Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 639-650.doi: 10.13278/j.cnki.jjuese.201603102

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Geological Characteristics and Hydrocarbon Accumulation of Ucayali Basin, Peru

Wang Jianjun1, Li Haowu1, Hu Xiangyu1, Wang Qing1, Wang Bin2, Yang Cang3   

  1. 1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;
    2. Research Institute of Petroleum Exploration & Development, Tarim Oil Field Branch Company, PetroChina, Korla 841000, Xinjiang, China;
    3. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China
  • Received:2016-01-10 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by the National Science and Technology Major Project (2016ZX05029)

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Abstract:

Based on the geological and hydrocarbon accumulation characteristics, there will be other types of hydrocarbon traps in Ucayali basin, such as extensional fault block, buried hill, reef, stratigraphic pinchout, channel sand and the footwall of thrust fault, besides the discovered thrust anticline/faulted anticline oil & gas fields. The in-sequence thrust anticline/faulted anticline will be the main traps. The traps were not well developed before the foreland orogeny, and the current hydrocarbon accumulations were mostly the product of secondary migration. The intrusion of freshwater mildly degraded most of oil in shallow reservoirs. Due to the separation of the Shira uplift, it was difficult for the hydrocarbon generating in the Western Sub basin to migrate into the Eastern Sub basin. The source rocks in the Eastern Sub basin was not buried deeply enough, the Ene Formation had limited distribution, the Ambo Group was gas prone, only limited liquid were generated in oil window, and the traps were growing, so the filling of traps were generally low. The active faults also are barriers for hydrocarbon parallel migration, the traps in the eastern side often have charge risk, and have little chance to form large oil accumulation. The Southern and Western Sub basins had good conditions for hydrocarbon accumulation, the thrust folds were well developed, the traps were continuously charging, and most likely to form gas fields. The foot wall anticlines of thrust faults will be the potential targets in Southern Sub basin. The Ene Sub basin is in low degree of exploration, and with perfect source rocks, so it has the potential to find large structural traps.

Key words: Ucayali basin, petroleum conditions, Shira uplift, migration barrier, hydrocarbon accumulation, exploration potential

CLC Number: 

  • P618.13

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