Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (3): 356-362.doi: 10.11743/ogg20060310

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Problems of oil-source correlation for marine reservoirs in Paleozoic craton area in Tarim basin and future direction of research

Ma Anlai, Jin Zhijun, Wang Yi   

  1. Research Institute of Petroleum Exploration & Production, SINOPEC, Beijing 100083
  • Received:2006-03-30 Online:2006-06-25 Published:2012-01-16

Abstract:

Understanding of the major source rocks of oil in marine reservoirs in the Paleozoic craton area is always a controversial issue because of the high mature to overmature Cambrian source rocks and the limited distribution of the encountered Upper Ordovician Lianglitage Formation source rocks.Based on study of the geochemical behaviors of oils,it is believed that the oil in marine reservoirs is mainly of oil generated during oil generating peak to late generating stage.There is an obvious difference between the oil and the maturity of Cambrian source rocks,the basin is characterized by multistage reservoiring of oils generated by multiple sets of source rocks,and the oils have experienced secondary alteration,therefore the use of biomarkers for oil-source correlation is restricted in the Paleozoic craton area.Future study should be focused on the evolutionary pattern of specific biomarkers of the Upper Ordovician Lianglitage Formation source rocks that are now in the range of "oil-window" stage and the thermal evolution of Lower Paleozoic source rocks.

Key words: oil-source correlation, source rock, biomarker, Cambrian, Ordovician, Tarim basin

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