A Multipoint Geostatistical Sedimentary Facies Modeling Method
A technology of geostatistics and modeling methods, applied in the field of oil and gas reservoir characterization and modeling, can solve the problems of high-frequency jitter, insufficient consideration of facies scale, etc., and achieve high-frequency jitter suppression, improved continuity, and stable distribution Effect
Active Publication Date: 2020-06-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Traditional multi-point geostatistics focuses on characterizing the spatial structure and geometry of sedimentary facies, but does not take into account the scale of facies, and there is high-frequency jitter in describing the contact continuity of facies
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[0060] Such as figure 1 As shown, the multi-point geostatistical sedimentary facies modeling method proposed by the present invention mainly includes the following steps:
[0061] Step 100: Carry out model fitting for the study area under the guidance of the geological conceptual model, perform multi-dimensional interaction in single well, profile, plane and three-dimensional space, and establish a prototype model;
[0062] Step 200: Establish a training image conforming to the depositional model and a search tree based on the prototype geological model, and perform variogram analysis on the prototype geological model to obtain the range La, Lb and Lc of the geometric factors in the three directions of i, j, and k ;
[0063] Step 300: Determine whether conditional data exists in the region space:
[0064] If there is conditional data, build a grid, distribute the conditional data to the nearest grid node, introduce geometric factors, construct a geometric factor space around...
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The invention discloses a multipoint geostatistical sedimentary facies modeling method. According to the method, on the basis of an original multipoint geostatistical sedimentary facies modeling method, the concept of geometrical factors is proposed, a geometrical factor limited space is adopted to solve a conditional probability reflecting the scale of a sedimentary facies belt, a correction proportion identical equation is adopted to correct a condition probability distribution curve obtained after a training image is scanned, and the original multipoint geostatistical method is improved. An experiment of performing modeling by the adoption of an improved algorithm indicates that the multipoint geostatistical method which the geometrical factors are introduced into inherits advantages of reproduction of the geometrical morphology of sedimentary facies through traditional multipoint geostatistics, and the defects of the traditional multipoint geostatistics in facies belt scale treatment, continuity and other aspects are overcome.
Description
technical field [0001] The present invention relates to the technical field of characterization and modeling of oil and gas reservoirs, in particular to a multi-point geostatistical sedimentary facies modeling method, which is used for carbonate rock shoals with ring-shaped sedimentary facies combination modes of different scales Stochastic modeling of facies reservoirs. Background technique [0002] Geostatistics was created in the early 1960s by Professor G. Machilong, a famous French scholar. He combined the traditional statistical theory with the concept of regional variables, and developed a set of mathematical techniques to study the regional distribution of mineral mineralization characteristics by using the variation function as a tool. After that, kriging technology and stochastic simulation technology were developed. Until the mid-1980s, stochastic simulation technology was dominated by unconditional simulation. The common ones are Fourier spectrum estimation me...
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IPC IPC(8): G06T17/05
CPCG06T17/05
Inventor 廉培庆李剑谭学群牛宇虹张俊法徐樟有张文彪高慧梅杜秀娟
Owner CHINA PETROLEUM & CHEM CORP