Petroleum source in the Tazhong Uplift, Tarim Basin: New insights from geochemical and fluid inclusion data

Quantitative analysis of diamondoids in crude oils using gas chromatography–triple quadrupole mass spectrometry

“…These quantities are much more than the total concentrations of diamondoids, including (C 0 -C 5 )-adamantanes and (C 0 -C 3 )-diamantanes, determined by conventional GC-MS, which were 1009 lg/g oil for the TZ261 oil and zero for the TD2 oil (Li et al, 2010). The difference between two quantification results is probably caused by two main factors, i.e., mass loss during sample preparation (i.e., column chromatography separation and solvent evaporation) and the quantitative method.…”

“…Well TZ261 condensate contains abundant diamondoids, while the sample from well TD2 normal oil lacks detectable diamondoids based on conventional GC-MS analysis (Li et al, 2010).…”

Variation in abundance and distribution of diamondoids during oil cracking

“…The abundance and distribution of diamondoids have been measured in highly mature Tarim oils (Chen et al, 1996;Zhang et al, 2005;Li et al, 2010). However, the lack of effective calibrations between diamondoid parameters and maturity of oils limited the application of diamondoid indices.…”

Isotopic compositions and biomarkers in crude oils from the Tarim Basin: Oil maturity and oil mixing

“…The occurrence and formation of marine oils and reservoir bitumen in this basin attracted many geochemists' attention in the past decade due to the long, complex and deep burial geological history of oils Li et al, 2000Li et al, , 2010Zhang et al, 2000Zhang et al, , 2011Sun et al, 2003;Jia et al, 2008Jia et al, , 2010Cai et al, 2009;Pan and Liu, 2009;Yu et al, 2011Yu et al, , 2012. The two old marine oil source units identified in the basin are the Cambrian-Lower Ordovician and Middle-Upper Ordovician strata Zhang et al, 2000).…”

“…The two old marine oil source units identified in the basin are the Cambrian-Lower Ordovician and Middle-Upper Ordovician strata Zhang et al, 2000). Multiple oil generation and filling stages have been proposed as the mechanism of diverse oil formation, e.g., normal, light, waxy and heavy oils occurring in the basin Gong et al, 2007;Wang et al, 2008;Pan and Liu, 2009;Jia et al, 2010;Li et al, 2010;Yu et al, 2011). Many publications documented that there are large variations in the maturity of those oils Pan and Liu, 2009;Yu et al, 2011) and secondary alteration processes also have been reported, including moderate to severe biodegradation (Wang et al, 2008;Pan and Liu, 2009;Jia et al, 2010), and gas washing or migration fractionation resulting in wax precipitation (Ma et al, 1996;Zhang, 2000;Zhang et al, 2011).…”