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دانلود رایکان مقاله انگلیسی ISI با موضوع همبستگی منشا – نفت پالازوئیک در حوضه تاریم

عنوان فارسی مقاله:

همبستگی منشا – نفت پالازوئیک در حوضه تاریم، NW چین: یک مرور

عنوان انگلیسی مقاله:

Palaeozoic oil–source correlation in the Tarim Basin, NW China: A review

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5. Conclusions

The Є–O1 source rocks are organic rich with high thickness and are currently over mature, while effective source rocks in the O2–3 strata are moderately matured and they are organic poor with a limited distribution. Various techniques have been applied in oil–source correlation including distributions of n-alkanes, biomarkers, polycyclic aromatic hydrocarbons, bulk and individual hydrocarbon carbon isotopic compositions, bulk and individual dibenzothiophene sulfur isotopic compositions, sequential extraction and asphaltene pyrolysis. All studies suggest that the oils in the cratonic region of the Tarim Basin are mixtures of two source rock systems, however, the criteria of differentiation and proportion from each end-member are controversial. Many older studies suggest that oils are overwhelmingly derived from the O2–3 source rocks with only a few samples bearing the Є–O1 source characteristics, while more recent studies emphasize a greater contribution from Є–O1 source rocks. The root cause for this controversy is the injudicious selection of end-members that has impeded robust oil–source correlation. TD2 oil, widely used as an end-member for the Cambrian, has lost its original signature due to an abnormally high thermal stress. Some biomarker variations such as sterane distribution, gammacerane index and ratio of tricyclic/ pentacyclic terpanes are closely related to thermal maturation and biodegradation. In addition, the even/odd predominance of n-alkanes, unusually enriched d13C values, occurrence of combustion related PAHs most likely resulted from igneous intrusion and hydrothermal fluid influences. TSR also exerts significant impacts on local oil compositions. All these factors need to be properly accounted for before the contribution from the Cambrian strata can appropriately be assessed.