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Wave impedance inversion method for deposition cycle restriction

A technology of wave impedance inversion and sedimentary cycle, which is applied in the fields of seismology and seismic signal processing for well logging records, and can solve problems such as unsatisfactory reservoir prediction, inability to constrain seismic data, and poor targetness of results, etc. Achieve fast speed, good reservoir distribution and strong pertinence

Active Publication Date: 2011-06-29
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0007] The existing post-stack wave impedance inversion method can only use one kind of post-stack seismic data, and the result of data processing is fixed. The data can be sedimentary information, structural information, or noise or other information. The results of the wave impedance inversion on this basis are not very targeted, and the prior sedimentary cycle information cannot be added to constrain the seismic data according to the reservoir prediction target, which makes the inversion results highly ambiguous and cannot meet the needs of reservoir prediction

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  • Wave impedance inversion method for deposition cycle restriction
  • Wave impedance inversion method for deposition cycle restriction
  • Wave impedance inversion method for deposition cycle restriction

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[0045] specific implementation plan

[0046] The specific implementation steps are described in conjunction with the accompanying drawings and examples.

[0047] When performing wave impedance inversion in an area, the corresponding post-stack seismic data, logging data (spontaneous potential, natural gamma ray, resistivity, core logging), geological data (lithology, velocity, sedimentary characteristics) should be carried out first. collection.

[0048] 1) From core and logging data, use seismic data interpretation technology to track seismic events and horizon interpretation of logging data, determine the range of the target layer for seismic inversion, and calibrate the range of the target layer to the seismic data near the well using conventional techniques;

[0049] The range of determining the target layer described in step 1) is based on known geological, well logging, and seismic data horizon results.

[0050] 2) Collect logging data and geological data, interpret se...

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Abstract

The invention relates to a wave impedance inversion method for deposition cycle restriction, wherein the method is capable of adding prior information according to a reservoir prediction target and meeting a reservoir prediction; the method comprises the following steps of: establishing a well logging and core deposition cycle initial model through logging information and geological data; scanning the frequency of a near-well seismic channel by using known reservoir thinness; changing the frequency band of the near-well seismic channel compared with the initial model; if the two models are similar to each other, determining the seismic deposition cycle model to be the data volume of wave impedance inversion so as to obtain an inversion wave impedance profile map. The inversion result has strong pertinence and quick speed; and the method solves the multiplicity of the current seismic inversion result, and the processing result can reflect the reservoir distribution of research area well.

Description

technical field [0001] The invention relates to oil exploration and development technology, in particular to a wave impedance inversion method using post-stack seismic data for sedimentary cycle constraints. Background technique [0002] Wave impedance inversion in petroleum exploration and development technology is the process of imaging the spatial structure and physical properties of underground rock formations by using seismic data from surface observations and taking known geological laws and drilling and logging data as constraints. Acoustic impedance inversion has clear physical meaning, and is a deterministic method for reservoir lithology prediction and reservoir characterization, and has good geological effects in practical applications. [0003] The current wave impedance inversion method is the Robinson convolution model, that is, the stack offset seismic record X(t) is expressed as: X(t)=K(t)*W(t), where W(t) is the seismic wavelet, and K(t) is the reflection c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40G01V1/28G01V1/36
Inventor 岳伏生徐广民
Owner BC P INC CHINA NAT PETROLEUM CORP
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