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Compact sandstone soft porosity distribution inversion method

A technology of tight sandstone and porosity, applied in the field of rock physics, can solve problems such as difficult to apply, complex microstructure of tight sandstone, complex mineral components, etc.

Inactive Publication Date: 2020-04-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The microstructure of tight sandstone is relatively complex, and the mineral composition is complex, so the existing pore structure inversion method is difficult to apply, which requires the establishment of a suitable soft pore distribution inversion method to provide support for the prediction and development of tight sandstone reservoirs

Method used

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  • Compact sandstone soft porosity distribution inversion method
  • Compact sandstone soft porosity distribution inversion method
  • Compact sandstone soft porosity distribution inversion method

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Embodiment Construction

[0072] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0073] The present invention constructs a soft porosity distribution inversion method suitable for tight sandstone. First, the pores in the rock are divided into hard pores (the aspect ratio of the ellipsoid is a constant value) and soft pores with a series of different aspect ratio distributions, and the aspect ratio value of 0.01 is used as the boundary between soft pores and hard pores (that is, pores Aspect ratio values ​​less than 0.01 are soft pores, and those greater than or equal to this value are hard pores.). Then use the Voigt-Reuss-Hill average formula to calculate the equivalent modulus (quartz, mud) of the rock mineral matrix, and then use the Mori-Tanaka equivalent medium model (MT) to calculate the porosity and aspect ratio of the hard pores in the rock , and the porosity of the soft pores in the rock, and then use the formula for calculating the mini...

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Abstract

The invention provides a compact sandstone soft porosity distribution inversion method, and belongs to the field of rock physics. The method comprises the following steps of firstly, collecting the test data of a dry rock core sample; dividing the pores in the rock into hard pores and soft pores according to an aspect ratio; calculating the equivalent modulus of a rock mineral matrix, then calculating the porosity and the aspect ratio of hard pores in the rock, finally calculating the porosity and the fracture density of the soft pores in the rock, and calculating the distribution of the aspect ratio and the porosity of the soft pores under each effective pressure condition. According to the method, the classification of the pore structures is more suitable for the actual rocks, the methodis high in practicability and high in inversion result precision, can help to analyze the influence of the porosity and pore structure on the rock elastic property in the rock physical reservoir prediction, and the obtained pore structure distribution better conforms to the pore structure in the actual stratum and can accurately fit the actual rock pore structure characteristics.

Description

technical field [0001] The invention belongs to the field of rock physics, and in particular relates to an inversion method for tight sandstone soft porosity distribution. Background technique [0002] Seismic rock physics methods play an important technical support role in the exploration and development of unconventional oil and gas reservoirs, and can effectively describe the complex pore structure, physical properties and fluid-bearing properties of reservoirs. Physical properties, pore structure, and fluid are three important factors in the process of reservoir prediction and description. The influence of porosity and pore structure on rock elastic properties is one of the important aspects in exploration. In the process of impact, soft pores (fracture pores) as a simplified pore type have a key influence on rocks, so the inversion of soft porosity distribution of reservoir rocks based on petrophysical methods has also received more and more attention. [0003] The res...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6242G01V2210/6244
Inventor 王欢沈珲刘卫华李博南司文朋
Owner CHINA PETROLEUM & CHEM CORP
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