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Post-stack earthquake wave impedance inversion method

A wave impedance inversion, seismic wave technology, applied in the field of geophysical exploration, can solve problems such as large impact

Active Publication Date: 2016-02-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a post-stack seismic wave impedance inversion method for the shortcomings of the existing post-stack seismic wave impedance inversion method, which is greatly affected by the compaction effect of strata, and the use of wave impedance to identify lithology has multiple solutions.

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[0030] In the following, the embodiment of the present invention will be further described in detail in combination with examples of decompaction wave impedance inversion and reservoir prediction in Liutun sub-sub-sag of Dongpu depression and reservoir prediction examples and accompanying drawings. Depend on figure 1 As can be seen, the concrete steps of the present invention are as follows:

[0031] 1. Obtain the post-stack pure wave data, geological stratification data, and well logging curves of the seismic processing results in the No.

[0032] 1.1 Standardized processing of logging curves: use the histogram method to standardize the editing and processing of acoustic curves, which is carried out in two steps. First, select standard layers that can be compared and tracked. Layers or layer groups, mudstone intervals encountered by most wells in the work area, and close to or on the target interval of the inversion; secondly, use intersection analysis technology to make the...

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Abstract

The invention relates to a post-stack earthquake wave impedance inversion method and belongs to the technical field of geophysical exploration. The method comprises the steps of: extracting earthquake wavelets by means of data processing; establishing well-earthquake time depth relations of all wells in a work area to be inversed; calibrating the reflection position of each lithologic interface on an earthquake profile; generating wave impedance curves of time domains of all the wells, and carrying out decompaction correction on the wave impedance curves; establishing a geological construction framework model and an earthquake wave impedance inversion initial model of the work area to be inversed; and finally carrying out post-stack earthquake wave impedance inversion on the earthquake wave impedance inversion initial model of the work area to be inversed, and obtaining a decompaction wave impedance inversion result. The post-stack earthquake wave impedance inversion method effectively eliminates the lithology identification multi-solution influence of a compaction effect of stratum deposition on the earthquake wave impedance, the wave impedance data obtained by inversion can practically and vertically reflect the stratum deposition rhythm changes and can practically and transversely reflect the lithology changes, so that the exploration disposition of an oil field is well guided.

Description

technical field [0001] The invention relates to a post-stack seismic wave impedance inversion method, which belongs to the technical field of geophysical exploration. Background technique [0002] With the deepening of petroleum exploration and development, the conventional method of horizon interpretation based on seismic event tracking cannot well meet the geological needs of reservoir identification and interpretation. Improving the ability of seismic data to identify reservoirs with the help of seismic wave impedance inversion has become an important technical means for reservoir prediction and reservoir description. Seismic inversion is a process of understanding the spatial structure and physical properties of underground strata by using seismic data from surface observations and constrained by known geological laws and drilling and logging data. Wave impedance inversion refers to the special seismic processing and interpretation technology for inverting formation wav...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306
Inventor 梁国胜苏惠刘红磊王德波孙力韩燕君徐炳文张天增
Owner CHINA PETROLEUM & CHEM CORP
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