Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 495-506.doi: 10.13278/j.cnki.jjuese.201502113

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Relationship Between Lithofacies and Physical Properties of Sandy Conglomerate Reservoirs of Es4s in Yanjia Area,Dongying Depression

Ma Benben1, Cao Yingchang1, Wang Yanzhong1, Liu Huimin2, Gao Yongjin2   

  1. 1. School of Geosciences, China University of Petroleum, Qingdao 266555, Shandong, China;
    2. Geological Scientfic Research Institute of Shengli Oil Field Company, SINOPEC, Dongying 257015, Shandong, China
  • Received:2014-05-06 Published:2015-03-26

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Abstract:

According to the characteristics of lithology, particle size as well as sedimentary structure, the sandy conglomerate bodies are divided into 10 types of lithofacies as well as 13 types of lithofacies assemblages; each of which is of the same event deposits of Es4s in Yanjia Dongying depression. The types of lithofacies assemblages are further divided into three categories and six subcategories. The scientific issue is that the range of the physical parameters of the sandy conglomerate reservoirs are relatively large at an arbitrary depth. Following the thought of "types of lithofacies assemblages-types of lithofacies-distance from sand-mud boundary", and decomposing the lithofacies step by step, we achieved the charts of longitudinal physical property evolution which are restrained within each group of the lithoface division. Within each group of the lithofacies, the range of physical parameters of the lithoface is relatively small at an arbitrary depth: the range of porosity is ±2%; while the range of permeability is in one order of magnitude. When the lithofacies are far away from the mudstone, their physical property becomes weak with the increase of the burial depth. The physical property of type Ⅱ lithofacies is better than those of type Ⅰ lithofacies at the same depth. Compared to the lithoface types, which are at the bottom of lithoface assemblages far away from mud, the corresponding depth-upper-limit of different grades of porosity and permeability of the lithofacies types of the middle fan is 800-1 200 m deeper than that of the inner fan. Compared to lithofacies types which are at the middle-upper part of lithofacies assemblages far away from mud, the corresponding depth-upper-limit of different grades of porosity and permeability of the lithofacies types of the middle fan is 1 100-1 650 m deeper than that of the inner fan. The sandstones near mudstones in middle fan and thin sandstones in outer fan both have weak physical properties because of their intensive cementation. They are ultra-low porosity and ultra-low permeability reservoirs under the depth of 3 400 m.

Key words: nearshore subaqueous fan, sandy conglomerate, lithofacies, physical properties, reservoirs Es4s, Dongying depression

CLC Number: 

  • P618.13

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