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，与孔一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，沿北东向控盆（陷）断裂条带状展布的砂岩储层物性较好。
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.
出处
《地球科学期刊（中英文版）》
2014年第3期156-164,共9页
Scientific Journal of Earth Science
关键词
铜钵庙组储层
岩石学
物性特征
影响因素
微观结构
塔南凹陷
塔木察格盆地
Reservoir of Tongbomiao Formation
Petrology
Physical Property
Influential Factors
Micro-texture
Tanan Sag
Tamtsag Basin
