岩性油气藏 ›› 2017, Vol. 29 ›› Issue (1): 51–58.doi: 10.3969/j.issn.1673-8926.2017.01.007

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地周家湾地区长8致密砂岩储层特征及影响因素

王维斌1,2, 朱静1,2, 马文忠1,2, 冯顺彦1,2, 刘艳妮1,2, 赵静3   

  1. 1. 中国石油长庆油田分公司 勘探开发研究院, 西安 710018;
    2. 低渗透油气田勘探开发国家工程实验室, 西安 710018;
    3. 中国石油长庆油田分公司 西安长庆化工集团有限公司, 西安 710018
  • 收稿日期:2016-08-12 修回日期:2016-09-29 出版日期:2017-01-21 发布日期:2017-01-21
  • 第一作者:王维斌(1986-),男,硕士,工程师,主要从事油藏评价及油田开发方面的研究工作。地址:(710018)陕西省西安市未央区凤城四路中国石油长庆油田分公司勘探开发研究院。电话:(029)86594214。Email:wbwang_cq@petrochina.com.cn。
  • 基金资助:
    国家重大科技专项“鄂尔多斯盆地致密油资源潜力、甜点预测与关键技术应用”（编号:2016ZX05046-005）资助

Characteristics and influencing factors of Chang 8 tight sandstone reservoir of Triassic Yanchang Formation in Zhoujiawan area, Ordos Basin

WANG Weibin1,2, ZHU Jing1,2, MA Wenzhong1,2, FENG Shunyan1,2, LIU Yanni1,2, ZHAO Jing3   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi'an 710018, China;
    3. Xi'an Changqing Chemical Group Co., Ltd, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2016-08-12 Revised:2016-09-29 Online:2017-01-21 Published:2017-01-21

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摘要： 鄂尔多斯盆地周家湾地区三叠系延长组长8 致密砂岩储层特征和优质储层控制因素研究薄弱，制约了该区油气的勘探与开发进程。在岩心观察的基础上，结合大量铸体薄片、扫描电镜、压汞及常规物性等分析化验资料，对周家湾地区长8 致密砂岩储层的宏观和微观特征及其影响因素进行了研究。结果表明，长8 储层岩石类型以岩屑长石砂岩和长石岩屑砂岩为主，填隙物含量较高；长81 和长82小层的孔隙度分别为8.03% 和8.17%，渗透率分别为0.17 mD 和0.25 mD，均属致密砂岩储层，储层物性较差；储集空间以剩余原生粒间孔和次生长石溶孔为主，微细喉道，形成了长8 储层高排驱压力、高中值压力及低退汞效率的特征。受沉积和成岩作用的共同控制，研究区长8 油层组有利储层主要发育于分流河道和水下分流河道沉积微相中，压实作用、碳酸盐胶结作用和硅质胶结作用致使储层物性变差，溶蚀作用则有效改善了储层孔渗条件。

Abstract: The characteristics and controlling factors of Chang 8 tight sandstone reservoir of Triassic Yanchang Formation in Ordos Basin is unclear,which restricts the hydrocarbon exploration and development in this area. Based on core observation and data of cast thin sections,scanning electronic microscope,mercury intrusion and conventional physical properties,the characteristics and influencing factors of the Chang 8 tight sandstone reservoir were analyzed. The results show that the Chang 8 reservoir rocks are mainly composed of lithic arkose and feldspathic lithic sandstones,with high content of matrix. The porosity of Chang 81 and Chang 82 sublayers are 8.03% and 8.17%,respectively,and the permeability are 0.17 mD and 0.25 mD,respectively, showing the poor properties and tight sandstone reservoirs. The pores are dominated by the remaining primary intergranular pores and secondary feldspar dissolved pores,together with small throat,which characterizes the Chang 8 reservoir with high expulsion pressure,high median pressure and low ejection efficiency. Under the control of deposition and diagenesis,the favorable reservoirs are mainly developed in distributary channel and subaqueous distributary channel. Compaction,carbonate and siliceous cementation make the reservoir properties poor,and dissolution improve the reservoir porosity and permeability.

中图分类号: 

  • TE121.2
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