Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (5): 594-603.doi: 10.11743/ogg20060503

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A discussion on the relationship between tectonization and hydrocarbon accumulation and dissipation in the platform-basin transitional area of Tarim basin

Pang Xiongqi, Gao Jianbo, Meng Qingyang   

  1. 1. Basin & Reservoir Research Center, China University of Petroleum, Beijing 102249;
    2. Key Laboratory of Hydrocarbon Accumulation, Ministry of Education China University of Petroleum, Beijing 102249
  • Received:2005-04-26 Online:2006-10-25 Published:2012-01-16

Abstract:

The effect of tectonization in different periods on the accumulation and dissipation of hydrocarbons in different reservoirs varies in different accumulation periods.The accumulation mechanism and distribution pattern of hydrocarbons also vary in different reservoirs in different accumulation periods.For the early primary Ordovician reservoirs formed in the second accumulation period,hydrocarbons were prone to accumulate in superimposed area of relatively weak tectonization with an average erosion rate of 2.5-3.5m/50Ma due to alternate differential subsidence and great erosion rate.For the late primary Carboniferous reservoirs formed in the third accumulation period,hydrocarbons were prone to accumulate in low uplift and slope zones with an average erosion rate of 1.0-2.5m/50Ma,rather than in structural high,due to multiple tectonization and erosion resulted from the successive paleohigh in the basin For the late primary Carboniferous reservoirs formed in the fourth accumulation period,some hydrocarbons accumulated in the structural high because of the existence of favorable migration pathways,such as the Donghe sandstone and unconformities,and some accumulated in the peripheral area of the depression without long migration because of late expulsion and lack of favorable migration pathways.

Key words: accumulation and diccipation of hydrocarbon, tectonization, platform-basin transitional area, Tarim basin

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