Effects of thermal maturation and thermochemical sulfate reduction on compound-specific sulfur isotopic compositions of organosulfur compounds in Phosphoria oils from the Bighorn Basin, USA

Vertical stress history and paleoburial in foreland basins unravelled by stylolite roughness paleopiezometry: Insights from bedding-parallel stylolites in the Bighorn Basin, Wyoming, USA.

“…In order to discuss the timing and the duration of bedding-parallel stylolite development, we projected the range of calculated depths onto the burial models for the eastern and the western parts of the Bighorn basins proposed in Beaudoin et al (2014b) after May et al (2013), based on well data and thermochronology (Figure 6). The validity of this burial-exhumation model is supported by the recent burial models based on organic matter in the basin (Ellis et al, 2017;Gottardi et al, 2019). May et al (2013), Beaudoin et al (2014b)) valid for the western margin of the basin (left-hand side) and for the eastern margin of the basin (right-hand side).…”

Simulation Experiment of TSR Promotes Cracking of Coal Generation H2S

“…The sources of H 2 were mainly polycondensation between free radicals and aromatic structures and polycondensation dehydrogenation reaction of hydrogenated aromatic structures [17][18][19]. The generation of H 2 in the first stage mainly includes hydrogen radicals mainly generated by the oxidation of hydrocarbons by minerals (sulfates) before 400°C, the cracking of long-chain aliphatic hydrocarbons to generate short-chain fatty radicals, and the secondary of light paraffins.…”

The application of compound-specific sulfur isotopes to the oil–source rock correlation of Kurdistan petroleum

“…The organic incorporation of reduced sulfur species is also typically associated with a small isotopic fractionation (usually an enrichment; e.g., Amrani and Aizenshtat, 2004), which can vary for different diagenetic pathways. The  34 S of the organic sulfur in petroleum can be subsequently influenced by thermal maturity (Ellis et al, 2017;Rosenberg et al, 2017) as well as potentially by other common geophysical or chemical impacts on petroleum.…”

“…The  34 S values of individual OSCs in oils or bitumen can now be measured with gas chromatography combined with a multi-collector inductively coupled plasma mass spectrometer (GC-ICPMS; Amrani et al, 2009). The δ 34 S values of thioaromatic and thioadamantane compounds have been measured in a range of oils of different ages and petroleum provinces (Amrani et al, 2009(Amrani et al, , 2012Greenwood et al, 2014;Cai et al, 2015Cai et al, , 2016Gvirtzman et al, 2015;Li et al, 2015;Ellis et al, 2017). The  34 S of the OSCs within and between oils can span a wide range, with values as low as -21‰ detected in Smackover oils (Gulf of Mexico; Gvirtzman et al, 2015) and > +40‰ in thermochemical sulfate reduction (TSR) impacted Tarim Basin oils (NE China; Cai et al, 2015Cai et al, , 2016Greenwood et al, 2015;Li et al, 2015).…”

“…The moderate magnitude of these  34 S BT-DBT values is not indicative of the occurrence of TSR. A recent CSSIA study of a suite of Bighorn Basin oils impacted to varying degrees by TSR was unable to attribute a TSR impact to oils with  34 S BT-DBT  6‰(Ellis et al, 2017). It was intriguing to note the consistently greater  34 S BT-DBT values (by few ‰) of the Kurdistan rocks compared to the Kurdistan oils.…”