Oil & Gas Geology ›› 2014, Vol. 35 ›› Issue (2): 244-252.

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Controlling factors on physical property of tight volcanic rocks and reservoir quality prediction:a case study of the Tiaohu Formation in Marlang-Tiaohu Sag

Meng Yuanlin1, Hu Yue1, Li Xinning2, Hu Anwen1, Wu Chenliang3, Zhao Zitong1, Zhang Lei1, Xu Cheng1   

  1. 1. School of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
    2. Institute of Tuha Oilfield Company, Petrochina, Hami, Xinjiang 839009, China;
    3. C & C Reservoirs Inc., Houston, TX 77036, USA
  • Received:2013-12-20 Revised:2014-02-10 Online:2014-04-08 Published:2014-05-21

Abstract: Commercial oil flows were tested in the tight vitric and crystal sedimentary tuff reservoirs of the 2nd Member of Tiaohu Formation(P2t2)in Malang-Tiaohu Sag,Santanghu Basin.In order to reveal the distribution pattern of tight oil,we studied the influences of lithofacies and diagenesis on physical properties of volcanic reservoirs.And plane distribution of four types tight reservoir of P2t2 were predicted through numerical modeling of diagenesis and in combination with lithofacies map.The results show that the quality volcanic reservoir decreases with increasing levels of diagenesis;Pyroclastic rock and tuff are optimal reservoirs,followed by vitric and crystal sedimentary tuffs and pyroclastic rocks,and lavas show the worst reservoir property.The conventional reservoirs(porosity≥9%)distribute in the southern Malang-Tiaohu Sag,and slight tight reservoirs(7%≤porosity<9%)and strong tight reservoirs((4%≤porosity<7%)are located in the central-northern of Malang-Tiaohu Sag.Effective traps are the main exploration targets in area with conventional reservoirs,while the reservoirs and hydrocarbon source should be the focuses of study in area with tight reservoirs.

Key words: sedimentary tuff, tight oil, reservoir quality prediction, volcanic reservoir, Tiaohu Formation, Santanghu basin

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