塔里木盆地麦盖提斜坡罗斯2井奥陶系油气藏的TSR作用:来自分子标志物的证据

doi:10.11743/ogg20180410

Abstract

Abstract:

The study made a quantitative analysis of diamondoid, dibenzothiophenes and thiadiamondoid series in the crude oil from Well Luosi-2 via the GC-MS method with internal standards.The concentrations of diamondoid and 4-+3-methyldiamantane(4-+3-MD)are 10818 and 331 g/g in the study area,suggesting that the crude oil suffered serious cracking and the proportion of cracking oil is up to about 90%.The diamondoid indexes show that the maturity of crude oil from Well Luosi-2 is above 1.6% R_c.Complete thiaadamantane,thiadiamantane,thiatriamantane series were detected from the Well Luosi-2 crude oil,with the contents of thiadiamondoid,thiaadamantane,thiadiamantane,thiatriamantane being 192,160,26 and 6 μg/g respectively.The high concentration of thiadiamondoid is a sign that the degree of thermochemical sulfate reduction(TSR)of oil from Well Luosi-2 is higher than that of most crude oil from the Lower Ordovician Yingshan Formation in Tazhong uplift.TSR results in the higher DBTs, about 8 201 μg/g,in the oil from Well Luosi-2, and in turn the higher ratios of DBT/P,C₀-/C₁-DBT and C₁-/C₂-DBT.

Key words: thiadiamondoid, diamondoid, dibenzothiophene, thermochemical sulfate reduction(TSR), Well Luosi-2, Tarim Basin

CLC Number:

TE135

Ma Anlai, Jin Zhijun, Zhu Cuishan, Gu Yi, Li Huili, Lu Qinghua. Effect of TSR on the crude oil in Ordovician reservoirs of Well Luosi-2 from Maigaiti Slope,Tarim Basin: Evidences from molecular markers[J]. Oil & Gas Geology, 2018, 39(4): 730-737,748.

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Effect of TSR on the crude oil in Ordovician reservoirs of Well Luosi-2 from Maigaiti Slope,Tarim Basin: Evidences from molecular markers

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