GeochemicalCharacteristics ofOil Sand Extracts in Different State from Sandstone Reservoirs: Ⅱ long chain alkyl benzenes: a case study from Yanchang Formation of Triassic in Ordos basin

ZHAO Xin; SHI Ji-an; WANG Jin-peng; WANG Qi; LU Long-fei; WANG Lei; WANG You-xiao

Saturated hydrocarbon fractions of free oil, sealing oil and bound oil, which are extracted from six oil sands of Yanchang Format ion in Xifeng oilfield of northw estern Ordos Basin, North west China, have been analyzed by GC /MSD( 6890N /5973N ) in order. The long chain alkyl benzenes in six samples show an even carbon number predominance rang ing from C₁₆ to C₂₀ in carbon number. Our study show s thatmaturity has an effect on the evo lution of long chain alkyl benzenes, that is, with the increase of maturity, the carbon number distribution of alkyl benzenes shifts to the lower homologues isomers; relative abundance of alky lbenzenes isomeride decreases, whereas n-alky benzenes increase.Long chain alkyl benzenes is the product of cyclization-decarboxy lation-aromatization of fatty acid, with the help of claym inerals catalytic effect, which comes from bacteria, seaseed and higher plant lipid; or the reaction product ofmonocy licarom atics and fatty acid alkyl group under the same conditions. The formed long and linear chain alkyl benzene changes into benzene methy l and alkene through B-sc ission andmonomo lecular homo lysis, and then benzenemethyl shifts to the position of A-Carbon in the long cha in alkyl benzene through H-transfers. The finding of long chain alkyl benzene proves the relatively strong reducing environments during deposit ion at that time. The distribution character istics of long chain alkyl benzene in different state hydrocarbon can be used for petroleum accumulation dating.

GeochemicalCharacteristics ofOil Sand Extracts in Different State from Sandstone Reservoirs: Ⅱ long chain alkyl benzenes: a case study from Yanchang Formation of Triassic in Ordos basin

1. Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000;

2. School of Earth Science and Land Resources, Chang'an University, Xi'an 710054;

3. Graduate school of Chinese Academy of Sciences, Beijing 100039

Received Date: 2004-08-17

Rev Recd Date: 2004-12-09

Publish Date: 2005-09-10

Key words:

Abstract: Saturated hydrocarbon fractions of free oil, sealing oil and bound oil, which are extracted from six oil sands of Yanchang Format ion in Xifeng oilfield of northw estern Ordos Basin, North west China, have been analyzed by GC /MSD( 6890N /5973N ) in order. The long chain alkyl benzenes in six samples show an even carbon number predominance rang ing from C₁₆ to C₂₀ in carbon number. Our study show s thatmaturity has an effect on the evo lution of long chain alkyl benzenes, that is, with the increase of maturity, the carbon number distribution of alkyl benzenes shifts to the lower homologues isomers; relative abundance of alky lbenzenes isomeride decreases, whereas n-alky benzenes increase.Long chain alkyl benzenes is the product of cyclization-decarboxy lation-aromatization of fatty acid, with the help of claym inerals catalytic effect, which comes from bacteria, seaseed and higher plant lipid; or the reaction product ofmonocy licarom atics and fatty acid alkyl group under the same conditions. The formed long and linear chain alkyl benzene changes into benzene methy l and alkene through B-sc ission andmonomo lecular homo lysis, and then benzenemethyl shifts to the position of A-Carbon in the long cha in alkyl benzene through H-transfers. The finding of long chain alkyl benzene proves the relatively strong reducing environments during deposit ion at that time. The distribution character istics of long chain alkyl benzene in different state hydrocarbon can be used for petroleum accumulation dating.

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GeochemicalCharacteristics ofOil Sand Extracts in Different State from Sandstone Reservoirs: Ⅱ long chain alkyl benzenes: a case study from Yanchang Formation of Triassic in Ordos basin

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