Method and device for analyzing light fraction compounds in petroleum hydrocarbon source rock

Abstract

The invention relates to an analyzing method of light distillate compounds in petroleum hydrocarbon source rocks and a device thereof. The analysis of the light distillate compounds that are contained in organic matters dispersing in the hydrocarbon source rocks is implemented in a liquid nitrogen freezing and impact crushing device and a sealed heating and online chromatogram sampling and analyzing device. A rock sample is quickly crushed into powder by an impact hammer in a liquid nitrogen freezing sample container, the sample powder is hermetically heated, the organic matters dispersing in the sample is thermally desorbed and blown into a liquid nitrogen cold trap in a chromatogram oven by helium gas, the cold trap is taken down after the thermal desorption is finished, and a chromatogram analyzing program is started, wherein, the largest diameter of analyzed samples can reach 2cm, the feeding amount of the liquid nitrogen is 7ml, the emptying time is 90sec, the thermal desorption temperature is 200 DEG C, and the homothermal time lasts for 10 minutes. The analyzing method of the light distillate compounds in the petroleum hydrocarbon source rocks does not have light distillate loss, and can obtain the chromatogram peak of hydrocarbon substances that have carbon number greater than C5, consistent separating effect with the analyzing effect of high-quality crude oil light distillates, straight chromatogram baseline, and good reproducibility of the chromatogram peak.

Description

technical field [0001] The invention relates to a method for freezing, impact crushing, thermal analysis, helium purging chromatographic on-line sampling analysis of light fraction compounds of residual hydrocarbons in petroleum source rocks and equipment thereof. Background technique [0002] The various hydrocarbon contents usually mentioned in petroleum geology, such as free hydrocarbons, pyrolysis hydrocarbons, hydrocarbon production potential, etc., refer to residual hydrocarbons in source rocks, light fractions in crude oil (C 5 -C 13 ) is a very important component, for light oil and condensate oil, C 5 -C 13 Fractions account for more than 90% of the total oil quality, and are undoubtedly representative. The geochemical information contained in them cannot be ignored. There have been many research results at home and abroad. Corresponding to the research item of light fractions of crude oil, research on light fractions of compounds in dispersed organic matter of s...

AI Technical Summary

Problems solved by technology

The domestic Sinopec Wuxi Central Laboratory has launched a complete set of equipment "WX-2001 Cuttings Sealed Cutting Extractor", which uses Freon to extract source rocks, volatilize and concentrate, and then conduct chromatographic analysis. 6 -C 32 The results of chromatographic analysis of hydrocarbon composition. This method uses freon extraction, so there are environmental problems; the device for analyzing light hydrocarbons in rocks at the Langfang Branch of the China Petroleum Exploration and Development Research Institute is a combination of a pyrolysis device produced by Australia's SGE company and a HP5890A gas chromatograph. It is carried out on-line in phase connection, and the effect is very good. The main problem is that the large rock sample needs to be crushed into a diameter of about 4mm before sample injection. The crushing process is prone to loss of light hydrocarbons, and the sample size is small; Daqing Oilfield Research Institute The rock sample is sealed and crushed, and the adsorbed hydrocarbons in the rock sample are collected by the method of drainage and gas extraction, and then chromatographic analysis is carried out

Images