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Method and system for constructing low-frequency model of carbonate palaeochannel seismic inversion

A carbonate rock and seismic inversion technology, which is applied in the field of oil and gas geophysical exploration, can solve the problem of missing rivers and achieve the effect of improving the inversion effect

Active Publication Date: 2021-01-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, conventional modeling methods are mainly based on horizon and well data and use trigonometric functions, inverse distance weighting, or Kriging interpolation to obtain low-frequency models, which can easily lose river facies in low-frequency models.

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  • Method and system for constructing low-frequency model of carbonate palaeochannel seismic inversion

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[0040] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by 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 disclosure to those skilled in the art.

[0041] The invention discloses a method for constructing a low-frequency model for carbonate paleo-channel seismic inversion. The method comprises the following steps:

[0042] Extracting sensitive seismic attributes of carbonate paleochannel reservoirs;

[0043] Based on well logging data, horizon interpretation data and seismic data, the inversion low-frequency model is constructed;

[0044] Based on the seismic attributes and the low frequ...

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Abstract

The invention provides a carbonate rock ancient riverway seismic inversion low-frequency model construction method and system. The method comprises the following steps: extracting sensitive seismic attributes of carbonate rock ancient riverway reservoirs; based on logging data, horizon interpretation data and seismic data, carrying out inversion low-frequency model construction; and based on the seismic attributes and the low-frequency model, constructing a low-frequency model based on river phase control constraint. Based on the river phase control constraint low-frequency model, pre-stack elasticity parameter inversion is carried out, and carbonate rock reservoir paleochannel reservoir rock elasticity parameters are obtained. According to the method, the influence of an interpolation algorithm on the low-frequency model is reduced, seismic attributes are added in the process of establishing the low-frequency model to serve as constraints, the introduced seismic attributes are preferred amplitude attributes, and the development condition of a river can be represented on a plane. The inversion effect is improved, and the river distribution condition can be obviously seen on the plane.

Description

technical field [0001] The invention relates to the field of oil and gas geophysical exploration, relates to a seismic identification technology for carbonate paleo-channel reservoirs, and in particular relates to a low-frequency model construction method and system for carbonate paleo-channel seismic inversion. Background technique [0002] The carbonate fracture-cavity reservoirs represented by Tahe Oilfield are the products of multi-stage tectonic movements and karst cycles. Paleo-underground river-type oil reservoirs have large karst caves and pores as the main storage space, and the spatial distribution is complex. The research on the spatial distribution and filling degree of the underground river system is the key to study the connectivity of this type of oil reservoir. At present, the spatial distribution, filling characteristics, connectivity and flooding characteristics of the caves in the underground river are not well understood, which seriously restricts this ty...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/301
Inventor 胡华锋马灵伟杨丽吕慧胡起
Owner CHINA PETROLEUM & CHEM CORP
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