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Method for testing tight oil occurrence state of reservoir stratum through CT quantitative and three-dimensional visualization

A technology of occurrence state and tight oil, which is used in the field of 3D visualization to test the occurrence state of tight oil in reservoirs and quantitative CT to achieve the effect of high certainty

Active Publication Date: 2016-06-08
PETROCHINA CO LTD
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Problems solved by technology

The analysis of oil-bearing slices is to observe and analyze the distribution of remaining oil by analyzing oil-bearing core slices from sealed coring, but only the planar and local remaining oil distribution characteristics can be observed; Precise photolithography onto flat glass, making a microscopic simulation model, and then using a microscope to zoom in on the pore level to investigate the distribution of oil and water in the process of water flooding, but this method ignores the impact of interstitials on the distribution of remaining oil; numerical simulation The rule is to use the modeled network to replace the complex pore space in the porous medium, and conduct random simulation at the microscopic level to study the seepage law in the porous medium. Although it has the characteristics of repeatability and controllability, it has great uncertainty. sex

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  • Method for testing tight oil occurrence state of reservoir stratum through CT quantitative and three-dimensional visualization
  • Method for testing tight oil occurrence state of reservoir stratum through CT quantitative and three-dimensional visualization
  • Method for testing tight oil occurrence state of reservoir stratum through CT quantitative and three-dimensional visualization

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Embodiment 1

[0037]Cores from the Chang 7 tight oil reservoir in the Ordos Basin were selected. The core must be closed and cored. Drill a short core column with a size of 0.3cm×1cm in the core; put the short core column into the melted wax slurry for sealing and wrapping, so as to prevent the tight oil and water in the core column from losing during the CT scanning process, but the wax layer The thickness should not exceed 1mm. After the core column is sealed with wax, a nano-CT non-destructive testing instrument is used to perform CT scanning on the core column, and a 360° two-dimensional slice image of the core column is obtained through the radiation emission of the X-ray tube, the rotation of the mechanical turntable, and the signal reception of the detector. The basic working principle is that after the ray is emitted from the ray tube and passes through the measured object, due to the relationship between the material, density and thickness of the measured object, the ray will have...

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Abstract

The invention provides a method for testing the tight oil occurrence state of a reservoir stratum through CT quantitative and three-dimensional visualization. The method comprises the following steps of providing fresh rock core samples in the reservoir stratum; performing CT scan on rock cores so as to obtain two-dimensional slicing images; differentiating out tight oil, water, rock particles and holes by grey scales, and performing digital reconstruction on the two-dimensional slicing images so as to obtain three-dimensional images; and dividing the tight oil into different occurrence states, performing statistics on the volume of the tight oil in each occurrence state, and analyzing the volume or the mass of the tight oil in each occurrence state. Through the adoption of the method, the microcosmic occurrence state of the impact oil in a micro nanometer pore throat can be quantitatively analyzed.

Description

technical field [0001] The invention relates to a method for quantitatively and three-dimensionally visually testing the occurrence state of tight oil in a reservoir by CT, and belongs to the technical field of petroleum exploitation. Background technique [0002] The research on the occurrence state of tight oil in the field of petroleum geology at home and abroad is mainly aimed at the relationship between oil and water in macroscopic tight reservoirs, and no relevant literature has been found on the microscopic occurrence state of tight oil in micro-nano pore throats and its research methods. Although a lot of explorations have been made on the macroscopic and microscopic remaining oil in the reservoir in the field of development at home and abroad, but no systematic research and exploration has been made on the microcosmic occurrence. In terms of macroscopic remaining oil research, the macroscopic distribution of tight oil in reservoirs is mainly observed and predicted b...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/087
Inventor 王明磊张福东李君关辉邵艳丽杨慎佘源琦
Owner PETROCHINA CO LTD
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