Method for forward modeling multi-pole acoustic wave dispersion curve while drilling of alteration formation
A technology of dispersion curve and forward modeling, which is applied in the field of exploration while drilling, can solve the problem of huge amount of calculation and achieve the effect of improving the calculation speed
Inactive Publication Date: 2018-12-18
YANGTZE UNIVERSITY
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[0004] The embodiment of the present invention provides a forward modeling method for simulating multipole acoustic wave dispersion curves while drilling in altered formations, so as to solve the problem that the existing simulated alteration model cannot be continuously altered outside the well or the amount of calculation is too large when simulating question
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[0024] The embodiment of the present invention provides a method for forward modeling of multipole acoustic wave dispersion curve while drilling in altered formation, which is used for forward modeling of dispersion curve while drilling, improves the actual calculation speed of the existing forward modeling method, and ensures measurement stability and accuracy.
[0025] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope o...
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The invention discloses a method for forward modeling multi-pole acoustic wave dispersion curve while drilling of alteration formation which I used for forward modeling of the dispersion curve of acoustic waves while drilling. The method comprises following steps: obtaining a preset angular frequency and a corresponding phase velocity in a reference state; calculating the disturbance function of formation elastic parameters according to the formula; obtaining change of angular frequency after disturbance by perturbation integral function; calculating the phase velocity change of multi-pole dispersion curve while drilling after the formation elastic parameter disturbance; then obtaining the phase velocity of the dispersion curve of the altered strata; calculating phase velocity corresponding to each angular frequency in a frequency interval and obtaining a dispersion curve of multi-pole acoustic logging while drilling in an altered formation in the frequency interval by forward modeling. In the invention, the influence of the disturbance of the formation parameters is calculated by the perturbation integral, the shortcoming that the existing forward dispersion curve cannot simulatethe continuous alteration outside the well is overcome, and the calculation speed of the dispersion curve of the continuous alteration model is greatly improved.
Description
technical field [0001] The invention relates to the field of exploration while drilling, in particular to a method for forward modeling and simulating multipole acoustic wave dispersion curve while drilling an altered formation. Background technique [0002] In the process of oil and natural gas drilling, while-drilling technology has been widely used. Acoustic logging while drilling can determine the physical information in the formation and provide guidance for the development and exploration of oil and gas fields. For altered formations, obtaining the dispersion curve of multipole acoustic logging while drilling for forward modeling can provide theoretical support for mud invasion, tomographic imaging and other research, and can obtain a reliable forward modeling model. [0003] At present, there are two methods for forward modeling of multipole acoustic logging dispersion curves while drilling in altered formations: one is to use the Thomson-Hasker propagation matrix fo...
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IPC IPC(8): E21B47/18E21B49/00
CPCE21B47/18E21B49/00
Inventor 黑创苏远大庄春喜唐晓明李修权罗明璋付青青吴爱平
Owner YANGTZE UNIVERSITY