Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 68-76.doi: 10.3969/j.issn.1673-8926.2017.02.009

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Lithofacies and reservoir space characteristics of the tuffaceoussiliciclastic mixed rocks of the Lower Cretaceous Tenggeer Formation in Anan Sag, Erlian Basin

WEIWei1,2, ZHU Xiaomin1,2, ZHU Shifa1,2, HE Mingwei1,2, WU Jianping3, WANG Mingwei3   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China
  • Received:2016-11-18 Revised:2016-12-18 Online:2017-03-21 Published:2017-03-21

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Abstract: The Lower Cretaceous Tenggeer Formation developed a set of lacustrine tight oil tuffaceous-siliciclastic mixed rocks in Anan Sag of Erlian Basin, which has become an important exploration target. Based on the data of core observation, thin section, scanning electron microscope, and X-ray diffraction, the lithologies, lithofacies and reservoir spaces of the mixed rocks were studied. This set of mixed rocks are mainly grey-green to grey tuffaceous rocks, including tuff, tuffite, tuffaceous sandstone and tuffaceous mudstone. The tuffite and tuffaceous mudstone are widely developed. There are six types of lithofacies:massive tuff, massive tuffite, deformed tuffite, massive tuffaceous sandstone, wavy-bedding tuffaceous sandstone, massive tuffaceous mudstone and horizonalbedding tuffaceous mudstone. The massive tuff lithofacies is characterized by middle to low porosity and ultralow permeability reservoir. It is the best reservoir in the mixed rocks,and its main reservoir space is devitrified pores. The deformed tuffite lithofacies is chaterized by extremely low porosity and low to ultra-low permeability reservoir, with good reservoir properties and the main reservoir space of dissolved pores and marix pores. The massive tuffite lithofacies, massive tuffaceous sandstone lithofacies and wavy-bedding tuffaceous sandstone lithofacies are characterized by extremely low porosity and ultra-low permeability reservoir. It is poor reservoir, and its main reservoir spaces are crystal fragments dissolved pores and crystal intergranular pores.

CLC Number: 

  • TE122.2
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