Saturated hydrocarbons occluded inside asphaltene structures and their geochemical significance, as exemplified by two Venezuelan oils

Multiple-sourced features of marine oils in the Tarim Basin, NW China – Geochemical evidence from occluded hydrocarbons inside asphaltenes

“…Well protected from secondary alteration events, these occluded hydrocarbons represent the original oil derived from kerogen (Liao et al, 2006). A H 2 O 2 /CH 3 COOH oxidative system was used to release occluded hydrocarbons from the asphaltenes (Liao et al, 2005(Liao et al, , 2006Yang et al, 2009;Zhao et al, 2010).…”

“…This paper focuses on the geochemical information from occluded hydrocarbons inside asphaltenes. Well protected from post-depositional alterations by the asphaltene molecular structure, occluded hydrocarbons are thought to represent early oil charged into the reservoirs (Liao et al, 2006). Biomarkers and carbon isotope compositions will be presented in an effort to determine oil-source correlation for the marine oils in the Tarim Basin, NW China.…”

Experimental Studies on the Adsorption/Occlusion Phenomena Inside the Macromolecular Structures of Asphaltenes

“…With the same additives, amounts of n-C 20 D 42 in n-hexane extracts at 240°C were generally lower compared to the groups at 270 and 290°C ( Figure 5). Some values more than 100% in Figure 5 16 The amount of adsorbed n-C 20 D 42 in group D was more than other groups under the same temperature, which may be related to the connection of Ca 2+ among asphaltene molecules (Figure 7). There were similar amounts of n-C 20 D 42 in acetone extracts for groups A−C, which were lower than the control experiment (Table 3 and Figure 7).…”

The Geochemical Characterization of Adsorbed/Occluded Hydrocarbons Inside Solid Bitumen in the Kuangshanliang Area of the Northwestern Sichuan Basin and Its Significance

“…The solid bitumen is often seen to have suffered biodegradation of certain biomarker compounds to some extent. Researches indicate that geological macromolecules such as asphaltene (Liao et al, 2006) and solid bitumen (Cheng et al, 2012) are able to adsorb/occlude other small molecules as the macromolecular structures effectively protect them. This protection reduces the transformative effects of later geochemical processes, thus preserving the earlier organic geochemical information contained in these components.…”

“…The extracted bitumens were then used for oxidative degradation to obtain the occluded compounds inside bitumens, with the details of the procedure followed from Liao et al (2006).…”