Geoscience ›› 2011, Vol. 25 ›› Issue (3): 599-607.
• Water Resource and Environment • Previous Articles Next Articles
MO Zhong-Hua-1, 2 , LI Su-Mei-1, 2
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Abstract:
Nanpu oilfield is a recently discovered field with substantial petroleum reserves. Totally 43 oils and 31 rock samples were collected for performing detailed geochemical analyses to unravel the characteristics and oil source for the oils. Three oil families have been recognized according to biomarkers and compound specific carbon isotope of nalkanes, namely Tertiary oils in No1 and 2 structural belts (OFⅠ), Tertiary oils in No3, 4 and 5 structural belts (OFⅡ) and Ordovician oils (OFⅢ). The OFⅠ is characterized by relatively low ratios of diasteranes to regular steranes but high ratios of steranes to hopanes, 4methyl steranes to C29 regular steranes and gammacerane to C30 hopane with a little heavier δ13C values of the compound specific isotope of nalkanes relative to the OFⅡ. The OFⅢ is distinguished from both the OFⅠ and OFⅡ with relatively higher thermal maturity and heavier δ13C values of nalkanes. Detailed oilsource rock correlation showed that the OFⅡ and OFⅢ were mainly derived from the source rocks of Ed3-Es1 and Es2+3 respectively, and the OFⅠ was derived from both the Es2+3 and Ed3-Es1 source rocks. We suggested that the Es2+3 is one of the most important source rocks of the Tertiary oils in the Nanpu oilfield, which is different from the previous idea that only the Ed3-Es1 is responsible for the Tertiary oils. This study should be helpful to petroleum resources evaluation and further petroleum exploration of the Nanpu oilfield.
Key words: Nanpu oilfield, biomarker, compound specific isotope, oil genetic type, oilsource rock correlation
MO Zhong-Hua-1, 2 , LI Su-Mei-1, 2. Characteristics and Oilsource Investigation of the Oils in the Nanpu Oilfield, Bohai Bay Basin[J]. Geoscience, 2011, 25(3): 599-607.
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