic forward modeling model based on the seismic data observation system and logging data:

[0068] The seismic data observation system can determine the relationship between the source excitation and the receiving position of the geophone, and the formation dip angle and velocity model can be determined by using VSP data and logging data, so as to establish the seismic forward modeling model. The method of establishing the seismic forward modeling model is realized by the existing technology That is, it will not be repeated here.

[0069] Step 2: According to the seismic forward modeling model, calculate the accurate travel time t of the upgoing wave by the ray minimum travel time method acc and VSP upgoing wave travel time t VSP ,

[0070] t acc =2H d / v (1)

[0071]

[0072] Among them, H d is the formation depth, v is the seismic wave propagation velocity, θ is the formation d...

Embodiment 2

[0092] The system includes: a memory, a processor, and a computer program stored on the memory, and the computer program is executed by the processor to perform the following steps:

[0093] Step 1: Establish a seismic forward modeling model based on the seismic data observation system and logging data:

[0094] Step 2: Calculate and obtain accurate upgoing wave travel time and VSP upgoing wave travel time according to the seismic forward modeling model;

[0095] Step 3: Using the precise up-going wave travel time t acc and VSP upgoing wave travel time t VSP Obtain the travel time error of the up-going wave;

[0096] Step 4: Pick up the first arrival to obtain the travel time error of the first arrival;

[0097] Step 5: Obtain the precise round-trip travel time of VSP according to the up-going wave travel time error obtained in the third step and the first arrival travel time error obtained in the fourth step.

[0098] Step 6: Use the VSP to obtain the correct time-depth r...

Embodiment 3

[0132] Select the Marmousi model, the schematic diagram is as follows diagram 2-1 with Figure 2-2 as shown, diagram 2-1 is the leveling model established according to the model data (black vertical lines) at the well position, Figure 2-2 is the actual slope model.

[0133] use diagram 2-1 with Figure 2-2 The two models in the model respectively do VSP seismic wave forward modeling, and the obtained forward modeling records are as follows: Figure 3-1 with Figure 3-2 as shown, Figure 3-1 is the VSP seismic forward modeling record of the leveling model, Figure 3-2 It is the VSP earthquake forward modeling record of the actual model. According to the inclination angle of the interface, the time error of the upgoing wave is obtained through step three, and the two-way travel time is obtained by using the principle of first arrival pick-up by the energy ratio method in step four. In actual use, the VSP data is used as the basis for horizon calibration. When the mo...

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Abstract

The invention provides a VSP accurate horizon calibration method and system based on a ray theory, and belongs to the field of seismic data processing and interpretation in oil-gas exploration and development. According to the method, an earthquake forward modeling model is established through an earthquake data observation system and logging data, VSP upgoing wave travel time errors and first arrival travel time errors are obtained through the earthquake forward modeling model and first arrival travel time pickup, then VSP accurate two-way travel time is obtained through VSP upgoing wave travel time error correction and first arrival travel time correction, the time-depth relation is determined, and the time-depth relation is calculated. And thus, accurate horizon calibration of the VSP is realized. The method is more in line with the actual condition of the underground stratum, lays a foundation for accurate horizon calibration, can accurately calculate the VSP upgoing wave travel time error based on the ray theory, is high in calculation efficiency, can obtain accurate VSP two-way travel time through travel time correction in combination with first arrival travel time pickup, determines a correct time-depth relationship, and improves the accuracy of VSP upgoing wave travel time. And accurate stratum position calibration is carried out to obtain accurate interval velocity.

Description

technical field [0001] The invention belongs to the field of seismic data processing and interpretation in oil and gas exploration and development, and in particular relates to a method and system for VSP precise horizon calibration based on ray theory. Background technique [0002] On the basis of investigating a large number of detectable documents and patents at home and abroad, and fully understanding and studying the software products of research institutions and geophysical companies, the prior art situation related to the present invention is summarized as follows: [0003] Conventional VSP time-depth calibration technology does not fully consider the VSP time-depth relationship, and ignores the difference between VSP time and imaging processing time. This method has little impact on the interpretation of simple horizontal formations, but is not suitable for complex structures. Conventional VSP assumes a horizontal layered medium model, but when faced with non-horizon...

Claims

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Application Information

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IPC IPC(8): G01V1/30G01V1/40
CPCG01V1/306G01V1/40G01V2210/624
Inventor 杜泽源蔡杰雄陶永慧
Owner CHINA PETROLEUM & CHEM CORP
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