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A Method of Determining the Optimal Airgun Array

An air gun and array technology, which is applied in the field of seismic exploration and marine geological survey, can solve the problems that the subjective factors of the evaluation criteria are greatly affected, the degree of wavelet contribution cannot be comprehensively considered, and the quality of the air gun array cannot be quantitatively evaluated, so as to improve the acquisition Quality, work efficiency improvement effect

Active Publication Date: 2017-03-15
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] However, using this method to evaluate the quality of the air gun array has its objective limitations, and the design scheme of the air gun array cannot be evaluated according to the geological characteristics of the exploration target layer. The evaluation standard is greatly affected by the subjective factors of the designer and cannot be quantified. To evaluate the pros and cons of the airgun array accurately, and at the same time, the contribution of these parameters to the pros and cons of the wavelet cannot be considered comprehensively

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  • A Method of Determining the Optimal Airgun Array

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[0021] The present invention and application effect thereof are further illustrated below by concretely:

[0022] 1) First, four air gun arrays were designed according to field construction requirements and equipment conditions, and their numbers were ZL1, ZL2, ZL3, and ZL4. For ZL1, air gun array capacity V=2430in 3 , sinking depth h=3.5m; for ZL2, air gun array capacity V=2570in 3 , sinking depth h=3.0m; for ZL3, air gun array capacity V=1576in 3 , sinking depth h=2.5m; for ZL4, air gun array capacity V=3000in 3 , the sinking depth h=5.0m; the above four air gun arrays adopt the same working pressure P=2000psi;

[0023] 2) For the above four air gun arrays, simulate their far-field wavelets respectively, such as figure 1 The results of the far-field wavelets of the four airgun arrays are displayed on the same screen, and the parameter values ​​of the four wavelets are calculated: the main pulse value of the wavelet Peak, the peak-to-peak value P_P, the bubble ratio PBR, ...

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Abstract

The invention provides a method for confirming an optimal air gun array in an exploration and a marine geological survey. 3-4 different air gun arrays are designed according to the known construction requirements and device conditions. Far-field sub-waves of the different air gun arrays are simulated respectively by aiming at the different air gun arrays, and parameters of the far-field sub-waves of all the air gun arrays are calculated. Weight coefficient values of the parameters of the far-field sub-waves of all the air gun arrays are confirmed according to the exploration requirements, and then weighted and summed up and compared so that the air gun array with the maximum weighted and summed up value is the optimal air gun array. Selection of the optimal air gun array is realized, and quantitative preference selection of different air gun array design schemes is realized so that working efficiency in offshore exploration air gun array design and optimization is enhanced and technical support is provided for enhancement of seismic exploration acquisition quality.

Description

technical field [0001] The invention relates to the technical fields of seismic exploration and marine geological survey, in particular to a method for determining an optimal air gun array. Background technique [0002] Marine seismic exploration uses air guns as the main excitation source. Usually, in order to increase the energy of the air gun source to achieve the purpose of improving the penetration of deep formations, multiple air guns are combined and arrayed according to different spatial layouts during operation. The common air gun combination form There are: tuned airgun sources; coherent airgun arrays; and tuned-coherent hybrid airgun arrays. The characteristic of different forms of combined array excitation is that the seismic wavelets produced by different forms of combined excitation of seismic sources are very different. [0003] How to objectively evaluate the quality of the airgun wavelet is an important content to determine the quality of the airgun array f...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/133G01V1/137G01V13/00
Inventor 倪成洲陈浩林刘军牛宏轩曹明强张洪军李晓东
Owner BC P INC CHINA NAT PETROLEUM CORP
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