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Method for determining reservoir physical property of sandstone before cementation

A technology of reservoir physical properties and cementation, which is applied in the preparation of test samples, measurement devices, suspensions and porous material analysis, etc., can solve the problem of inaccurate physical properties of sandstone reservoirs, and achieve accurate results without the influence of human factors Effect

Inactive Publication Date: 2020-01-17
PETROCHINA CO LTD
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Problems solved by technology

[0004] Aiming at the above-mentioned problems such as inaccurate acquisition of sandstone reservoir physical properties by existing methods, the present invention provides a method for determining the physical properties of sandstone reservoirs before cementation occurs, which can accurately determine the physical properties of sandstone reservoirs before strong acid salt cementation occurs, which is a great contribution to geology. Provide reference for physical property evolution restoration of sandstone reservoirs in historical period

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  • Method for determining reservoir physical property of sandstone before cementation
  • Method for determining reservoir physical property of sandstone before cementation
  • Method for determining reservoir physical property of sandstone before cementation

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Embodiment Construction

[0024] In the following, the present invention will be specifically described through exemplary embodiments. It should be understood, however, that elements, structures and characteristics of one embodiment may be beneficially incorporated in other embodiments without further recitation.

[0025] Early strongly cemented sandstone is common in reservoirs, and the physical property evolution of this type of sandstone is usually only affected by early cementation and pre-cementation compaction.

[0026] For the determination of the physical properties of sandstone reservoirs prior to cementation of the above types of rocks, see figure 1 , an embodiment of the present invention provides a method for determining the physical properties of sandstone reservoirs before cementation occurs, and the specific steps are:

[0027] S1. For a certain sandstone reservoir, take a plurality of early-stage strongly cemented rock samples, drill, cut and polish each rock sample to obtain a rock sa...

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Abstract

The invention relates to a method for determining a reservoir physical property of sandstone before cementation. In the method, based on measurement of a physical property of early strongly cemented sandstone, that is, measurement of porosity phi0 and permeability K0, a dilute acetic acid solution is used to dissolve cement in the early strongly cemented sandstone, to restore a sandstone status before the sandstone is strongly cemented. Then, a physical property of a sandstone sample is directly measured, and porosity phi1 and permeability K1 obtained from the measurement are the reservoir physical property before the cementation, so as to determine the reservoir physical property before the cementation. The method effectively avoids a human factor effect in a statistics and calculation process, is more consistent with an actual geological condition, and has a more accurate result.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and in particular relates to a method for determining the physical properties of sandstone reservoirs before cementation occurs. Background technique [0002] With the continuous improvement of oil and gas exploration in the middle and shallow layers and the increasing demand for oil and gas reserves, the target of oil and gas exploration has gradually shifted to the deep layer. The potential of deep oil and gas resources in my country is huge, and oil and gas exploration has achieved gratifying results. Medium-deep sandstone reservoirs have undergone complex diagenetic transformation during the burial process, and the reservoir porosity has also undergone complex evolution processes in the geological history period. The matching relationship between the reservoir porosity evolution history and the hydrocarbon generation and expulsion history of source...

Claims

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Application Information

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IPC IPC(8): G01N1/30G01N15/08
CPCG01N1/30G01N15/08G01N15/088
Inventor 周立宏孙沛沛操应长远光辉王艳忠付立新楼达蒲秀刚李宏军李会慎
Owner PETROCHINA CO LTD
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