While-drilling transverse wave calculation method and system
A calculation method and technology of a calculation system, applied in geophysical measurement, instruments, etc.
Active Publication Date: 2020-04-21
CHINA PETROLEUM & CHEM CORP +1
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[0002]The traditional geosteering technology based on measurement while drilling and logging while drilling can obtain real-time logging measurement data during drilling, including: resistivity curve, Acoustic time difference, etc., but in the process of pre-stack seismic inversion while drilling, shear wave data is needed, and shear wave is not obtained through real-time logging measurement during drilling, so it needs to be solved by rock physics model Obtained, currently there is no related shear wave prediction technology in the process of logging while drilling
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[0031] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
[0032] figure 1 A flow chart showing the steps of the method for calculating the shear wave while drilling according to the present invention.
[0033] In this embodiment, the shear wave calculation method while drilling according to the present invention may include: step 101, according to the real-time logging while drilling and logging data, obtain the resistivity curve and the longitudinal wave acoustic time difference; step 102, judge the rock according to the resistivity curve ...
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The invention discloses a while-drilling transverse wave calculation method and system. The method comprises the following steps: acquiring a resistivity curve and longitudinal wave interval transit time according to a real-time logging while drilling and logging data; determining the rock lithology according to the resistivity curve, and acquiring interval data delta mi of different lithologies;acquiring a longitudinal wave speed corresponding to the interval data according to the longitudinal wave interval transit time of the interval data; selecting a conversion formula according to the lithology of the interval data; calculating a transverse wave speed corresponding to the interval data according to the longitudinal wave speed corresponding to the interval data and the conversion formula; and calculating the final transverse wave speed according to the transverse wave speeds corresponding to all the interval data. The interval transit time obtained through real-time measurement isconverted into real-time transverse wave data, different empirical formulas are adopted to convert the interval transit time data into the transverse wave data in real time along with drilling of different rock stratums, real-time accuracy is achieved, so that a data basis is provided for while-drilling pre-stack earthquake inversion.
Description
technical field [0001] The invention relates to the field of geophysical exploration in the petrochemical industry, and more specifically, to a calculation method and system for shear waves while drilling. Background technique [0002] The traditional geosteering technology based on measurement-while-drilling and logging-while-drilling can obtain real-time logging measurement data during the drilling process, including: resistivity curves, acoustic time differences, etc., but in the pre-stack seismic inversion process while drilling In the process of drilling, the shear wave data is needed, and the shear wave will not be obtained through real-time logging measurement during the drilling process, so it needs to be obtained through the solution of the petrophysical model. At present, there is no relevant shear wave in the logging while drilling process. predictive technology. Therefore, it is necessary to develop a calculation method and system for shear waves while drilling....
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IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 周单
Owner CHINA PETROLEUM & CHEM CORP