Comparison of Geochemistry Character between Mudstones from Deep Lacustrine Facies and Coal Measures by Hydrous Pyrolysis

LIANG Chun-xiu; WEI Zhi-ping; MAO Chao-lin; LI Ben-cai

The geochemistry characters are discussed which between mudstones from deep lacustrine facies and coal measured by hydrous pyrolysis.Lots of differences of the two samples are pointed out by analysis.The mudstones from deep lacustrine facies and coal measure show difficult evolution features by hydrous pyrolysis. The mudstone from deep lacustrine facies has high hydrocarbon yield and is more profitable to liquid oil generation,so it will mainly generate liquid oil in the course of thermal evolution.The saturated hydrocarbon content is more and the nonhydrocarbon content is lower in the residual dissoluble organic matter in the mudstone from deep lacustrine facies than that in coal measures.The ratio of resin to asphalten and the ratio of saturated hydrocarbon to aromatics increase when the temperature rises in the mudstone from deep lacustrine facies.The ratio of resin to asphalten increases and the ratio of saturated hydrocarbon to aromatics varies little or decreases a little when the temperature rises in the mudstone from coal messures. T _max of the pyrolyzed(Rock-Eval) mudstones from deep lacustrine facies can not indicate evolution stage,but T _max of the pyrolyzed(Rock-Eval) mudstones from the mudstone from coal measures increases as the temperature rises.The carbon isotope of kerogen from the mudstone from deep lacustrine facies is lower distinctly than that of kerogen from mudstone of coal measures. The carbon isotope of kerogen from two samples becomes heavy as the temperature rises.It is obvious that the T _max of the mudstone from deep lacustrine facies should be considered carefully when it is used to rekon the maturity of organic matter,and that the variation of isotope carbon of kerogen should also be thought much when it is used to research the type of organic matter.

1 Chengdu Science and Engeneering University,Chengdu 610059;

2 Jilin Petroleum Exploration and Development Institute, SongYuan, Jilin 138001

Received Date: 2001-02-13

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Abstract: The geochemistry characters are discussed which between mudstones from deep lacustrine facies and coal measured by hydrous pyrolysis.Lots of differences of the two samples are pointed out by analysis.The mudstones from deep lacustrine facies and coal measure show difficult evolution features by hydrous pyrolysis. The mudstone from deep lacustrine facies has high hydrocarbon yield and is more profitable to liquid oil generation,so it will mainly generate liquid oil in the course of thermal evolution.The saturated hydrocarbon content is more and the nonhydrocarbon content is lower in the residual dissoluble organic matter in the mudstone from deep lacustrine facies than that in coal measures.The ratio of resin to asphalten and the ratio of saturated hydrocarbon to aromatics increase when the temperature rises in the mudstone from deep lacustrine facies.The ratio of resin to asphalten increases and the ratio of saturated hydrocarbon to aromatics varies little or decreases a little when the temperature rises in the mudstone from coal messures. T _max of the pyrolyzed(Rock-Eval) mudstones from deep lacustrine facies can not indicate evolution stage,but T _max of the pyrolyzed(Rock-Eval) mudstones from the mudstone from coal measures increases as the temperature rises.The carbon isotope of kerogen from the mudstone from deep lacustrine facies is lower distinctly than that of kerogen from mudstone of coal measures. The carbon isotope of kerogen from two samples becomes heavy as the temperature rises.It is obvious that the T _max of the mudstone from deep lacustrine facies should be considered carefully when it is used to rekon the maturity of organic matter,and that the variation of isotope carbon of kerogen should also be thought much when it is used to research the type of organic matter.

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Reference (8)

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[2]	张文正,关德师著.液态烃分子系列碳同位素地球化学[M].北京:石油工业出版社,1997
[3]	高岗.富硫泥灰岩油气生成模拟研究[J].石油大学学报,2000,24(1):34～37
[4]	王新洲,宋一淘,王学军.石油成因与排油物理模拟-方法、机理即应用[M].山东东营:石油大学出版社,1996
[5]	Lewan M D.,Winters A,Williams J.Generation of oil-like pyrolyzates from organic-rich mudstones[J].Science,1979,203:897～899
[6]	Rowland S J.Hydrous pyrolysis of sediments composition and proportions of aromatic hydrocarbons in pyrolysates[J].Advances in Organic Geochemistry,1985,10:1 033～1 040
[7]	石卫,郭绍辉,秦匡宗.烃源岩在水介质下热压模拟的初步研究[A].第五届全国有机地球化学会议论文集[C].南京:江苏科学出版社,1994.381～386
[8]	夏新宇,张文正.热压模拟实验的动力学研究及意义[J].石油勘探与开发,2000,27(5):22～26

Comparison of Geochemistry Character between Mudstones from Deep Lacustrine Facies and Coal Measures by Hydrous Pyrolysis

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