Oil & Gas Geology ›› 2004, Vol. 25 ›› Issue (3): 263-267.doi: 10.11743/ogg20040305

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Two types of Cambrian source rocks and related petroleum systems in Tarim basin

Yang Wei1, Wei Guoqi1, Wang Qinghua2, Xiao Zhongyao2   

  1. 1. Langfang Branch of Petroleum Exploration and Development Research Institute, PetroChina, Langfang, Hebei;
    2. Tarim Oilfield Company, PetroChina, Korla, Xinjiang
  • Received:2004-01-14 Online:2004-06-25 Published:2012-01-16

Abstract:

Cambrian source rocks,including mud shales and carbonates,are among the main source rocks in Tarim basin.The mud shales,developed in an under-compensation environment,are mainly distributed in the eastern part of the basin and have an average TOC of 1.87% and an effective thickness ranging from 120m to 415m;while the carbonates,developed in an intra-platform evaporative lagoonal environment,are mainly distributed in the western part of the basin and have an average TOC of 0.42% and an effective thickness between 288m and 324m.The two types of source rocks gave rise to different petroleum systems.The hydrocarbon generating center of the petroleum system with basin facies mud shales to be the source rocks,was located in Manjiaer sag,and the reservoirs are mainly Cambrian-Ordovician carbonates and Silurian,Carboniferous,Triassic and Jurassic sandstones;while that of the petroleum system with the platform facies carbonates to be the source rocks might be located in Bachu high and the surrounding area,and the reservoirs are mainly Lower Ordovician and Carboniferous.

Key words: Cambrian, source rock, mud shale, carbonates, petroleum system

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