A method of periodically measuring the time thickness of a sedimentary strata using a receiver function

A time-thickness and periodic technology, applied in the field of solid geophysics research, can solve the problems of expensive drilling method, inability to guarantee base reflection, high cost, etc.

Inactive Publication Date: 2017-05-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the drilling method is not only expensive, but also can only provide a little stratum information; the gravity prospecting method and the magnetotelluric sounding method adopt the method of downward extension of the potential field, and its accuracy is affected by the exploration depth
In addition, the artificial seismic method in oil and gas exploration can also be used to study sedimentary strata, which can obtain subsurface images, but it also requires high costs and cannot guarantee basement reflections

Method used

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  • A method of periodically measuring the time thickness of a sedimentary strata using a receiver function
  • A method of periodically measuring the time thickness of a sedimentary strata using a receiver function
  • A method of periodically measuring the time thickness of a sedimentary strata using a receiver function

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Embodiment 1

[0040] The method of the present invention was used in the Williston Basin of North America. The basin is rich in oil and gas resources and is a typical Karatonic basin. The area of ​​the basin is in the range of latitude 41° to 50° and longitude -111° to -95°. Select all seismic stations in this area, a total of 307. From the data processing center of IRIS (Incorporated Research Institutions for Seismology), the data of 2459 teleseismic earthquakes of magnitude 4 or above at these stations since 1980 were obtained. After basic processing of these data, the receiver function was obtained, and the total is 2459&*307 = 754913 pieces. In the processing, the time when the converted wave generated by the seismic wave on the Moho arrives at the station is set as time 0, and the receiving function that can be used in the research of the present invention is selected according to whether there is an obvious converted wave at time 0. figure 2 and Figure 4 What is shown is the sel...

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Abstract

The invention discloses a method of periodically measuring the time thickness of a sedimentary strata using a receiver function, and belongs to the field of solid geophysical research. In the invention, the vertical component Z, the radial component r and the tangential component t of the three component seismic data whose magnitude is more than four or more and the epicentral distance is 30 DEG to 100 DEG is selected by a seismic station, and seismic events satisfying the condition are selected; and then the normalized autocorrelation functions (shown in the description) of the vertical component Z, the radial component r and the tangential component t for each seismic event are separately calculated; whether each seismic event has periodicity is detected and whether the periodicity of the earthquake event i is the periodicity caused by the sedimentary strata below a receiving station is determined; and the mathematical average algorithm is used to obtain the average time thickness which reflects the thickness of the sedimentary strata below the seismic station. The method of the invention provides a theoretical basis for the research of the sedimentary strata.

Description

technical field [0001] The invention relates to the field of solid geophysics research, which is used for earth structure research and sedimentary basin basement depth measurement, in particular to a method for measuring the time thickness of sedimentary formations. Background technique [0002] The time thickness of sedimentary strata refers to the time for seismic waves to propagate vertically downward from the surface to the bottom interface of the sedimentary layer and then propagate upwards back to the surface. This time can be used to describe the relative thickness of the sedimentary strata and the buried depth of the basin basement. [0003] According to the theory of plate tectonics, the earth is composed of the crust, mantle and core. The nature and thickness of the crust are closely related to geological disasters such as natural earthquakes, and the sedimentary basins on it are closely related to the enrichment of mineral resources. Whether it is in the study of...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/305G01V2210/6222
Inventor 宋建国高尚行
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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