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Establishing method and application of rock physical model of unconventional tight sandstone reservoir

A petrophysical model and a method for establishing a technology, applied in the field of oil and gas geophysics, can solve the problems of inability to accurately characterize the petrophysical characteristics of unconventional tight sandstone reservoirs, ignoring tight sandstone low porosity and permeability, and strong mean value.

Active Publication Date: 2020-02-21
PETROCHINA CO LTD
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  • Summary
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Problems solved by technology

[0004] At present, the rock physics modeling method widely used in the field of seismic rock physics modeling technology mainly uses the Wood formula to obtain the mixed fluid equivalent modulus to construct an equivalent medium model for conventional reservoirs, ignoring the low porosity of tight sandstone. characteristics such as strong permeability and average value, and the particularity of the influence of gas saturation on the elastic characteristics and velocity of pore fluid
For unconventional tight sandstone reservoirs, if the existing petrophysical model is still used, it is impossible to accurately characterize the petrophysical characteristics of unconventional tight sandstone reservoirs

Method used

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  • Establishing method and application of rock physical model of unconventional tight sandstone reservoir
  • Establishing method and application of rock physical model of unconventional tight sandstone reservoir
  • Establishing method and application of rock physical model of unconventional tight sandstone reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 A method for establishing a petrophysical model of an unconventional tight sandstone reservoir is shown, including the following steps

[0045] A method for establishing a petrophysical model of an unconventional tight sandstone reservoir, characterized in that it includes the following steps

[0046] Step 1: Building a Rock Skeleton Model

[0047] According to the test temperature, pressure, rock mineral composition content, elastic modulus, rock porosity, pore shape, density, and fluid property parameters, simulate the temperature and pressure environment of the core sample test, and establish a rock skeleton model based on the equivalent medium theory to obtain the rock The equivalent elastic modulus data of the skeleton;

[0048] Step 2: Build a mixed fluid model

[0049] According to the first step to simulate the temperature and pressure environment of the core sample test, the mixed fluid model is established by using the equivalent modulus fo...

Embodiment 2

[0058] Such as figure 1 The petrophysical model establishment method of a kind of unconventional tight sandstone reservoir shown is different from Embodiment 1 in that: the step 1 establishes the rock skeleton model, by combining mineral percentage content and mineral elastic modulus parameters with Enter the Voigt-Reuss-Hill formula to obtain the equivalent elastic modulus data of the rock skeleton matrix; bring the equivalent elastic modulus data of the rock skeleton matrix, rock porosity, and pore shape parameters into the DEM model to obtain the equivalent elastic modulus data of the rock skeleton Quantitative data.

[0059] In actual use, the adoption of this technical solution makes the acquisition of the equivalent elastic modulus data of the rock skeleton matrix and the equivalent elastic modulus data of the rock skeleton more simple, convenient and accurate, and lays a good foundation for the use of subsequent data.

Embodiment 3

[0061] Such as figure 1 The petrophysical model establishment method of an unconventional tight sandstone reservoir shown is different from Example 2 in that: the mineral percentage content, mineral elastic modulus, porosity and pore shape parameters are obtained through tight sandstone Core samples are obtained from conventional core analysis tests.

[0062] In actual use, the mineral percentage, mineral elastic modulus, porosity and pore shape data are obtained through this scheme, which makes the experimental test data of tight sandstone core samples more fully utilized, and the obtained results are more applicable .

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Abstract

The invention belongs to the technical field of petroleum and natural gas geophysics, and particularly relates to an establishing method and application of a rock physical model of an unconventional tight sandstone reservoir. Experimental data of a lot of tight sandstone core samples is used, and on the basis of a equivalent medium theory, steps of establishing a rock skeleton model, establishinga mixed fluid model, establishing an isotropic saturated rock model and establishing a rock physical model of the unconventional tight sandstone reservoir are included. Thus, the rock physical characteristics of the e unconventional tight sandstone reservoir can be accurately represented, a theoretical basis is provided for optimization of a seismic reservoir prediction technology and seismic inversion quantitative interpretation, and the risk of seismic interpretation is reduced.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas geophysics, and in particular relates to a petrophysical model establishment method and application of unconventional tight sandstone reservoirs. Background technique [0002] With the in-depth refinement of oil and gas exploration and development, the target reservoirs have expanded from conventional reservoirs to more complex unconventional reservoirs, and the requirements for reservoir prediction accuracy are getting higher and higher. For sandstone reservoirs, the geological characteristics of conventional high-permeability porous sandstone reservoirs and unconventional tight sandstone reservoirs are very different, the geophysical response characteristics are quite different, and the petrophysical models are also very different. How to more accurately simulate the unconventional tight sandstone reservoir and establish a petrophysical model suitable for the reservoir has beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01N33/24
CPCG01V1/282G01N33/24
Inventor 王大兴刘峰张盟勃王永刚蔡克汉杜广宏
Owner PETROCHINA CO LTD
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