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Method of predicting reservoir by using seismic attributes

A technology of seismic attributes and seismic attribute bodies, applied in the direction of seismic signal processing, etc., can solve the problem that reservoir seismic prediction technology cannot be effectively predicted, and achieve the effect of improving the prediction coincidence rate.

Inactive Publication Date: 2019-05-21
PETROCHINA CO LTD +1
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Problems solved by technology

[0004] The present invention aims to overcome the problem that the existing reservoir seismic prediction technology in the background technology cannot make effective predictions, and provides a method for predicting reservoirs using seismic attributes

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  • Method of predicting reservoir by using seismic attributes
  • Method of predicting reservoir by using seismic attributes
  • Method of predicting reservoir by using seismic attributes

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Embodiment 1

[0031] The seismic attributes of FⅡ11 layer in a block of Daqing Oilfield were extracted, and the correlation analysis was carried out with the sandstone and mudstone in the block, among which the sandstone had the highest correlation with the instantaneous amplitude attribute, and the mudstone had the highest correlation with the instantaneous frequency attribute. Using neural network clustering analysis, the instantaneous amplitude and instantaneous frequency are clustered to form 20 types of comprehensive seismic attributes.

[0032] The composite seismic attributes are then normalized by predictive power. Take the instantaneous amplitude as the x-axis, the instantaneous frequency as the y-axis, and the comprehensive seismic attribute as the z-value to make a cross diagram for analysis ( figure 1 Contrast analysis before and after multi-attribute clustering), normalized according to high-range mid-frequency, medium-range mid-frequency, low-range high-frequency, low-range lo...

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Abstract

The invention relates to a method for predicting a reservoir by using seismic attributes. The method mainly solves the problem that the existing reservoir earthquake prediction technology cannot perform effective prediction. The method is characterized by comprising the following steps: (1) carrying out attribute extraction on seismic data of a certain research area to obtain various seismic attributes; (2) producing a synthetic seismic record of wells in the research area, and respectively selecting a seismic attribute body with the best correlation with sandstone and a seismic attribute bodywith the best correlation with mudstone; (3) normalizing the comprehensive seismic attribute body according to the sandstone prediction capability of the comprehensive seismic attribute body; (4) establishing a time domain small-layer stratigraphic framework model of the research area by utilizing well layering data and seismic horizon data, and drawing a comprehensive seismic attribute plane graph of each small layer; and (5) for each small layer in the stratigraphic framework model, calibrating the comprehensive seismic attribute plane graph by using sandstone and mudstone data to obtain aseismic face plane graph reflecting the sandstone and mudstone prediction capability. The method can improve the prediction coincidence rate of the inter-well sand body.

Description

technical field [0001] The invention relates to the technical field of seismic prediction of oilfield reservoirs, in particular to a method for predicting reservoirs using seismic attributes. Background technique [0002] Generally speaking, reservoir seismic prediction technology can be roughly divided into seismic inversion method and seismic attribute analysis technology. The main body of earthquake prediction technology. [0003] The three seismic attributes of amplitude, frequency, and phase have poor correlation with sandstone thickness, and other seismic attributes derived from these three attributes cannot be predicted, and a single seismic attribute cannot be effectively predicted. The inversion prediction method is commonly used in the development stage to be geostatistical inversion. The high-frequency information of the inversion results is mainly controlled by the well, and the inversion results are a set of equal probability volumes. The prediction results of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 付志国迟博吕金龙杨桂南唐振国孙鹏鹏李照永王建凯孙淑艳
Owner PETROCHINA CO LTD
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