Xinjiang Petroleum Geology ›› 2004, Vol. 25 ›› Issue (5): 474-478.

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Petroleum System of Mesozoic in Qiangtang Basin

WU Xin-he1, WANG Cheng-shan2, HU Jian-hong3, YI Hai-sheng1,2   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. State Key Laboratory of Hydrocarbon Reservoir Geology and Development Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    3. Oriental Geophysical Prospecting Co., Ltd, PetroChina, Zhuozhou, Hebei 072751, China
  • Received:2004-02-06 Revised:2004-06-29 Published:2021-01-13

Abstract: Qiangtang basin lies in mid-segment of Tethys domain in north-central Qinghai-Tibet plateau, which is a complex and special type of compound symmetric foreland basin with Tethy an tectonic style from Late Paleozoic to Mesozoic. It has widespread Mesozoic marine depo-sition and the latest marine strata with thickness of over 10,000 meters. W ell-developed and widespread source rocks with the max. thickness of more than 3,000 m are found in Mesozoic Qiangtang basin, where Xiaochaka formation (T3x) of Upper Trassic and Buqu formation (J2b) andXili formation (J2x) of Middle Jurassic are good in organic matter type and abundance as well as buried condition and distribution from matureto overmature in organic matter maturity. And it is one of major source of hydrocarbons in Qiangtang basin. This paper analyzed and classified in detail the petroleum systems such as T3x-J1q, J2q-J2b and J2x-J3s in Qiangtang basin.

Key words: Tibet, Qiangtang basin, petroleum system, source rock

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