Near-surface modeling method using tomography inversion of two-step method

A technology of tomographic inversion and modeling method, which is applied in the field of two-step tomographic inversion near-surface modeling to achieve the effects of ensuring reliability, improving imaging quality, and eliminating human errors

Inactive Publication Date: 2012-07-18
中国石油集团西北地质研究所有限公司
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Problems solved by technology

The method provided by the invention combines the advantages of different methods, improves the accuracy of near-surface modeling and the rationality of the obtained static correction, and solves the problem of fine near-sur

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  • Near-surface modeling method using tomography inversion of two-step method
  • Near-surface modeling method using tomography inversion of two-step method
  • Near-surface modeling method using tomography inversion of two-step method

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Embodiment 1

[0035] The two-step tomographic inversion near-surface modeling method is used for actual data processing and application in the L6 work area in the hinterland of the Junggar Basin. The work area is composed of three contiguous blocks constructed in different years. Covered by steep slopes and semi-fixed deserts, the dunes are nearly north-south, and there are honeycomb sand dunes in some parts, with a maximum height difference of 50 meters. The ground altitude is between 593.7 meters and 369.6 meters, and the height difference reaches 224 meters. Between 50 meters and 200 meters; most of the original single shots are distorted at the first arrival, and the static correction problem is very serious. The traditional static correction method does not work well in this area.

[0036] We used the two-step tomographic inversion near-surface modeling method in this work area to carry out near-surface modeling and static correction calculation applications. The implementation steps of...

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Abstract

The invention relates to a near-surface modeling method using tomography inversion of a two-step method. The near-surface modeling method specifically comprises the following steps of: (1) picking and inputting short-refraction first-break; (2) carrying out tomography inversion on the short-refraction first-break and outputting explanation results capable of reflecting fine velocity change in an extremely shallow stratum as shown in picture 2; (3) picking a big shot and recording first-break time; (4) interpolating short-refraction inversion results in combination with explanation results of a microlog in a work area by using a kriging method and building near-surface velocity body of the extremely shadow stratum; (5) meshing and constraining inversion initial-velocity modeling, replacing a near-surface velocity body at the extremely shallow stratum obtained in the last step into the shallow stratum part of the initial model generated at the big-shot first-break, replenishing the velocity loss of the extremely shallow stratum resulting from the excessive minimum offset distance of the big shot; (6) constraining generation of a weight field; and (7) inversing the near-surface velocity model by using a constrained chromatography method, picking the top interface of a high-speed layer on the basis of a velocity-depth model obtained by tomography inversion, and calculating static correcting values of a shot point and a geophone position.

Description

technical field [0001] The invention belongs to the technical field of seismic data processing and interpretation in petroleum seismic exploration, and specifically relates to a two-step tomographic inversion near-surface modeling method for obtaining surface velocity by a two-step tomographic inversion near-method. Background technique [0002] In the field of petroleum seismic exploration, the existence of the near-surface low-velocity zone causes the problem of static correction, which leads to the inability of the seismic profile to accurately reflect the shape of the underground geological structure. Therefore, it is necessary to eliminate the low-velocity zone during seismic data processing. Statics problem. [0003] In order to solve the problem of static correction, it is necessary to obtain the near-surface depth-velocity model, which is mainly obtained by two methods, one is obtained by the small refraction method of field investigation, and the other is obtained b...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 王宇超冯心远李斐赵玉合
Owner 中国石油集团西北地质研究所有限公司
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