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A Search Method for Seismic Direct Arrival Wave Groups While Drilling

A search method and direct wave technology, applied in seismic signal processing, seismology for logging records, etc., can solve the problems of unstable transformation of energy and frequency, low signal-to-noise ratio, strong noise energy, etc., to improve The effect of profile resolution, fast search speed and high accuracy

Active Publication Date: 2016-08-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Moreover, the seismograph while drilling is close to the drilling site, the surrounding terrain is changeable, the environment is complex, and the long-term, open-air, and unwarranted recording conditions result in many types of noise in the seismograph while drilling, with strong noise energy and very weak effective direct Waves and reflected waves are basically drowned in various types of noise, and the signal-to-noise ratio is extremely low
In addition, the vibration signal of the drill bit is a continuous non-pulse random signal, with a large amount of data, and the transformation of energy and frequency is extremely unstable. It is impossible to determine the occurrence time, nature and source of the effective wave from the massive data

Method used

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  • A Search Method for Seismic Direct Arrival Wave Groups While Drilling
  • A Search Method for Seismic Direct Arrival Wave Groups While Drilling
  • A Search Method for Seismic Direct Arrival Wave Groups While Drilling

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Embodiment Construction

[0042] The data used in the embodiment of the present invention is part of the data extracted from the seismic records while drilling actually observed in the field.

[0043] According to the design plan, a seismometer while drilling is placed on the surface to receive the vibration signal of the drill bit transmitted through the formation, and this signal is the original record of the seismic acquisition while drilling ( image 3 ).

[0044] Firstly, the surface seismic result section of the well was obtained ( figure 1 ), find out the main reflection layer R below the specified depth i , from which the reflection coefficient ζ(t) of each layer is extracted, and cross-correlated with the bell-shaped cosine function C(t), the ground seismic reflection wave sequence "template" H(τ)( figure 2 ), whose amplitude corresponds to the intensity of the reflected wave. Then the original seismic records while drilling are subjected to various filtering processes such as suppressing ...

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Abstract

The invention belongs to the field of processing seismic data while drilling in the field of seismic exploration, and in particular relates to a search method for direct wave groups of seismic while drilling based on ground seismic sections. The present invention uses the reflection information provided by the ground seismic profile and the bell-shaped cosine function to obtain the ground seismic reflection wave "template", and then uses the energy and phase degree of the seismic wave while drilling to calculate the existence probability of the direct wave, and then combines the ground seismic reflection wave template with the direct wave There is probability cross-correlation, and the seismic direct wave sequence while drilling is finally determined according to the change of cross-correlation magnitude.

Description

technical field [0001] The invention belongs to the technical field of processing seismic data while drilling in the field of seismic exploration, and in particular relates to a seismic direct wave group search method while drilling based on a ground seismic profile. technical background [0002] Seismic-while-drilling technology is a new in-hole seismic technology that combines seismic exploration technology and petroleum drilling engineering technology. It has the characteristics of not interfering with drilling construction, continuous measurement in the depth direction, and high exploration efficiency. It is a high-tech technology with strategic significance. technology. [0003] The "vibration source" used in seismic while drilling is the vibration generated by the drill bit hitting the formation rock during the drilling process. Compared with the ground environmental noise, the energy of this signal is very weak. Moreover, the seismograph while drilling is close to th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/40
Inventor 韩来聚耿迎春于丽丽曹忠成王爱凤李玉红解莉萍范寅聪
Owner CHINA PETROLEUM & CHEM CORP
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