Sequential extraction and compositional analysis of oil-bearing fluid inclusions in reservoir rocks

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The free oils, adsorbed oils and oil-bearing fluid inclusions have been extracted separately and analyzed by GC and GC-MS in reservoir rock samples collected from the Kuche Depression. The results demonstrate that the molecular compositions of oil-bearing fluid inclusions are significantly different from those of the free oils (the current oils). Compared with the current oil, the oil-bearing fluid inclusions are characterized by relatively high values of parameters Pr/nC17 and Ph/nC18, low values of Pr/Ph, hopanes/steranes, C30-diahopane/C30-hopane and Ts/Tm, low content of C29Ts terpane and high maturities as indicated by C29 steranes 20S/(20R+20S). In addition, the oil-bearing fluid inclusions correlate very well with the oils in northern and central Tarim Basin, which were derived from Cambrian-Ordovician marine source rocks. The adsorbed oils appear to be an intermediate type between free oils and oil-bearing fluid inclusions. The above analytical data indicate that there are at least two oil-charg The free oils, adsorbed oils and oil-bearing fluid inclusions have been extracted and analyzed by GC and GC-MS in reservoir rock samples collected from the Kuche Depression. The results demonstrates that the molecular compositions of oil-bearing fluid inclusions are significantly different Compared with the current oil, the oil-bearing fluid inclusions are characterized by relatively high values ​​of parameters Pr / nC17 and Ph / nC18, low values ​​of Pr / Ph, hopanes / steranes , C30-diahopane / C30-hopane and Ts / Tm, low content of C29Ts terpane and high maturities as indicated by C29 steranes 20S / (20R + 20S). In addition, the oil-bearing fluid inclusions correlate very well with the oils in northern and central Tarim Basin, which were derived from Cambrian-Ordovician marine source rocks. The adsorbed oils appear to be an intermediate type between free oils and oil-bearing fluid inclusions. The above analytical data indicates that there are at l east two oil-charg
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