High abundance of alkylated diamondoids, thiadiamondoids and thioaromatics in recently discovered sulfur-rich LS2 condensate in the Tarim Basin

Molecular and stable sulfur isotopic (delta S-34) analysis of petroleum recently discovered in the Bachu uplift of the Tarim Basin (China) was conducted to characterize the oil and assist future regional petroleum correlation studies. Sulfur-rich condensate from the Lower Ordovician - Upper Cambrian reservoir rock in the LS2 well showed abundant aromatic hydrocarbons and organic sulfur compounds. Extensive distributions of alkylated caged hydrocarbons (i.e., diamondoids) and caged sulfur compounds (thiadiamondoids), including many additional isomers not previously detected in petroleum, were resolved by GC x GC-MS analysis. The thiadiamondoid products and thioaromatics (i.e., benzothiophenes, dibenzothio-phenes), also detected in LS2, products were attributed to a major thermochemical sulfate reduction (TSR) event, which resulted in elevated H2S (3.66%) and dry gas in the condensate. TSR might also have contributed to the generally heavier delta S-34 values of the benzothiophenes (+26 to +28 parts per thousand) compared to dibenzothiophenes (+20 to +27 parts per thousand). The LS2 reservoir has no sulfate evaporites and the temperature (144 degrees C) is relatively low for TSR, implying that it is a secondary reservoir for migrated TSR-derived gas, possibly derived from deeper and hotter (>200 degrees C) Cambrian strata. (C) 2018 Published by Elsevier Ltd.