Method for determining occurrence state of movable oil in dense oil reservoir micro/nano pore throat system

A technology of micro-nano pores and measurement methods, applied in the direction of material inspection products, etc., can solve the problem of the difficulty in the state of movable oil, and achieve the effect of overcoming volatility and accurate distribution range

Inactive Publication Date: 2014-04-23
PETROCHINA CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring the occurrence state of movable oil in the micro-nano pore-throat system of tight oil reser

Method used

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  • Method for determining occurrence state of movable oil in dense oil reservoir micro/nano pore throat system
  • Method for determining occurrence state of movable oil in dense oil reservoir micro/nano pore throat system
  • Method for determining occurrence state of movable oil in dense oil reservoir micro/nano pore throat system

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specific Embodiment

[0025] In this example, a group of determination experiments of movable oil occurrence in 4 measuring points of 3 samples from Well D61 at 2059.3m, Well R59 at 2121m, and Well Q238 at 1605.2m in the fourth member of Quantum Formation in the southern Songliao Basin were carried out. Among them, two measuring points were measured at 1605.2m in well Q238.

[0026] in, figure 2 It is the 2059.3m movable oil film occurrence form of well D61 in a specific embodiment of the present invention, figure 2 (a) is the core photo of the 2059.3m sample in Well D61, figure 2 (b) is a photo of the occurrence of movable oil film in the microscopic pores of the 2059.3m sample of Well D61 under the ring scanning electron microscope, figure 2 (c) is the movable oil film spectrum of the 2059.3m sample in Well D61; image 3 It is the movable oil film occurrence form of 2121m in well R59 in a specific embodiment of the present invention, image 3 (a) is a photo of the occurrence of movable oi...

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Abstract

The invention provides a method for determining the occurrence state of movable oil in a dense oil reservoir micro/nano pore throat system. The method comprises the following steps: (1) selecting a core sample; (2), setting an observation parameter of a field emission-environment scanning electron microscope, and observing a movable oil film in the rock sample; (3) determining the element content of the observed mobile oil film by an energy disperse spectroscopy, and if the carbon content is 50-90%, determining the observed movable oil film to be movable oil; and (4) expanding the peripheral area of the movable oil film, repeating the step (3), and if the carbon content is gradually reduced to below 30%, representing that the occurrence of the movable oil film is small, so as to determine the distribution range of the observed movable oil. By adopting the method disclosed by the invention, the difficulty that the movable oil is easy to volatilize and not easy to identify can be overcome, the problem that the resolution ratio in a conventional method cannot meet the requirements of crude oil observation in the micro/nano pore throat system is solved, and the occurrence state and the distribution range of the movable oil in the micro/nano pore throat can be accurately observed.

Description

technical field [0001] The invention relates to the field of increasing oil and gas storage and production, in particular to a testing method, in particular to a method for measuring the occurrence state of movable oil in micro-nano pore-throat systems of tight oil reservoirs. Background technique [0002] Tight oil is the current research hotspot, and it is also an important part of increasing reserves and production of oil and gas resources. At present, scholars at home and abroad have carried out a large number of effective exploratory studies on the characterization of tight oil micro-nano pore-throat systems, and put forward many forward-looking research results. At present, it is generally believed that micro-nano pore-throats are the main storage space of tight oil reservoirs. Effectively characterizing the occurrence form and space of tight oil in micro-nano pore throats is of great significance for clarifying the accumulation, occurrence and evaluation of tight oil ...

Claims

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Application Information

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IPC IPC(8): G01N33/28
Inventor 邹才能公言杰柳少波朱如凯刘可禹姜林袁选俊陶士振
Owner PETROCHINA CO LTD
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