石油学报 ›› 2015, Vol. 36 ›› Issue (2): 174-181.DOI: 10.7623/syxb201502005

• 地质勘探 • 上一篇    下一篇

塔里木盆地东河1油藏东河砂岩隔夹层形成的主控因素及流体来源

王洋1,2,3, 刘婧1,2,3, 汪建国4, 石开波1,2,3, 王超5, 牛玉杰5, 邵光强5, 刘波2   

  1. 1. 北京大学地球与空间科学学院 北京 100871;
    2. 北京大学石油与天然气研究中心 北京 100871;
    3. 中国石油勘探开发研究院 北京 100083;
    4. 中国石油学会 北京 100724;
    5. 中国石油塔里木油田公司勘探开发研究院 新疆库尔勒 841000
  • 收稿日期:2014-08-11 修回日期:2014-11-16 出版日期:2015-02-25 发布日期:2015-02-05
  • 通讯作者: 刘 波,男,1965年4月生,1986年获成都地质学院学士学位,1997年获北京大学地质系博士学位,现为北京大学石油与天然气研究中心副主任、研究员,主要从事盆地构造-沉积演化、储层沉积学、层序地层学、碳酸盐岩沉积-成岩作用研究。Email:bobliu@pku.edu.cn
  • 作者简介:王 洋,男,1991年9月生,2013年获中国地质大学(北京)资源勘查工程(能源)专业学士学位,现为北京大学与中国石油勘探开发研究院联合培养硕士研究生,主要从事碳酸盐成岩作用方面的研究工作。Email:jameswangpku@gmail.com
  • 基金资助:

    中国地质调查局项目"塔里木盆地碳酸盐岩油气地质调查及战略选区(带)评价"(1212011220760)资助。

Major controlling factors for the formation of inter-layer of Donghe sandstone of Donghe1 reservoir in Tarim Basin and its fluid source

Wang Yang1,2,3, Liu Jing1,2,3, Wang Jianguo4, Shi Kaibo1,2,3, Wang Chao5, Niu Yujie5, Shao Guangqiang5, Liu Bo2   

  1. 1. School of Earth and Space Sciences, Peking University, Beijing 100871, China;
    2. Oil and Gas Research Center, Peking University, Beijing 100871, China;
    3. Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    4. Chinese Petroleum Society, Beijing 100724, China;
    5. Exploration and Development Research Institute, PetroChina Tarim Oilfield Company, Xinjiang Korla 841000, China
  • Received:2014-08-11 Revised:2014-11-16 Online:2015-02-25 Published:2015-02-05

摘要:

通过大量的岩心、薄片观察,依据填隙物的种类和含量,将东河1油藏东河砂岩隔夹层分为钙质隔夹层、(含)泥钙质隔夹层和泥质隔夹层3类,以钙质隔夹层和(含)泥钙质隔夹层为主,泥质隔夹层相对不发育。隔夹层的形成主要受控于早成岩期的碳酸盐胶结作用。碳酸盐胶结物类型包括方解石、菱铁矿、铁方解石和铁白云石。根据岩相学和阴极发光特征的不同,识别出4期碳酸盐胶结物,各期碳酸盐胶结物成因和流体来源存在一定差异。第Ⅰ期胶结物为连晶或粗大片状的无铁无镁方解石,Fe、Mn元素含量很低,形成于未埋藏或浅埋藏与海水沟通的开放、氧化环境,钙质来源于海水;第Ⅱ、Ⅲ期胶结物沉淀于点-线接触的颗粒间,Mn元素含量显著上升,形成于半封闭—封闭的成岩环境,钙质流体来源于第Ⅰ期胶结物或同沉积期的碳酸盐颗粒的溶解;第Ⅳ期胶结物为铁方解石、铁白云石,具交代石英、长石矿物的特点,Fe元素含量远高于Mn元素含量,形成于相对深埋的还原环境,其形成与长石的溶解有关。

关键词: 东河砂岩, 隔夹层, 碳酸盐胶结物, 主控因素, 流体来源

Abstract:

Through massive cores and thin sections observation, and according to the types and content of interstitial materials, inter-layers of Donghe sandstone in Donghe1 reservoir were classified into three categories: calcareous inter-layer, mud-calcareous inter-layer and mud inter-layer. Calcareous inter-layer, mud-calcareous inter-layer are predominant while mud-calcareous inter-layers are less developed. The formation of inter-layers is primarily controlled by carbonate cementation in the early diagenetic stage. Carbonate cements include calcite, siderite, ferrocalcite and ferrodolomite. Four phases of carbonate cements with different causes and fluid sources were identified according to the different petrographical and cathode luminescence characteristics. The first-phase cements is inter-growth or coarse flaky, iron and magnesium free calcite with low content of Fe and Mn, formed under non buried or shallow buried open oxidizing environment which is connected with seawater. Calcium originates from seawater. The second- and third-phase cements are precipitated between point-line contacted particles. Mn content is increased significantly, formed under semi closed or closed diagenetic environment. Calcium fluid is sourced from the first-phase cements or syn-sedimentary dissolution of carbonate particles. The fourth phase cements were ferro-calcite and ferro-dolomite with replacing quartz and feldspar features. The content of Fe was much higher than that of Mn. It formed under relatively deep buried reducing environment, with relevance to the dissolution of feldspar.

Key words: Donghe sandstone, inter-layers, carbonate cement, controlling factors, fluid source

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