石油与天然气地质 ›› 2007, Vol. 28 ›› Issue (4): 504-510.doi: 10.11743/ogg20070410

• 储层沉积、构造及储层预测 • 上一篇    下一篇

沾化凹陷五号桩地区沙河街组三段浊流沉积特征及储集性能

孟万斌1, 张善文2, 田波2, 冯斌2   

  1. 1. 成都理工大学, "油气藏地质及开发工程"国家重点实验室, 四川, 成都, 610059;
    2. 中国石化, 胜利油田有限公司, 山东, 东营, 257001
  • 收稿日期:2007-05-23 出版日期:2007-08-25 发布日期:2012-01-16

Depositional characteristics and reservoir properties of turbidites in the 3rd member of Shahejie Formation in Wuhaozhuang area,eastern Zhanhua depression

Meng Wanbin1, Zhang Shanwen2, Tian Bo2, Feng Bin2   

  1. 1. State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059;
    2. SINOPEC Shengli Oilfield Company Ltd., Dongying, Shandong 257062
  • Received:2007-05-23 Online:2007-08-25 Published:2012-01-16

PDF (PC)

477

被引次数

38

摘要：

沾化凹陷五号桩地区古近系沙河街组三段发育两期近岸浊积扇,是该区沙河街组三段下亚段的主力产层。扇体主要由砾岩、砂砾岩、砂岩及暗色泥、页岩组成,砂岩成分成熟度和结构成熟度均较低。砂体主要成因类型为富砾的主沟道砂体、富砂的中扇辫状水道充填砂体和砂、泥混合的中扇前缘砂体。不同成因砂体具有不同的沉积特征、结构特征和储集性能。富砂的辫状水道砂体平均孔隙度为13.1%～13.5%,平均渗透率为0.87×10-3～5.95×10-3μm2,其物性好于富砾的主沟道砂体和中扇前缘砂体,是主要的储集层。上、下两套扇体的储集性能也存在较大差异。上部扇体储层物性较好但油层厚度小,含油面积小;下部扇体储层物性较差但油层厚度大,含油面积大。砂体的沉积特征、结构特征以及成岩作用是影响储层物性的主要因素。砂体分选好,则物性好;砂体结构对储集性能的控制主要表现在对储集体侧向连续性和垂向连通性的影响方面;成岩作用则影响了储层孔隙的发育。

关键词: 储层物性, 沉积特征, 浊积扇, 沙河街组三段, 沾化凹陷

Abstract:

Two-phase proximal turbidite fans are developed in the 3rd member of Shahejie Formation in Wuhaozhuang area,eastern Zhanhua depression,and they form the major pay zones in the lower sub-member of the 3rd member.The fan is mainly composed of conglomerate,glutenite and dark mudstone and shale,in which the sandsone is low in both compositional maturity and textural maturity.The major genetic types of sandbodies are gravel-rich main channel sandstone,sand-rich midfan braided channel fill,and midfan front lakes with mixed sand/mud.Sandbodies of different types are different depositional and textural characteristics and reservoir properties.The braided channel sandbodies have a better poroperm characteristics than that of the gravel-rich main channel sandstone and midfan front lobes,and serve as the main reservoirs with its mean porosity of 13.1%～13.5% and mean permeability of 0.87×10-3～5.95×10-3μm2.The reservoir properties also vary tremendously between the upper and lower fans with the former having better poroperm characteristics but thinner net sands and smaller oil-bearing area while the latter having average physical properties but thicker net sands and bigger oil-bearing area.It is suggested that better gradation of sandbodies means better poroperm characteristics,sandbody architectures control the reservoir properties through exerting influences upon the lateral continuity and vertical connectivity of the reservoirs,and diagenesis influences the growth of reservoir pores.

Key words: reservoir property, sedimentary characteristics, turbidite fan, the 3rd member of Shahejie Formation, Zhanhua depression

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