鄂尔多斯盆地神府地区太原组致密砂岩储层特征及成岩演化

doi:10.3969/j.issn.1673-8926.2017.06.007

岩性油气藏 ›› 2017, Vol. 29 ›› Issue (6): 51–59.doi: 10.3969/j.issn.1673-8926.2017.06.007

鄂尔多斯盆地神府地区太原组致密砂岩储层特征及成岩演化

刘再振, 刘玉明, 李洋冰, 柳雪青, 王月胜, 王海燕

中海油能源发展股份有限公司工程技术分公司, 天津 300452

收稿日期:2017-05-02 修回日期:2017-08-18 出版日期:2017-11-21 发布日期:2017-11-21
作者简介:刘再振(1989-),男,硕士,主要从事石油实验地质方面的研究工作。地址:(300452)天津市滨海新区闸北路3号中海油能源发展股份有限公司。Email:liuzzh6@cnooc.com.cn。
基金资助:
中海油能源发展股份有限公司重大专项"非常规油气评价实验配套核心技术研究"（编号：HFKJ-CJFZ-1302）资助

Tight sandstone reservoir characteristics and diagenesis evolution of Taiyuan Formation in Shenmu-Fugu area,Ordos Basin

LIU Zaizhen, LIU Yuming, LI Yangbing, LIU Xueqing, WANG Yuesheng, WANG Haiyan

Ener Tech-Drilling & Production Company, CNOOC, Tianjin 300452, China

Received:2017-05-02 Revised:2017-08-18 Online:2017-11-21 Published:2017-11-21

摘要/Abstract

摘要： 为阐明鄂尔多斯盆地神府地区太原组砂岩储层特征及其致密化成因，利用铸体薄片、扫描电镜、阴极发光及高压压汞等资料，分析胶结物及其与碎屑颗粒的胶结、交代作用，并研究了储层成岩序列、各类胶结物与孔隙的含量、孔隙度的演化过程等。结果表明：神府地区太原组储层以中-粗岩屑砂岩和长石岩屑砂岩为主，孔隙度为0.20%~12.00%，平均为6.95%，渗透率为0.10~5.00 mD，平均为0.91 mD，属于典型的低孔-特低孔、特低渗的致密砂岩储层；孔隙结构主要为小孔细喉和小孔微喉型；在孔隙演化中压实作用使孔隙度减少约15.5%，胶结作用减少孔隙约10.4%，溶蚀作用增加孔隙约4.41%，计算现今平均孔隙度为7.17%，与实测平均孔隙度6.95%相当。早期压实作用与晚期碳酸盐胶结作用是研究区储层致密的主要原因，而溶蚀作用有利于各类次生孔隙的发育，是改善储层孔渗性的关键因素。

关键词: CO₂驱油, 灰色关联分析, 采收率, 适宜性

Abstract: In order to elucidate sandstone reservoir characteristics of Taiyuan Formation and its genesis of the densification in Shenmu-Fugu area,Ordos Basin,based on the data of cast thin section,scanning electron microscope,cathodoluminescence and high-pressure mercury,cementation and metasomatism between the cement and its relation with clastic particles,the diagenetic sequence and porosity evolution process were analyzed. The results show that the reservoir is dominated by medium-coarse lithic sandstone and feldspathic lithic sandstone. The reservoir porosity is 0.20%-12.00%, with average of 6.95%, and the permeability is 0.10-5.00 mD, with average of 0.91 mD,which belongs to typical low-porosity and extra-low-permeability tight sandstone reservoir.The pore structure is mainly small pore with fine throat and small pore with micro throat. The porosity evolution shows that the porosity decreased 15.5% by compaction,reduced about 10.4% by cementation,and increased about 4.41% by dissolution. The calculated reservoir porosity of Taiyuan Formation is 7.17%,which is similar to the analyzed porosity of 6.95% in the laboratory. Early compaction and late carbonate cementation are the main causes for the reservoir densification,while dissolution is beneficial to develop secondary pores for improving reservoirs properties.

Key words: CO₂ flooding, grey correlation analysis, oil recovery, suitability

中图分类号:

TE122.2+3

刘再振, 刘玉明, 李洋冰, 柳雪青, 王月胜, 王海燕. 鄂尔多斯盆地神府地区太原组致密砂岩储层特征及成岩演化[J]. 岩性油气藏, 2017, 29(6): 51–59.

LIU Zaizhen, LIU Yuming, LI Yangbing, LIU Xueqing, WANG Yuesheng, WANG Haiyan. Tight sandstone reservoir characteristics and diagenesis evolution of Taiyuan Formation in Shenmu-Fugu area,Ordos Basin[J]. Lithologic Reservoirs, 2017, 29(6): 51–59.

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鄂尔多斯盆地神府地区太原组致密砂岩储层特征及成岩演化

Tight sandstone reservoir characteristics and diagenesis evolution of Taiyuan Formation in Shenmu-Fugu area,Ordos Basin

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