Title: COMPARATIVE RESEARCH ON MATURITY FEATURE AND MATURITY INDICATOR OF COAL SOURCE ROCK FROM WEST SICHUAN BASIN DEPRESSION
Abstract: The degree of thermal evolution of source rocks is an important criterion to determine oil-generating capacity for a basin.However,there are a lot of quantitative criteria for the determination of thermal evolution.This article is based on the research of 17 specimens from 4 major hydrocarbon source rocks of J1z,T3x5,T3x3 and T3t,sampled from LS1 wells of Longquanyi in West Sichuan Depression.It is showed that the vitrinite reflectance of source rock ranges from 0.97 to 1.59,Tmax has an average value of 488.67,ROMPI1 is between 1.01 ~ 1.56,RO(3-MCH/1-MCH) values ranged from 1.05 to 1.57.All of the data show that this area belongs to mature to high mature hydrocarbon source rocks.The trend of aromatic hydrocarbon indicators is clearly increasing with depth,especially,the MPI1 and 3-MCH/1-MCH changes with depth more apparently,similar to the change of RO with depth.However,the MDBI index and (4-MDBT/1-MDBT) have a poor correlation with the depth.But generally,it shows a gradual in increasing tendency.Comparative study of maturity index confirmed that vitrinite reflectance is an indicator for the horizontal correlation of maturity.Aromatics color quality parameters of MPI1 and 3-MCH/1-MCH are less susceptible to the effects of various diagenetic environments,and thus are potential indicators for the determination of maturity.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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Cited By Count: 1
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