Acoustic logging curve correction method based on VSP data
A technology of well logging curves and correction methods, which is applied in seismic signal processing and other directions, and can solve problems such as distortion of sonic logging curves
Active Publication Date: 2014-06-04
BC P INC CHINA NAT PETROLEUM CORP +1
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[0005] The purpose of the present invention is to use the accurate time-depth relationship of VSP data to correct the acoustic logging curve, effectively solve the distortion problem of the acoustic logging curve, and make the corrected acoustic wave synthesis record finely and accurately calibrate the seismic geological horizon
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[0012] Embodiments of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
[0013] In order to solve the problems of distortion of acoustic logging curves, poor matching between acoustic synthetic records and surface seismic records, and inability to accurately calibrate seismic geological horizons, the present invention proposes a method for correcting acoustic logging curves based on VSP data. The obtained correction The resulting acoustic logging curve can better reflect the formation velocity characteristics, and the acoustic synthetic record is more compatible with the surface seismic section wave group characteristics, which improves the quality of the acoustic synthetic record.
[0014] figure 1 is a flowchart illustrating a method for correct...
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The invention provides an acoustic logging curve correction method based on VSP data. The method comprises the steps that acoustic logging curves are corrected to the same base level according to the first arrival time depth relation marked by the VSP data; the time depth relation of the acoustic logging curves is corrected through the VSP data on each layer of an objective interval, and the time differences of the time depth relation points of the VSP data and the time depth relation points of the acoustic logging curves are calculated; the average value of the time differences of the time depth relation points on each layer of the acoustic logging curves and the VSP data is calculated; the acoustic logging curves are overall stretched by the average value of the time differences; an acoustic velocity value is adjusted, and when average layer velocity of the acoustic logging curves and the average layer velocity of the VSP data are consistent, the corrected acoustic logging curves are obtained. The accurate time-depth relation of the VSP data is utilized, logging layering and area geologic features are combined, the acoustic logging curves are corrected, and a corrected acoustic synthetic record and ground seismic section wave set features are matched better.
Description
technical field [0001] The invention belongs to the field of petroleum and natural gas seismic exploration investigation, and is mainly applied to indoor seismic data processing and interpretation of petroleum seismic exploration, more specifically, relates to a method for correcting acoustic logging curves based on VSP data. Background technique [0002] The application of seismic exploration technology has developed from the study of geological structure to the study of stratum lithology. With the development of technology for finding subtle and complex reservoirs, the accuracy of lithology interpretation is required to be higher and higher. At this time, fine calibration of seismic geological horizons is particularly important. [0003] At present, geophysical engineers often use acoustic logging data to calibrate seismic geological horizons, and acoustic logging data are affected by many factors such as formation lithology, wellbore, mud infiltration into the formation, ...
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IPC IPC(8): G01V1/36
Inventor 秦俐李亚林曹立斌罗坤唐建马路李豪
Owner BC P INC CHINA NAT PETROLEUM CORP