| The research of hydrocarbon generating kinetics of organic matters is an important content in geochemistry.We can rebuild the hydrocarbon generation model and and make scientific evaluation of oil and gas resources based on the thermal simulation experiment of different organic matters.This thesis selects the kerogen of shale from Lucaogou formation,Junggar basin and conduct hydrocarbon generation kinetic simulation experiment with a confine gold autoclave pyrolysis system in anhydrous environment,to recover the hydrocarbon evolution model of sourse rock;By measuring light hydrocarbon components from kerogen pyrolysis products,we investigate the evolution feature of C7 hydrocarbon parameters and carbon isotope with increasing maturity;with the nondestructive and quick analytical method,We measure the Raman spectrum of residual kerogen and fluorescent lifetime of C14+components to analyse the variation of physical property.The main results are as follows:?1?The kerogen of shale was carried out hydrocarbon generation thermal simulation experiment with gold autoclave anhydrous system,acquiring oil and gas accumulation of kerogen evolution model:When Easy%Ro is less than 0.68%,it was poor and inefficienct stage,It is an early stage of kerogen cracking;when Easy%Ro is from 0.681.40%,it is main oil stage.There are two sub-stages,C14+components is the dominant product from kerogen cracking when Easy%Ro is in the range of 0.680.9%,the next stage is generating light oil derived from the cracking of asphalt in the C14+components;when Easy%Ro is from 1.402.17%,it is wet gas stage;when Easy%Ro exceeds 2.17%,it is dry gas stage and The main product is methane from the cracking of C2<sub>5 gas.?2?In the thermal evolution of kerogen hydrocarbon generation,we investigate the characteristic of C7 light hydrocarbon components and carbon isotope.Before C7light hydrocarbon components start cracking,The relative content of different structure components is paraffin>cycloalkanes>aromatic.Mango parameters K1,K2is constant during the thermal evolution which support the steady state catalysis of C7hydrocarbon generation which proposed by Mango.With the increasing of maturity,The content of alkanes is increasing relative to naphthene reflected that the n-heptane and isoheptane values proposed by Thompson increased gradually.The variation of aromaticity ratio and paraffin ratio shows that the samples undergo the thermal maturation.In terms of the isotopes of light hydrocarbons,The carbon isotope ratios of ligut hydrocarbons were stable when Easy%Ro<1.6%.The carbon isotopic of naphthene and benzene are more positive relative to alkane.The carbon isotopic of benzene is constant reveal that it can be used as priority parameter when studing oil-oil correlation.?3?Raman spectroscopy of the residual kerogen from the thermal simulation experiment has two characteristic peaks named D peak at 1350cm-1and G peak at1600cm-1.As the thermal evolution increases,The shape of peaks become narrower and sharper.meanwhile,the shift of D peak decreases and the other keeps constant.When Easy%Ro is in the range of 0.72.0%,the peak separation has a very good linear relation with the Easy%Ro:Easy%Ro=0.0537d?G-D?-11.21.In addition,There is a good negative correlation between half-width of G peak and thermal simulation which shows the D2 peak representing the defects in the surface plane of the graphite layer doesn't influence G peak.The D2 peak is more related to organic matter type than maturity.The raman spectroscopy shows that the structure of organic matter gradually become aromatization with the maturity increasing,so the raman spectroscopy have a potential to be used to evaluate the maturity of organic matter.There is no good correlation between fluorescence life of C14+componengts and thermal simulation demonstrate that it is not suitable to evaluate maturity by fluorescence life.Different C14+groups has different fluorescence life.Saturated hydrocarbons do not have fluorescence and aromatics has the longest fluorescence life. |
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