Geochemistry of Palaeozoic marine petroleum from the Tarim Basin, NW China. Part 2: Maturity assessment

被引:140
作者
Zhang, SC
Huang, HP
Xiao, ZY
Liang, DG
机构
[1] Univ Calgary, Dept Geol & Geophys, Calgary, AB T2N 1N4, Canada
[2] China Natl Petr Corp, Key Lab Petr Geochem, Beijing 100083, Peoples R China
[3] PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
[4] China Univ Geosci, Sch Energy Resource, Beijing 100083, Peoples R China
[5] PetroChina Tarim Oil Co, Explorat & Dev Inst, Kuerle 84100, Xinjiang, Peoples R China
关键词
D O I
10.1016/j.orggeochem.2005.01.014
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The thermal maturity of forty three crude oil samples collected from the cratonic portion of the Tarim Basin, NW China has been assessed using a variety of parameters. While compound ratios of diamondoids, alkylated naphthalenes, methyl phenanthrenes and methyl dibenzothiophenes showed consistent trends with increasing maturity, a large discrepancy was observed for the maturity levels of the oils determined from these parameters. Equivalent vitrinite reflectance values calculated from methylphenanthrene index 1 (MPI1), methyldibenzothiophene ratio (MDR) and methyldiamontane index (MDI) were in the range of 0.66-0.97%, 1.11-1.64% and 0.89-1.74% Ro, respectively. While we caution that some of the discrepancy may be related to calibration problems, the difference observed from different compound classes could be real, reflecting the multiple charge to petroleum accumulations, as the diamondoid hydrocarbons were possibly generated at later maturation stages than most aromatic hydrocarbons. As diamondoids with methyl substitution on the bridgehead positions are more stable than those with substitution on other positions, several compound ratios based on ethyl admantanes, dimethyl admantanes, trimethyl admantanes and dimethyl diamantanes also correlated with the established maturity indicators such as MDR and MDI. While condensates with high maturity levels represent the late charge hydrocarbons, some of them with relatively low maturity levels may be affected by evaporative fractionation processes. The normal gravity oils cover a wide maturity range, consistent with multiple charges and in-reservoir mixing. While the waxy oils with high apparent maturity levels may be the products of wax precipitation due to a later gas injection into an oil column, heavy oils with low apparent maturity levels could be the residue of oil that has lost its light end. (c) 2005 Published by Elsevier Ltd.
引用
收藏
页码:1215 / 1225
页数:11
相关论文
共 35 条
[1]   THE EFFECTS OF THERMAL MATURITY ON DISTRIBUTIONS OF DIMETHYLNAPHTHALENES AND TRIMETHYLNAPHTHALENES IN SOME ANCIENT SEDIMENTS AND PETROLEUMS [J].
ALEXANDER, R ;
KAGI, RI ;
ROWLAND, SJ ;
SHEPPARD, PN ;
CHIRILA, TV .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1985, 49 (02) :385-395
[2]   ALKYLATED PHENANTHRENE DISTRIBUTIONS AS MATURITY AND ORIGIN INDICATORS IN CRUDE OILS AND ROCK EXTRACTS [J].
BUDZINSKI, H ;
GARRIGUES, P ;
CONNAN, J ;
DEVILLERS, J ;
DOMINE, D ;
RADKE, M ;
OUDIN, JL .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1995, 59 (10) :2043-2056
[3]   Distribution of alkylated dibenzothiophenes in petroleum as a tool for maturity assessments [J].
Chakhmakhchev, A ;
Suzuki, M ;
Takayama, K .
ORGANIC GEOCHEMISTRY, 1997, 26 (7-8) :483-489
[4]   Diamondoid hydrocarbon ratios: Novel maturity indices for highly mature crude oils [J].
Chen, JH ;
Fu, JM ;
Sheng, GY ;
Liu, DH ;
Zhang, JJ .
ORGANIC GEOCHEMISTRY, 1996, 25 (3-4) :179-190
[5]   Diamondoid hydrocarbons as indicators of natural oil cracking [J].
Dahl, JE ;
Moldowan, JM ;
Peters, KE ;
Claypool, GE ;
Rooney, MA ;
Michael, GE ;
Mello, MR ;
Kohnen, ML .
NATURE, 1999, 399 (6731) :54-57
[6]   MATURATION EFFECTS ON ABSOLUTE BIOMARKER CONCENTRATION IN A SUITE OF COALS AND ASSOCIATED VITRINITE CONCENTRATES [J].
DZOU, LIP ;
NOBLE, RA ;
SENFTLE, JT .
ORGANIC GEOCHEMISTRY, 1995, 23 (07) :681-697
[7]   Biomarker maturity parameters:: the role of generation and thermal degradation [J].
Farrimond, P ;
Taylor, A ;
Telnæs, N .
ORGANIC GEOCHEMISTRY, 1998, 29 (5-7) :1181-1197
[8]  
GRAHAM SA, 1990, AAPG BULL, V74, P493
[9]  
Hanson AD, 2000, AAPG BULL, V84, P1109
[10]   Dynamics for multistage pool formation of Lunnan low uplift in Tarim Basin [J].
He, DF ;
Jia, CZ ;
Liu, SB ;
Pan, WQ ;
Wang, SJ .
CHINESE SCIENCE BULLETIN, 2002, 47 :128-138