天然气地球科学

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鄂尔多斯盆地天环地区盒8段致密砂岩岩石矿物特征及其对储层质量的影响

高阳1,2,3,王志章1,易士威2,3,佘源琦2,3,林世国2,3,李明鹏2,3,张春林2,3   

  1. 1.中国石油大学,北京 102200;2.中国石油勘探开发研究院,河北 廊坊 065007;
    3.中国石油天然气集团公司天然气成藏与开发重点实验室,河北 廊坊 065007
  • 收稿日期:2018-10-26 修回日期:2018-12-13 出版日期:2019-03-10
  • 通讯作者: 王志章(1962-),男,山东寿光人,教授,博士生导师,主要从事油气藏描述和表征研究. E-mail:whx3998@vip.sina.com.
  • 作者简介:高阳(1983-),男,辽宁鞍山人,工程师,博士研究生,主要从事油气综合地质研究.E-mail:gaoyang69@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项“大型气田成藏机制、富集规律与勘探新领域”(编号:2016ZX05007-003)资助.

Mineral characteristic of rocks and its impact on the reservoir quality of He 8 tight sandstone of Tianhuan area,Ordos Basin

Gao Yang1,2,3,Wang Zhi-zhang1,Yi Shi-wei2,3,She Yuan-qi2,3,Lin Shi-guo2,3,Li Ming-peng2,3,Zhang Chun-lin2,3   

  1. 1.China University of Petroleum,Beijing  102249;2.PetroChina Research Institute of Petroleum Exploration & Development,Langfang 065007;
    3.Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang 065007
  • Received:2018-10-26 Revised:2018-12-13 Online:2019-03-10

摘要: 致密砂岩储层低孔、低渗且非均质性强,储层质量是勘探中的主要风险。通过普通铸体薄片、场发射扫描电镜、包裹体温度分析等实验手段,研究鄂尔多斯盆地天环地区盒8段砂岩岩石学组分及胶结物对不同类型致密砂岩储层质量的影响,对预测致密砂岩气藏潜在有利区具有重要意义。结果表明,石英次生加大、高岭石、伊利石是控制盒8段砂岩质量的主要胶结物,塑性岩屑含量对储层质量也有明显控制作用。石英砂岩以次生溶蚀孔隙为主要的孔隙类型,储层质量主要受石英次生加大和高岭石发育情况控制,孔隙度平均为7.6%,渗透率平均为0.78×10-3μm2;岩屑砂岩以晶间孔为主要孔隙类型,高含量塑性岩屑和伊利石胶结物控制储层早期致密化,孔隙度平均为4.31%,渗透率平均为0.07×10-3μm2;岩屑石英砂岩岩石矿物组分含量介于石英砂岩和岩屑砂岩之间,早期压实作用和次生孔隙发育共同控制其储层质量,孔隙度平均为6.64%,渗透率平均为0.34×10-3μm2

关键词: 鄂尔多斯盆地, 致密砂岩气藏, 石盒子组, 岩石学组分, 胶结物

Abstract: Tight sandstone reservoir has low porosity,low permeability and strong heterogeneity,therefore reservoir quality is the main risk in exploration.In this paper,research on effects of petrology and cementation on the quality of different types of tight sandstone reservoirs in the He 8 member of Tianhuan area,Ordos Basin,is carried out by means of common casting thin sections,field-emission scanning electron microscope,and inclusion temperature analysis.So,this study is of great importance on potential gas reservoir explorations.The results show that quartz overgrowth,kaolinite and illite are the main cementation to control the quality of sandstone in the He 8 member,while ductile rock fragment is another key factor to influence the quality.The main pore types of quartz sandstone are secondary pores,and the reservoir quality is mainly controlled by quartz overgrowth,as well as development of kaolinite.The average permeability is 0.78×10-3μm2,while the porosity is 7.6%.The main pore type of lithic sandstone is intercrystal pore,and the reservoir turns into tight sandstone very early due to illite cementation and the high content of ductile rock fragment.The average porosity is 4.31%,while the permeability is 0.07×10-3μm2.The mineral component content of lithic quartz sandstones is between that of quartz sandstones and lithic sandstones.Early compaction and secondary pore development are the two main factors that controls the reservoir quality.The average porosity is 6.64% and the average permeability is 0.34×10-3μm2.

Key words: Ordos Basin, Tight sandstone gas reservoir, Shihezi Formation, Petrological component, Cementation

中图分类号: 

  • TE122.2
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