地学前缘 ›› 2018, Vol. 25 ›› Issue (2): 147-158.DOI: 10.13745/j.esf.yx.2017-6-5

• 致密储层形成机理与孔隙演化 • 上一篇    下一篇

湖相富火山物质复杂储层的岩石学特征及成岩作用:以二连盆地阿南凹陷下白垩统腾一段为例

魏巍,朱筱敏,朱世发,孙书洋,吴健平,王名巍,吕思翰   

  1. 1. 中国石油大学(北京) 地球科学学院, 北京 102249
    2. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249
    3. 中国石油华北油田分公司 勘探开发研究院, 河北 任丘 062550
    4. 中国石油大庆油田第三采油厂电力大队, 黑龙江 大庆 163000
  • 收稿日期:2017-03-20 修回日期:2017-04-20 出版日期:2018-03-15 发布日期:2018-03-15
  • 作者简介:魏巍(1988—),女,博士研究生,地质学专业,主要从事储层沉积和成岩研究。E-mail:hunqiu8854@gmail.com
  • 基金资助:
    国家自然科学基金项目(41272133)

Petrologic and diagenetic characteristics of the lacustrine volcanicsiliciclastic tight reservoir: an example from the first member of the Tenggeer Formation in the Lower Cretaceous, Anan Sag,

WEI Wei,ZHU Xiaomin,ZHU Shifa,SUN Shuyang,WU Jianping,WANG Mingwei,L  Sihan   

  1. 1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
    3. Research Institute of Petroleum Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062550, China
    4. Power Group, No.3 Oil Production Plant, PetroChina Daqing Oilfield Company, Daqing 163000, China
  • Received:2017-03-20 Revised:2017-04-20 Online:2018-03-15 Published:2018-03-15

摘要: 二连盆地下白垩统烃源岩中普遍发育一套粒度偏细的富凝灰质的复杂岩性段,包括(沉)凝灰岩、凝灰质泥岩及凝灰质砂岩。以阿南凹陷腾格尔组一段为研究对象,通过岩心、薄片、扫描电镜、阴极发光及X衍射矿物分析等手段,讨论凝灰岩及凝灰质岩储层的岩石学特征及成岩作用。研究区凝灰岩主要呈薄层状夹于厚层泥岩中,分布在深湖半深湖亚相,储层物性较好,以脱玻化孔为主,局部见隐晶、微晶的长英质或白云石充填脱玻孔或粒间孔。沉凝灰岩和凝灰质泥岩主要分布于扇三角洲前缘席状砂远端和滨浅湖亚相,处于中成岩阶段A2亚期,以凝灰质蚀变作用为主,生成的黏土矿物易充填孔隙,导致储层物性较差,以微孔和构造微裂隙为主。凝灰质砂岩主要分布于扇三角洲前缘,处于中成岩阶段A1亚期,溶蚀作用强烈,导致储层物性较好,以长石和方解石胶结物溶孔为主。研究表明,阿南凹陷腾一段的有利储层主要为分布在半深湖深湖亚相的凝灰岩及扇三角洲前缘的凝灰质砂岩。

 

关键词: 凝灰岩, 凝灰质岩, 成岩作用, 腾一段, 阿南凹陷, 二连盆地

Abstract: The Lower Cretaceous source rocks in most Erlian Basin sags developed a set of tight rocks including tuff, tuffite, tuffaceous mud and sandstones. Here, in the first member of the Tenggeer Formation in the Lower Cretaceous of the Anan Sag, and taking tuffaceous rocks as research objects, the petrologic and diagenetic characteristics of mixed rocks were studied using core observation, microscopy, scanning electron microscopy (SEM), cathode luminescence (CL) and Xray diffraction techniques. The results show that the thin lithic tuff, developed in the semideep to deep lakes, exhibits strong devitrification with localized occurrences of microcrystalline feldspar, quartz and dolomite. In comparison, the tuffite and tuffaceous mudstone, developed in the sand sheet of fandelta front and semideep to deep lakes, are mainly in the A2 mesogenetic stage, characterized by dolomite cementation with strong devitrification in authigenic clay minerals. Its reservoir space is relatively small and composed primarily of developing micropores and structural microcracks. Lastly, the tuffaceous sandstone, developed in the sand sheet of fandelta front, is mainly in the A1 mesogenetic stage and characterized by strong compaction and calcite cementation, followed by dolomite and siliceous cementation. Its reservoir space, containing less primary developing pores, is mainly made of dissolution pores formed by dissolved feldspar fragments and carbonate cements. The semideep to deep lacustrine tuff and fandelta front tuffaceous sandstone, therefore, are the favorable reservoir zones in the Anan Sag.

Key words:  tuff, tuffaceous rock, diagenesis, first member of Tenggeer Formation, Anan Sag, Erlian Basin

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