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Sedimentary rock reconstruction method and system

A sedimentary rock and rock technology, applied in the direction of material inspection, soil material testing, etc., can solve the problem of not considering the influence of rock particles and rocks

Active Publication Date: 2013-09-25
PETROCHINA CO LTD
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Problems solved by technology

In 1997 Bakke et al (Bakke and 1997) proposed a process method to simulate rock analogues, but this method only considered the final geometric shape results of the rock formation process, and did not consider the influence of the movement of rock particles during the rock formation process on rock formation

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  • Sedimentary rock reconstruction method and system
  • Sedimentary rock reconstruction method and system
  • Sedimentary rock reconstruction method and system

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Embodiment

[0081] In this embodiment, the reconstructed sedimentary rock is obtained by simulating three diagenetic processes of sedimentary rock: deposition, compaction and cementation.

[0082] First, according to the radius distribution of rock particles, randomly distributed rock particles are obtained, assuming that the radius of rock particles obeys a normal distribution, the minimum value is 20um, and the maximum value is 40um. Figure 7 The particle radius distribution shown. 2000 particles are randomly distributed in a cubic container of 0.6mm×0.6mm×1.4mm using particle radius distribution, and there is no overlap between particles and particles, as shown in Figure 9(a). The density of the particles is 2.65g / cm 3 , normal stiffness k n and tangential stiffness k t Both are 8.0×10 10 N / m, the fluid damping coefficient α and the collision damping coefficient β are 0 and 0.1, respectively.

[0083] The simulation of the sedimentation and compaction process of rock particles is...

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Abstract

The invention relates to a sedimentary rock reconstruction method and a sedimentary rock reconstruction system. The method comprises the steps that: rock particles with a fixed number are generated in a container with a fixed size according to rock particle radius distribution; the rock particles are subjected to sedimentation falling treatment under the effect of force, until the rock particles reach dynamic balance, wherein a condition of the dynamic balance is that a ratio of an average value of resultant force applied on the rock particles during the sedimentation falling process to an average contact force of contact points among the rock particles or a ratio of a maximal resultant force to a maximal contact force satisfies a priori condition; the dynamically balanced rock particles are subjected to a compaction treatment under the effect of formation pressure, until the strain of the integral rock particles on a vertical direction reaches certain threshold; and the rock particles obtained after the compaction treatment is cemented together, such that a rock is formed.

Description

technical field [0001] The invention relates to the field of sedimentary rock reconstruction, in particular to the analogue of sedimentary rock obtained by simulating the basic physical process of sedimentary rock formation - deposition, compaction and cementation. Background technique [0002] Over the past decades, various methods have been developed to reconstruct the microstructure of porous media. These are mainly divided into four categories: experimental methods, statistical methods, geometric methods and process methods. Among them, the experimental method directly obtains the pore structure of rocks through laboratory measurements, such as using traditional optical microscopes, scanning electron microscopes and CT scans to obtain two-dimensional images, and then combining these images to obtain three-dimensional pore structures (Yao et al., 1993; Seright et al., 2003), but there are laboratory constraints and resolution issues. Statistical methods use two-dimensio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 邹友龙李潮流胡法龙周灿灿李长喜刘忠华王昌学
Owner PETROCHINA CO LTD
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