Calculating method of seismic wavelet frequencies
A technology for seismic wavelet and frequency calculation, which can be used in calculations, special data processing applications, instruments, etc.
Active Publication Date: 2015-07-29
CHINA PETROLEUM & CHEM CORP +1
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This method can quantitatively calculate the main frequency information of the seismic wavelet, but in the actual field acquisition process, a considerable part of the energy will be used to break the rock after the explosive is excited, so the preconditions of this method are difficult to be satisfied, which makes There is also a large deviation in the calculated seismic wavelet frequency
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[0046] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0047] In addition, the steps shown in the flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although a logical order is shown in the flow diagrams, in some cases, the sequence may be different. The steps shown or described are performed in the order herein.
[0048] Aiming at the problems existing in the current wavelet frequency calc...
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The invention discloses a calculating method of seismic wavelet frequencies. The method comprises the steps of acquiring physical parameters of an earthquake origin and a propagation medium; calculating geometrical parameters of a breaking area generated by the earthquake origin; calculating the seismic wavelet frequencies based on the velocity of longitudinal wave in the geometrical parameters of the breaking area and the physical parameters of the propagation medium according to a cavity exploding model. According to the calculating method provided by the invention, the seismic wavelet frequencies can be quickly and accurately calculated; meanwhile, the breaking lasting time information and elastic wave energy conversion rate information of the propagation medium can be obtained; in addition, the calculating method has a guide effect of selecting the earthquake origin and selecting the lithology of the propagation medium in a wild seismic exploration construction process, therefore being beneficial for the work deployment of a user before the seismic exploration and acquisition.
Description
technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a method for calculating the frequency of seismic wavelets. Background technique [0002] Seismic exploration is an important technology to use the source to excite seismic waves and analyze the recorded seismic waves to detect underground oil and gas resources. Among them, the seismic source directly determines the energy, frequency and other characteristics of the seismic wavelet, and also plays a vital role in the subsequent exploration and production. Explosives are a commonly used source in seismic exploration. However, due to the complexity of the explosion excitation process, there are few studies on the effect of explosives source on seismic wavelets. In the actual seismic acquisition process, more work is carried out based on empirical guidance. [0003] The existing seismic wavelet frequency calculation method cannot calculate the seismic wavelet frequency...
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Inventor 魏修成刘韬季玉新陈天胜刘春园刘炯
Owner CHINA PETROLEUM & CHEM CORP