Method for extracting oil sample inside hydrocarbon inclusion in groups

Abstract

The invention discloses a method for extracting an oil sample inside hydrocarbon inclusion in groups, which is applied to oil field reservoir stratum rock analysis. The method comprises the steps of washing tools, manufacturing and preparing a rock sample and extracting oil samples from the hydrocarbon inclusions of same period and particularly comprises the steps of: grinding the rock sample into a rock polished sheet with polished double surface and the thickness of 0.2-0.5cm and washing clean; fixing the rock polished sheet in a sample chamber, and adding a mixture liquid of chloroform and methanol into the sample chamber; and drilling up 90-300 hydrocarbon inclusions of the same period under a 35cm focal length objective lens, dissolving the oil in the hydrocarbon inclusions by the mixture liquid of the chloroform and the methanol and completing the oil sample extraction inside the hydrocarbon inclusions of the same period. Tests prove that the invention can satisfy the analysis magnitude of a chromaticness chromatograph, respectively extract the components of the hydrocarbon inclusions of different periods for testing, avoid the phenomenon of union dying of the hydrocarbon inclusions of different periods and guarantee no component loss and no decomposition of the hydrocarbon inclusions in the process of extraction, and has no requirements on the sizes of the hydrocarbon inclusions.

Description

technical field [0001] The present invention relates to the analysis and detection of petroleum rock samples, in particular to the analysis and detection of oil wrapped in different phases of microscopic hydrocarbon inclusions in oilfield reservoir rocks, which is to extract different phases of minerals extracted from rock light sheet inclusions Method for Oil Samples in Hydrocarbon Inclusions. Background technique [0002] Hydrocarbon inclusions are oil and gas sealed in minerals. Hydrocarbon inclusions are sealed in crystal minerals after formation, without contamination by later diagenetic fluids, and completely preserve the components and natural characteristics of ancient oils. Therefore, the study of hydrocarbon inclusions is the The best "specimen" of ancient oil reservoirs. [0003] At present, there are many methods for studying the components of hydrocarbon inclusions, such as infrared spectroscopy, Raman spectroscopy, and particle fluorescence method (Australian ...

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Problems solved by technology

The laser method solves the phenomenon of contamination of hydrocarbon inclusions at different stages, but when the hydrocarbon inclusions are opened by the laser, the laser beam will crack the oil in the hydrocarbon inclusions (mainly the destruction of high-carbon hydrocarbons) and destroy the composition of the oil sample. It brings certain errors to the test; in addition, the individual hydrocarbon inclusions required by the laser method must be large, and the individual individual size is preferably ≥100um, while most oilfield hydrocarbon inclusions are less than 100um, and hydrocarbon inclusions ≥100um are very few , which makes it impossible to use the laser method for many hydrocarbon inclusion components <100um; secondly, the laser method cannot detect its composition by opening a single inclusion. Practice has proved that it is best to open nearly 10-100 hydrocarbon inclusions. The probability of having nearly 100 hydrocarbon inclusions ≥ 100um in a small slice at the same time is too low, which greatly limits the use of this method

[0007] At present, there is no ideal method for extracting oil samples from hydrocarbon inclusions in the world: the components of hydrocarbon inclusions in different periods are extracted separately, without destroying the oil sample components, and meeting the oil sample quality requirements of mass spectrometry.

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