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Sandstone rock physical modeling method based on equivalent pore theory

A petrophysical modeling and pore technology, which is applied in the field of oil and gas geophysical exploration, can solve problems such as insufficient description, poor pertinence, difficulty in rock skeleton density, true porosity and permeability

Inactive Publication Date: 2017-09-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] However, these petrophysical models based on particle contact theory are not fine enough to describe the pore characteristics of tight sandstones, and are not very specific, which leads to the insufficient applicability of these models to low-porosity sandstones.
It is difficult to detect seismic fluids from rock physics models, it is difficult to determine rock skeleton density, clay content and clay type, true porosity and permeability, and there are problems in reservoir evaluation with logging and seismic data

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  • Sandstone rock physical modeling method based on equivalent pore theory
  • Sandstone rock physical modeling method based on equivalent pore theory
  • Sandstone rock physical modeling method based on equivalent pore theory

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Embodiment approach

[0043] As an embodiment of the present invention, such as figure 1 As shown, the method includes: the first step, collecting core samples, performing component analysis, and obtaining the mineral composition data of the core; the second step, making rock thin slices, performing pore feature analysis under a microscope, classifying pore types, and counting each The percentage of the pore type; the third step, input the ratio and modulus of the constituent rock minerals, and calculate the elastic modulus of the rock matrix mixed with various minerals; the fourth step, add different types of pores to the rock matrix in turn to obtain The dry rock is calculated to obtain the skeleton modulus of the dry rock containing pores; the fifth step is to add fluid to the dry rock to calculate the elastic modulus of the whole rock.

[0044]In order to facilitate the understanding of the solutions and effects of the embodiments of the present invention, a specific application example is give...

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Abstract

The invention belongs to the field of oil gas geophysical exploration and provides a sandstone rock physical modeling method for tight sandstones. The method comprises the steps of constructing a rock core matrix model; constructing a rock framework model; constructing a rock fluid-containing model; and predicting the elastic properties of rocks. The invention provides a novel compact sandstone rock physical model containing different porosity characteristics, wherein the quantitative relationship among the mineral composition, the porosity, the pore type, the fluidity-containing property and rock elasticity parameters is established. The rock core and well-logging data-based calibration fully proves the good application prospect of the model.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysical exploration, and the exploration object is sandstone oil and gas reservoirs. The invention specifically relates to a method for constructing a sandstone petrophysical model based on an improved equivalent pore theory. Background technique [0002] The main task of rock physics is how to relate the physical parameters of underground rocks with elastic parameters (such as velocity and density). The mineral composition, porosity, fluidity and even pore shape of the rock will affect the elastic modulus of the rock. In order to study and simulate the relationship between the complex underground rock and the modulus, people developed the KT theory (Kuster and Toksoz, 1974) , self-consistent model (O'Connelland Budiansky, 1974), equivalent differential medium theory (Cleary, 1980; Zimmerman, 1991). Some classical petrophysical modeling methods rely on the establishment of the relationship between ...

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Application Information

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IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 周枫刘卫华奚相
Owner CHINA PETROLEUM & CHEM CORP
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