Acta Petrolei Sinica ›› 2019, Vol. 40 ›› Issue (11): 1331-1345,1367.DOI: 10.7623/syxb201911004

• Petroleum Exploration • Previous Articles     Next Articles

Low-permeability reservoir types classification and reservoir sensitivity controlling factors: a case study of Paleogene in Bohai Sea

Lu Huan1, Wang Qingbin1, Du Xiaofeng1, Guo Longlong1, Yan Ge1, Wang Xiabin2, Liu Junzhao1   

  1. 1. Tianjin Branch, CNOOC China Limited, Tianjin 300459, China;
    2. CNOOC Research Institute Co., Ltd., Beijing 100028, China
  • Received:2019-02-08 Revised:2019-08-06 Online:2019-11-25 Published:2019-12-07

低渗透储层类型划分及储层敏感性主控因素——以渤海海域古近系为例

卢欢1, 王清斌1, 杜晓峰1, 郭龙龙1, 燕歌1, 王夏斌2, 刘军钊1   

  1. 1. 中海石油(中国)有限公司天津分公司 天津 300459;
    2. 中海油研究总院有限责任公司 北京 100028
  • 通讯作者: 卢欢,女,1988年2月生,2010年获长江大学学士学位,2013年获中国石油大学(北京)硕士学位,现为中海石油(中国)有限公司天津分公司渤海石油研究院工程师,主要从事储层地质研究工作。Email:luhuan@cnooc.com.cn
  • 作者简介:卢欢,女,1988年2月生,2010年获长江大学学士学位,2013年获中国石油大学(北京)硕士学位,现为中海石油(中国)有限公司天津分公司渤海石油研究院工程师,主要从事储层地质研究工作。Email:luhuan@cnooc.com.cn
  • 基金资助:

    国家科技重大专项(2016ZX05024-003)和中海石油(中国)有限公司科技项目"中海油‘十三五’油气资源评价"(YXKY-2018-KT-01)资助。

Abstract:

Through the identification of thin sections, SEM analysis, sensitivity experiment of reservoirs and other analytical methods, this paper subdivides the types of low-porosity and low-permeability reservoirs in Bohai Sea, conducts a detailed study on the reservoir sensitivity of various reservoir-developed intervals and the characteristics, content and distribution of the corresponding clay minerals, and analyzes the effects of different sedimentary conditions on reservoir sensitivity. The results show that the low-permeability reservoirs in Bohai Sea are classified into kaolinite-rich type, illite-rich type, chlorite-rich type and carbonate dense cementation type. By establishing the relation between the genesis of low-permeability reservoirs with reservoir sensitivity, it is proposed that reservoir sensitivity is mainly controlled by three factors:parent rock type, paleoclimate conditions and sedimentary microfacies. First, parent rock type has a decisive influence on the evolution of the Paleogene clastic reservoirs in the study area. There are three main types of parent rocks, i.e., clastic reservoirs with intermediate-basic volcanic rocks as parent rocks, pyroclastic-kaolinite type of clastic reservoirs with intermediate-acidic volcanic rocks as parent rocks, and illite type of clastic reservoirs with metamorphic rocks as parent rocks. Paleoclimatic conditions have a vital impact on reservoir sensitivity. Sedimentary microfacies have a direct influence on the differentiation of clay minerals is directly affected and an indirect influence on the late diagenesis.

Key words: Bohai Sea area, Paleogene, low-permeability reservoir, sensitivity, sedimentary condition

摘要:

利用岩石薄片鉴定、扫描电镜分析、储层敏感性实验等多种分析手段,对渤海海域低孔低渗储层的类型进行了详细划分,并对各类储层发育段的储层敏感性特征及其对应的黏土矿物特征、含量和分布规律进行了详细研究,分析了不同沉积条件对储层敏感性的影响。研究结果表明,渤海海域低渗透储层可划分为富高岭石型、富伊利石型、富绿泥石型、碳酸盐致密胶结型。通过将低渗透储层成因与储层敏感性建立关联,提出了储层敏感性主要受控于母岩类型、古气候条件、沉积微相3个因素:①母岩类型对研究区古近系碎屑岩储层演化起决定性影响。研究区主要具有3种类型的母岩:以中基性火山岩为母岩的碎屑岩储层、以中酸性火山岩为母岩的碎屑岩储层为火山碎屑—高岭石型、以变质岩为母岩的碎屑岩储层为伊利石型。②古气候条件对储层敏感性起到了重要影响。③沉积微相直接影响黏土矿物分异,沉积微相还间接影响后期成岩作用。

关键词: 渤海海域, 古近系, 低渗透储层, 敏感性, 沉积条件

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