Xinjiang Petroleum Geology

Xinjiang Petroleum Geology ›› 2008, Vol. 29 ›› Issue (1): 53-56.

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Hydrocarbon Expulsion History of Middle-Upper Ordovician Source Rocks in Tarim Basin

LIANG Ze-liang1, GANG Wen-zhe2, YE Zhi-xu3   

  1. 1. Institute of Geophysics, Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Urumqi, Xinjiang 830013, China;
    2. China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Exploration and Development, Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063000, China
  • Received:2007-03-14 Published:2020-08-10

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Abstract: The Middle-Upper Ordovician source rocks are one of the main marine source rocks in Tarim basin. This paper studies the spatial distribution and the geological and geochemical characteristics in the Middle-Upper Ordovician source rocks, estimates the hydrocarbon expulsion efficiency of them by adsorption model and develops the model for simulating the hydrocarbon expulsion history of such source rocks, obtaining the intensity and the quantity of hydrocarbon expulsion of them in each geological history time. The oilexpelled quantity and gas-expelled quantity are estimated by 325.10×108t and 610.25×1011m3, respectively, totaling about 811.35×108t in hydrocarbon expulsion quantity. The main hydrocarbon expulsion time for calcareous source rocks is in the Middle-Late Ordovician and the Silurian-Triassic, centering in uplift of north sag, Tazhong (central Tarim) uplift, southern Bachu uplift and partial area of Maigaiti slope; the hydrocarbon expulsion center for muddy source rocks is mainly in Manjiaer sag and Awati sag.

Key words: Tarim basin, Middle Ordovician, Upper Ordovician, source rock, hydrocarbon expulsion quantity, intensity

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