Method and device for determining layer velocity at seismic scale

A layer velocity and scale technology, applied in the field of layer velocity determination, can solve problems such as low velocity, affecting seismic interpretation accuracy, affecting time-depth conversion accuracy, etc.

A layer velocity and scale technology, applied in the field of layer velocity determination, can solve problems such as low velocity, affecting seismic interpretation accuracy, affecting time-depth conversion accuracy, etc.

CN107065013BActive Publication Date: 2019-01-25CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Method and device for determining layer velocity at seismic scale
  • Method and device for determining layer velocity at seismic scale
  • Method and device for determining layer velocity at seismic scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0144] In order to describe the features and working principle of the present invention more intuitively, a practical application scenario will be described below.

[0145] Such as Figure 7 As shown, it is a flow chart of this embodiment based on the finely synthesized seismic records of this case. include:

[0146] Step 1): Preprocessing of the acoustic logging signal to obtain the layer velocity under the logging frequency band;

[0147] Such as Figure 8Shown is the comparison chart of the data before and after the acoustic logging signal preprocessing. In the graph, data before preprocessing constitutes a solid line, and data after preprocessing constitutes a dotted line. The purpose of preprocessing is to correct the environment of acoustic logging curves, such as mud erosion correction and borehole diameter correction, etc., and to suppress or weaken the interference in the form of noise in the acquisition signal. The variable time window filter is used to preproce...

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Abstract

The present invention relates to a method and device for determining the layer velocity at the seismic scale. The method includes: obtaining the layer velocity under the logging frequency band; determining the rock physical statistical relationship according to the layer velocity under the logging frequency band and the corresponding known quality factor Correlation coefficient; establish the first objective function according to the layer velocity in the logging frequency band and the correlation coefficient in the petrophysical statistical relationship, and obtain the layer velocity at the seismic scale satisfying the velocity-dispersion relationship according to the first objective function; determine the current position The length of the scale coarsening window, using the length of the scale coarsening window at the current position to obtain the number of sample points in the scale coarsening window at the current position; and determining the current position according to the layer velocity at the seismic scale satisfying the velocity-dispersion relationship and the corresponding number of sample points The layer velocity after the coarsening of the seismic scale at the current position is corrected to obtain the layer velocity at the seismic scale that accurately reflects the travel time information of seismic wave propagation.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, in particular to a method and device for determining layer velocity under the seismic scale that can accurately reflect travel time information of seismic wave propagation. Background technique [0002] With the continuous deepening of oil and gas exploration and development, how to make full use of the high-resolution characteristics of well logging data in the vertical direction and the control ability of 3D seismic data in the lateral direction, and improve reservoir prediction and oil and gas identification under the constraints of limited logging data Reliability is an inevitable trend in the development of oil and gas seismic exploration technology. Well seismic calibration is a bridge for accurate cross-scale calibration of logging data and seismic data. Through the production of fine synthetic seismic records, the quantitative mapping between the elastic paramete...

Claims

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Application Information

Patent Timeline
25 Jan 2019
Publication
CN107065013B
IPC
G01V1/40; G01V1/30; G01V1/36
CPC
G01V1/303; G01V1/362; G01V1/40; G01V2210/52; G01V2210/6222
Inventors
曹丹平