Scientific Journal of Earth Science September 2014, Volume 4, Issue 3, PP.156-164
Main Characters of Reservoir of Tongbomiao Formation in Tanan Sag, Tamtsag Basin, Mongolia He Liu1, Chunbai Li1, Qiang Li1, Genyao Wu2#, Ge Zhang1, Xiaodong Sun1 1. Exploration and Development Research Institute of Daqing Oilfield Ltd., Daqing, Heilongjiang 163712, China 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China #
Email: wugenyao@mail.iggcas.ac.cn
Abstract The Tongbomiao Formation is the first group of reservoirs in the Lower Cretaceous of the Tanan Sag, whose majority is, lithologically, sandy conglomerate, tuff and sandstone. This paper introduces the petrology, fragmental components and interstitial materials of the No.1 and No.2 Oil Layers (sandstones), and points out the pore types being mainly intergranular pore and inner-granular solution opening. The physical property of the reservoir is, principally, extra-lower porosity and super-lower permeability. The reservoir’s physical property is mainly influenced by the sedimentary facies, the sandstone of deltaic inner front having the best property. Secondly, it is affected by the buried depth, the property being worse with the depth becoming larger. Thirdly, the physical property is inversely proportional to the contents of clay minerals. In addition, the porosity- and permeability-related cements are formed in post-diagenetic period. The reservoir’s throat is, commonly, finer one, and subordinately, fine and micro-fine throats. The reservoir’s void is, commonly, extra-small one, and subordinately, small and middle voids. Based on what mentioned above, the reservoir’s micro-texture can be divided into five types. The reservoir’s thickness of the Tongbomiao Formation is larger near the source regions. Correspondingly, the physical property is relatively better for the sandstones which are distributed along the NE-orientated basin-(depression-) controlling faults linearly. Towards the sag’s center, the property becomes worse with the buried depth being larger. Keywords: Reservoir of Tongbomiao Formation; Petrology; Physical Property; Influential Factors; Micro-texture; Tanan Sag; Tamtsag Basin
蒙古国塔木察格盆地塔南凹陷铜钵庙组储层的主 要特征 刘赫 1,李春柏 1,李强 1,吴根耀 2,张革 1,孙效东 1 1.大庆油田有限责任公司勘探开发研究院,黑龙江 大庆 163712 2.中国科学院 地质与地球物理研究所,北京 100029 摘
要:铜钵庙组是塔南凹陷下白垩统的第一套储层,岩性主要为砂质砾岩、凝灰岩和砂岩。本文介绍了铜钵庙组 I 油组
(砂层)和 II 油组(砂层)的储层岩性、碎屑组份和填隙物,指出孔隙类型为粒间孔和粒内溶孔。储层物性以特低孔隙、 超低渗为主,低孔、特低渗次之。研究表明,影响储层物性的主要因素是岩相(扇三角洲内前缘亚相的砂岩储层物性最 好) 、埋深及粘土矿物含量。此外,与孔-渗有关的胶结物主要形成于成岩作用的后生期。储层喉道以较细喉为多见,次为 细喉和微细喉,孔隙则以特小孔道为多见,也见小孔道和中孔道。综合分析表明,铜钵庙组储层在近物源处厚度较大,
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