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A method of porosity based on the union dictionary

A technology of porosity inversion and porosity, which is applied in the field of geostatistics to achieve the effect of reducing the inversion period, solving poor applicability and improving utilization rate

Active Publication Date: 2022-02-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Affected by the cost of exploration and development, often only a small amount of logging data can be collected, and the existing seismic inversion solution method only uses and solves a single or part of the parameters
Although the dictionary inversion method can have good adaptability to the actual complex geological structure, the existing technology can only calculate part of the elastic parameters

Method used

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  • A method of porosity based on the union dictionary
  • A method of porosity based on the union dictionary
  • A method of porosity based on the union dictionary

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Experimental program
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Effect test

Embodiment 1

[0122] The method of the present invention is applied to Marmousi model data to verify the validity of the method. first according to figure 2 The Marmousi impedance model shown in Fig. image 3 shown. One is the porosity model generated by the negative correlation of the Marmousi impedance model, as Figure 4 shown. In the figure, the ordinate (Time) represents time, and the abscissa (Tracenumbers) represents gathers. And add 30dB Gaussian white noise to the two models respectively.

[0123] For the Marmousi wave impedance model, the present invention uses the Reich wavelet with a dominant frequency of 35 Hz and uses a convolution model to generate theoretical seismic data. Unlike other methods, the method of the present invention needs to learn a joint dictionary with different parameters Therefore, the method of the present invention extracts 10 well data at equal intervals from the model wave impedance and porosity data as training data. The training size this tim...

Embodiment 2

[0137] In order to further illustrate the practical application ability of the method of the present invention, the method of the present invention is applied to a work area of ​​a gas field in central Sichuan, China. The resistance and porosity data of the well logging are processed by sliders with an atomic size of 20 and a step size of 1 to obtain a joint dictionary training set, and a joint dictionary set of impedance and porosity is obtained through joint dictionary learning. Figure 10 The dictionary set (part) obtained from training in this embodiment, wherein a) Ip_Dic is the learned impedance dictionary, and b) Por_Dic is the learned porosity dictionary. It can be clearly observed that the learned dictionary atoms exhibit different relationships between impedance and porosity. Table 2 shows Figure 10 The linear fit coefficients for the corresponding atoms in .

[0138] Table 2 Figure 5 Fitting coefficients for different dictionary atoms in

[0139]

[0140] F...

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Abstract

The invention discloses a porosity inversion method based on a joint dictionary, comprising the following steps: S1, data preprocessing: performing block processing on the logging data; S2, performing dictionary learning on the block processing log data, Obtaining an impedance dictionary and a porosity dictionary; S3, performing dictionary-based porosity inversion on the seismic data to obtain impedance and porosity of the seismic data. The present invention starts from logging data, introduces dictionary learning and sparse representation theory, realizes the construction of porosity dictionary inversion method, solves the disadvantage of poor applicability of traditional methods for solving porosity in complex geological structures, and can invert to solve more logging physical parameters. A feasible scheme is provided to improve the utilization rate of well logging data in inversion, reduce the inversion cost and cycle, and improve the utilization rate of well logging data in the inversion process.

Description

technical field [0001] The invention belongs to the technical field of geostatistics, in particular to a porosity inversion method based on a joint dictionary. Background technique [0002] Reservoir physical parameters are an important basis for reservoir prediction and evaluation. Porosity is one of the most basic reservoir physical parameters, and its accurate estimation can provide a reliable reference for reservoir prediction. The methods for obtaining reservoir porosity are mainly divided into direct measurement method and indirect interpretation method. The direct measurement method obtains the porosity through core measurement, and the latter obtains it through logging data interpretation. The porosity obtained by core drilling and petrophysical analysis is the most accurate (Pan Xinpeng et al., 2018), but the cost of sampling and testing is high, and the difficulty of obtaining porosity increases with the increase of drilling depth, so direct measurement The method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/50G01V1/30G06F17/18G06K9/62
CPCG01V1/50G01V1/306G01V1/307G06F17/18G01V2210/6244G01V2210/63G06F18/28G06F18/214
Inventor 王峣钧刘超张归前陈挺胡光岷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA