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Compact quartz sandstone porosity recovery simulating method

A simulation method and porosity technology, applied in geophysical measurement, instruments, etc., can solve the problems of demanding data and unavailable applications in production fields

Inactive Publication Date: 2018-08-03
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Its disadvantage is that the requirements for data are relatively strict, and it is mainly suitable for small-scale test applications.
[0006] Therefore, the existing simulation methods have many shortcomings and cannot be widely used in the production field.

Method used

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  • Compact quartz sandstone porosity recovery simulating method
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Embodiment Construction

[0054] The present invention is described in detail below.

[0055] A pore recovery simulation method for tight quartz sandstone, comprising the following steps:

[0056] Step 1: Establishment of pore compaction model of tight quartz sandstone in early diagenetic stage.

[0057] In the early stage of diagenesis, the pore evolution of quartz sandstone is mainly controlled by compaction, and the mathematical model at this stage is:

[0058]

[0059] In formula (1), is the residual porosity of tight quartz sandstone in the diagenetic stage, is the original porosity of tight quartz sandstone, h is the depth, and a is an undetermined constant;

[0060] The mathematical model of is:

[0061]

[0062] S 0 is the sorting coefficient, and its calculation method is:

[0063] S0=(P 25 / P 75 ) 1 / 2 (3)

[0064] P 25 ,P 75 Respectively represent the particle diameters corresponding to 25% and 75% of the particle content on the cumulative curve;

[0065] The method of f...

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Abstract

The invention provides a compact quartz sandstone porosity recovery simulating method. According to the invention, a compact quartz sandstone porosity compaction model in an early diagenesis phase isestablished; a compact quartz sandstone cementing contraction model is established; a compact quartz sandstone acidification pore retaining model is established; compact quartz sandstone porosity recovery simulation is performed, stage division is performed according to diagenesis, boundary conditions of the compaction model and the cementing model are found, an acidification window is set, petrography data is input and simulation precision and conditions are set for solving; three influence results are obtained through iteration solution and a simulation result is exported, and a compact quartz sandstone porosity evolutionary process is obtained. According to the invention, by adopting a method for calculating the quartz cementing progress to perfrom simulation study on quartz sandstone porosity, real time modification on residual porosity is performed through porosity mathematic models describing a compaction process and an acidification process, and simulation process proceeds segment by segment through fine analysis on diagenetic stages, so that change of porosity in the diagenetic process is described accurately.

Description

technical field [0001] The design of the present invention is applicable to the fields of sedimentary petrology and oil and gas geochemistry, and particularly relates to a porosity restoration simulation method of tight quartz sandstone, specifically by simulating the impact of changes in pore fluids caused by hydrocarbon generation on the development of sandstone densification during the diagenesis process of simulating basin burial A method for recovering the pore evolution of tight quartz sandstones using diagenesis and hydrocarbon generation kinetics. Background technique [0002] The evolution law of sandstone porosity is not only one of the basic laws of basic geological research (such as sedimentary diagenesis, rock mechanics, etc.), but also an important aspect in the application field of petroleum geology (such as burial history analysis, paleostructural restoration, and paleoformation pressure prediction, etc.). Indispensable and important theoretical basis. Rock ...

Claims

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Application Information

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IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 李艳霞盛伟琰郭建明
Owner XI'AN PETROLEUM UNIVERSITY
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