尹浪,赵峰,唐洪明,舒润,彭东宇.雷家地区沙四段致密油储层特征研究[J].地质找矿论丛,2020,35(2):178-186
雷家地区沙四段致密油储层特征研究
Research on the characteristics of the dense oil reservoir in the Sha4 member of the Shahejie Formation in Leijia aera
投稿时间:2019-09-23  
DOI:10.6053/j.issn.1001-1412.2020.02.007
中文关键词:  致密油  沙四段  储层特征  孔隙结构  储集空间  辽河盆地
英文关键词:tight oil  fourth member of Shahejie Formation  reservoir characteristics  pore structure  reservoir space  Liaohe Basin
基金项目:国家自然科学基金面上项目"页岩纳米尺度非均质性研究"(编号:51674211)、国家自然科学基金重点项目"致密气藏储层干化、提高气体渗流能力的基础研究"(编号:51534006)联合资助。
作者单位
尹浪 西南石油大学地球科学与技术学院, 成都 610500
西南石油大学油气藏地质用开发工程国家重点实验室, 成都 610500 
赵峰 西南石油大学地球科学与技术学院, 成都 610500
西南石油大学油气藏地质用开发工程国家重点实验室, 成都 610500 
唐洪明 西南石油大学地球科学与技术学院, 成都 610500
西南石油大学油气藏地质用开发工程国家重点实验室, 成都 610500 
舒润 西南石油大学地球科学与技术学院, 成都 610500
西南石油大学油气藏地质用开发工程国家重点实验室, 成都 610500 
彭东宇 西南石油大学地球科学与技术学院, 成都 610500
西南石油大学油气藏地质用开发工程国家重点实验室, 成都 610500 
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中文摘要:
      雷家地区沙四段致密油的开采和研究刚刚起步,在地质认识方面尚不够深刻。本文通过对雷家地区沙四段岩芯观察、XRD衍射、铸体薄片、场发射扫描电镜、氩离子抛光扫描电镜、CT扫描及氮气吸附等方法对沙四段储层地质特征展开系统分析,结果发现:该区主要发育白云岩,根据组成矿物含量的不同可分为白云岩类、方沸石岩类和泥岩类3大类15种岩;孔隙度分布范围1.68%~11.65%,渗透率介于0.01~6.35 mD,属于特低孔特低渗型储层;储集空间类型多样,主要发育溶蚀孔、晶间孔、有机质孔裂缝,该区孔隙结构较复杂,存在少量大孔,但主要由纳米孔组成,孔隙分布较为分散,喉道数量少,连通性差;根据该段储层孔隙结构及储集空间分布特征,将该段储层分为孔隙型、裂缝型和裂缝-孔隙型3类,其中孔隙型储层孔隙分布较为分散、连通性较差,裂缝型储层岩性主要为泥岩类,裂缝-孔隙型储层物性相对较好且主要发育在杜家台段。
英文摘要:
      The exploitation and research of dense oil in Sha4 member of Leijia area has just started and geological understanding of the reservoir is not deep enough. In this paper, the geological characteristics of Sha4 member reservoir are systematically analyzed by means of core observation, XRD diffraction, casting thin section, field emission scanning electron microscope, argon ion polishing scanning electron microscope, CT scanning and nitrogen adsorption. Dolomite is the main rock here. According to mineral content three types of rock, dolomitoid, zeolitoid and mudstonoid and 15 sub-types are identified in the reservoir. The porosity is in range 1.68% ~11.65%, and the permeability 0.01~6.35 mD. It belongs to ultra-low porosity and ultra-low permeability reservoir. There are many types of reservoir space, such as dissolution pore, intercrystal pore and organic matter pore fracture. The pore structure is complex. Although a small number of macropores occur nano-pores is dominant. The pores are scattered and the number of throat is small thus the connectivity poor. According to the pore structure and the space distribution characteristics of the reservoir, the reservoir can be divided into three types: pore type, fracture type and fracture-pore type. Among them, the pore distribution of pore type reservoir is scattered and the connectivity is poor. The lithology of fracture reservoir is mainly mudstone, and the physical properties of fracture-pore reservoir are relatively good, which are mainly developed in Dujiatai section.
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