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Three-dimensional three-component submarine cable seismic data speed modeling method

A submarine cable and seismic data technology, applied in seismology, seismic signal processing, measuring devices, etc., can solve the problems of large gather errors, multi-person computer interaction, and affecting the accuracy of velocity models, so as to reduce the impact and improve processing efficiency , The effect of saving labor costs

Active Publication Date: 2016-12-07
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires more human-computer interaction, and the error of the gathers obtained through the reaction correction is relatively large, which ultimately affects the accuracy of the velocity model

Method used

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  • Three-dimensional three-component submarine cable seismic data speed modeling method
  • Three-dimensional three-component submarine cable seismic data speed modeling method
  • Three-dimensional three-component submarine cable seismic data speed modeling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Such as image 3Shown is the Marmousi-II (Mamosi II) compressional wave velocity model, which has a complex structure, complex lithology, and is filled with various fluids. It is an international classic model for verifying velocity modeling and migration imaging algorithms. Use the method of the present invention to carry out migration velocity scanning to the Marmousi-II longitudinal wave simulation data, form the longitudinal wave velocity spectrum, wherein the corresponding velocity spectrum at the black line place in the model is as Figure 4 shown. Based on the P-wave velocity spectrum, the velocity-time pair is picked up and interpolated to form the Marmousi-II P-wave velocity model, as shown in Figure 5 shown. Such as Figure 6 As shown in (a) and (b), the true velocity model and the Marmousi-II P-wave velocity model are used for migration imaging respectively, where Figure 6 (a) is the migration imaging result of the true velocity model, Figure 6 (b) is...

Embodiment 2

[0089] Such as Figure 7 As shown, it is a simple layered model artificially constructed. The shallow part of the model is four horizontal reflection coefficient surfaces, and the deep layer is a concave reflection coefficient surface. The longitudinal wave velocity in the entire model range is 5000m / s, and the shear wave velocity is 2500m / s. s. Based on this, a set of P-wave data and a set of converted-wave data were respectively simulated through specific methods.

[0090] Such as Figure 8 (a), (b), and (c), from left to right are the P-wave velocity spectrum, S-wave velocity spectrum, and P-to-shear velocity ratio spectrum formed by using the pre-stack time migration velocity scan of the present invention. By picking up the velocity, the P-wave and S-wave velocity models and the P-to-S wave velocity ratio model are formed. Such as Figure 9 As shown in (a) and (b), the real velocity model and the model established by the method of the present invention are used for mig...

Embodiment 3

[0092] As shown in Fig. 10 (a), (b) and (c), the P-wave velocity, S-wave velocity and P-to-shear velocity ratio model are established for a certain offshore three-dimensional three-component OBC data using the method of the present invention respectively. Using the established model to perform pre-stack time migration imaging on OBC data, the results are as follows Figure 11 As shown in (b); at the same time, a well-known international commercial software is used to carry out velocity modeling and migration imaging on the same data, and the obtained results are as follows Figure 11 (a) shown. It can be seen that the event of imaging using the method of the present invention is clear and the fault is clear, which illustrates the effectiveness and practicability of the present invention to actual OBC converted wave data; it can be found by comparison that the results of the present invention are slightly better than those of commercial software, mainly Reflected in the middle...

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Abstract

The invention relates to a three-dimensional three-component submarine cable seismic data speed modeling method. The method comprises the following steps that earlier stage processing is carried out on a longitudinal wave seismic trace set and a converted wave seismic trace set of submarine cable seismic data; longitudinal wave pre-stack time migration speed scanning is carried out, and a longitudinal wave speed model is established; transverse wave pre-stack time migration speed scanning is carried out, and a transverse wave speed model is established; a longitudinal wave and transverse wave speed ratio model is established and optimized; converted wave pre-stack time migration imaging is carried out on selected speed modeling control lines, and a control line imaging trace set is obtained; percentage scanning migration is carried out on an optimization longitudinal wave and transverse wave speed ratio field; optimal percentage coefficients are selected from the control line imaging trace set based on three criteria, and a final optimization coefficient body is formed; the optimization longitudinal wave and transverse wave speed ratio field multiplies the final optimization coefficient body, and a final longitudinal wave and transverse wave speed ratio model is obtained; pre-stack time migration imaging is carried out on converted waves of a whole exploration work area through the longitudinal wave speed model, the transverse wave speed model and the final longitudinal wave and transverse wave speed ratio model.

Description

technical field [0001] The invention relates to a three-dimensional three-component seismic data velocity modeling method based on pre-stack time migration, in particular to a three-dimensional three-component submarine cable seismic data velocity modeling method based on a double square root travel time equation. Background technique [0002] Seismic exploration is the most important means for human beings to obtain information such as underground structures, and plays a pivotal role in the field of oil and gas exploration. In the past 100 years of oil and gas exploration, compressional wave exploration has played an irreplaceable role. However, with the deepening of exploration, the shortcomings of traditional compressional wave exploration began to appear, such as insufficient sensitivity of compressional waves to fracture development zones, Difficulty in imaging gas-bearing zone structures, etc. In this context, multi-wave and multi-component exploration is gradually em...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/282G01V2210/512
Inventor 黄小刚薛东川张云鹏江南森李维新杨俊王艳冬桑淑云刘永江王小六
Owner CHINA NAT OFFSHORE OIL CORP
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