Method for quantitatively characterizing occurrence characteristics of shale oil
A technology for quantitative characterization and shale oil, applied in measurement devices, instruments, and analysis by nuclear magnetic resonance, etc., can solve problems such as difficulty in shale oil distribution and quantitative evaluation, and achieve the effect of convenient geological popularization and application and strong practicability
Pending Publication Date: 2021-01-08
CHINA PETROLEUM & CHEM CORP +1
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Although nuclear magnetic resonance technology has been widely used to distinguish different types of fluids in conventional reservoirs, since shale oil is distributed in complex pore spaces, the occurrence state is controlled by complex factors, which leads to the direct use of nuclear magnetic resonance technology for shale oil distribution and quantitative evaluation. There are difficulties
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[0055]According to the method of the present invention, quantitative characterization of shale oil occurrence characteristics is carried out on shale oil cores from Wangchang area of Jianghan Basin. Steps likefigure 1 Shown. specifically,
[0056](1) Take fresh cores stored at low temperature (-18℃) for more than 72 hours, drill a plunger core sample with a diameter of 2.54 cm and a length of 3.0 cm, and use the echo interval of TE = 0.1 to measure the original state and self-absorption of the plunger sample Saturated oil state, pressurized saturated oil state (500psi, 1000psi, 2000psi) NMR T2 spectrum distribution measurement, the measurement results are as followsfigure 2 Shown.
[0057](2) Take a fresh core sample with a mass of 100g stored at a low temperature (-18°C) for more than 72 hours, and crush the frozen sample under liquid nitrogen cooling to a particle size between 0.07mm and 0.15mm. Using the echo interval of TE=0.1, the T2 spectrum distribution of the original state of t...
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Abstract
The invention belongs to the field of unconventional oil and gas exploration and development, and relates to a method for quantitatively characterizing occurrence characteristics of shale oil. The method comprises the following steps: respectively drilling column samples and grinding crushed samples by utilizing fresh shale cores preserved at low temperature; then, carrying out nuclear magnetism T2 measurement on the original state, self-absorption oil and pressurized saturated oil state of the column sample; then, carrying out a nuclear magnetic resonance and pyrohydrocarbon joint measurementexperiment after multi-temperature-stage heating in an original state of the crushed sample, and determining nuclear magnetic T2 distribution and (residual) pyrohydrocarbon content after different heating temperatures; and finally, analyzing and determining the light hydrocarbon loss amount of the oil-bearing shale, the content of the heat release hydrocarbon of each temperature stage when the light hydrocarbon is not lost and the distribution position of the shale oil component T2 in different occurrence states according to a nuclear magnetic resonance and multi-temperature-stage heat release hydrocarbon joint measurement experiment result, thereby realizing nuclear magnetic quantitative characterization of the shale oil occurrence characteristics. The method is high in operability and practicability and convenient for geological popularization and application.
Description
Technical field[0001]The invention belongs to the field of unconventional oil and gas exploration and development, and more specifically, relates to a method for quantitatively characterizing the occurrence characteristics of shale oil.Background technique[0002]Shale is both a source rock and a reservoir, with typical "self-generation and self-storage" accumulation characteristics, complex storage space, and special fluid occurrence characteristics. The quantitative characterization of shale oil fluid distribution and content is an important basis for unconventional shale oil reservoir effectiveness evaluation, reserve calculation and productivity prediction.[0003]At present, the research on the occurrence characteristics of shale oil fluids mainly includes the following three methods.[0004]The first type is the organic solvent extraction method represented by "chloroform pitch A". This type of method is difficult to distinguish between free and adsorbed shale oil. At the same time,...
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IPC IPC(8): G01N24/08
CPCG01N24/081Y02A90/30
Inventor 路菁李军南泽宇张爱芹邹友龙苏俊磊胡瑶
Owner CHINA PETROLEUM & CHEM CORP