First-motion wave traveling time picking-up method and device

A travel time and computing device technology, applied in seismic signal processing and other directions, can solve the problems of large first-arrival waveform changes, large terrain fluctuations, and inapplicability, and achieve the effect of space jumping, obvious take-off time, and accurate picking

Active Publication Date: 2014-03-05
PETROCHINA CO LTD
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Problems solved by technology

[0007] However, in complex surface areas such as mountains, gravel areas, and loess tablelands, due to large terrain fluctuations and drastic changes in near-surface velocity, the waveform of the first arrival wave changes greatly, and the interference wave becomes complicated.
In complex surface areas, the signal-to-noise ratio of seismic data is low. At the same time, due to the large fluctuation of terrain, the

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  • First-motion wave traveling time picking-up method and device
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  • First-motion wave traveling time picking-up method and device

Examples

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Example Embodiment

[0063] Example 1 is a method of picking up first arrivals during travel, which is suitable for complex surface areas provided by the present invention. figure 1 It is a flow chart of the method for picking up first arrivals during travel provided by the present invention. Such as figure 1 As shown, a method for picking up first arrivals while traveling, its implementation includes the following processing steps:

[0064] S1: The computing device processes the collected seismic data into a total shot collection seismic data record.

[0065] When collecting seismic data in the field, one or more seismic waves can be excited at one shot point, or one or more seismic waves can be excited at multiple shot points, and then geophones collect and record data. The point where the source of the seismic wave is excited is called the shot point. Usually, the collected seismic data is preprocessed. The pre-processing generally includes: removing waste artillery passages, eliminating industria...

Example Embodiment

[0111] Embodiment 2 is a first arrival pick-up device provided by the present invention, Figure 8 It is a schematic diagram of the module structure of the first-arrival pick-up device provided in the second embodiment of the present invention. Such as Figure 8 As shown, the first-arrival travel time picking device includes a preprocessing module 1, an initial reference line definition module 2, a feature function calculation module 3, a first-arrival travel time extraction module 4, and an equalization processing module 5, in which:

[0112] The preprocessing module 1 can be used to process the collected seismic data into a common shot set seismic data record. The preprocessing module can also be used to eliminate waste artillery channels and eliminate industrial single-frequency interference from the collected seismic data;

[0113] The initial reference line definition module 2 can be used to define initial reference lines in the seismic data records of the common shot set, and...

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Abstract

The invention provides a first-motion wave traveling time picking-up method and device. The first-motion wave traveling picking-up method comprises the steps that a calculating device processes collected earthquake data into common-source set earthquake data records; the calculation device defines an initial reference line in a partition mode in the common-source set earthquake data records, and selects a processing time window w for the initial reference line; the calculation device calculates the characteristic function value of all the sampling points in the processing time window with a sampling point on the initial reference line as a central point of earthquake channels in the common-source set earthquake data records; the calculation device extracts first-motion wave traveling time in the processing time window of the earthquake channels on the initial reference line according to the calculated characteristic function value; the calculation device processes the extracted first-motion wave traveling time in a balancing mode. The first-motion wave traveling time picking-up method and device are especially suitable for picking up the first-motion wave traveling time in areas, with complex ground surfaces, such as mountainous area, gravel areas and loess tablelands.

Description

technical field [0001] The invention relates to the field of seismic data processing in oil and gas exploration, in particular to a first-arrival travel time picking method and device. Background technique [0002] Before drilling and developing underground oil and natural gas, it is necessary to survey the strata, and seismic exploration is an important means of surveying oil and natural gas resources before drilling. In seismic exploration, the difference in elasticity and density of underground media is generally used to infer the shape of underground structures and the properties of rock formations by observing and analyzing the response of the earth to artificially excited seismic waves. Seismic exploration usually includes refracted wave seismic exploration and reflected wave seismic exploration. Currently, in the field of oil and gas resource exploration, reflected wave seismic exploration is mainly used. [0003] The reflection wave seismic exploration process consi...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 徐基祥
Owner PETROCHINA CO LTD
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