Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (3): 407-416,423.doi: 10.11743/ogg20120310

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Migration system types and their control on hydrocarbon accumulation in central fault depressions of Hailar-Tamtsag Basin

Li Mingyi1, Yue Xiang’an1, Jiang Qingchun2, Wang Hongwei3, Wu Yulin4   

  1. 1. Petroleum and Natural Gas Engineering College, China University of Petroleum, Beijing 102249, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    3. Exploration and Development Research Institute, PetroChina Daqing Oilfield Company, Daqing, Heilongjiang 163712, China;
    4. Sichuan Geophysical Company, CNPC Chuangqing Drilling Engineering Company Limited, Chengdu, Sichuan 610213, China
  • Received:2012-01-05 Revised:2012-04-15 Online:2012-06-28 Published:2012-07-10

Abstract:

The types of source-reservoir-cap rock assemblages,migration systems and their control on hydrocarbon accumulation in the main central fault depressions in Hailar-Tamtsag Basin(Haita Basin)were investigated by analyzing spatial combinations of hydrocarbon accumulation elements and processes.Three types of source-reservoir-cap rock assemblages were recognized,including self-source and self-reservoir,up-source and down-reservoir,and down-source and up-reservoir.Different source-reservoir-cap assemblages have different hydrocarbon migration and accomulation systems.For the self-source and self-reservoir type,hydrocarbon migration pathways are pore-fracture and comb-like systems.Subsags connected by the pore-fracture system and tilting uplifts and uplifts within sag connected by the comb-like system are favorable for development of lithologic reservoirs.For the up-source and down-reservoirs type,the migration system is flower-like.The reverse structures connected by the flower-like system are favorable for hydrocarbon accumulation.For the down-source and up-reservoir type,the migration systems are step-like or inverted U-shaped.The palaeouplifts connected by unconformities are favorable for hydrocarbon accumulation.

Key words: source-reservoir-cap assemblage, migration system, hydrocarbon accumulation, fault depression, Hailar-Tamtsag Basin

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