鄂尔多斯盆地陕北地区延长组致密砂岩储层敏感性评价

doi:10.13278/j.cnki.jjuese.20170126

吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (4): 981-990.doi: 10.13278/j.cnki.jjuese.20170126

鄂尔多斯盆地陕北地区延长组致密砂岩储层敏感性评价

王玉霞^1,2, 周立发^1,2, 焦尊生^2,3, 尚庆华⁴, 黄生旺¹

1. 大陆动力学国家重点实验室/西北大学地质学系, 西安 710069;
2. 陕西省能源化工研究院, 西安 710069;
3. 怀俄明大学能源学院, 美国怀俄明州拉勒米 82071;
4. 陕西延长石油(集团)有限责任公司研究院, 西安 710075

收稿日期:2017-09-24 出版日期:2018-07-26 发布日期:2018-07-26
作者简介:王玉霞(1985-),女,博士研究生,主要从事油气地质与开发方面的研究,E-mail:wang0xia1@126.com
基金资助:
陕西省科技统筹创新工程计划项目（2014KTZB03-02-02）

Sensitivity Evaluation of Tight Sandstone Reservoir in Yanchang Formation in Shanbei Area, Ordos Basin

Wang Yuxia^1,2, Zhou Lifa^1,2, Jiao Zunsheng^2,3, Shang Qinghua⁴, Huang Shengwang¹

1. State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, China;
2. Shaanxi Provincial Institute of Energy Resources & Chemical Engineering, Xi'an 710069, China;
3. School of Energy Resources, University of Wyoming, Laramie 82071, Wyoming, USA;
4. Research Institute of Shaanxi Yanchang Petroleum(Group) Co. Ltd., Xi'an 710075, China

Received:2017-09-24 Online:2018-07-26 Published:2018-07-26
Supported by:
Supported by Shaanxi Provincial Science and Technology Overall Innovation Project (2014KTZB03-02-02)

摘要/Abstract

摘要： 以鄂尔多斯盆地陕北地区延长组致密砂岩储层为研究对象，在岩石学、孔隙结构、储层物性特征研究的基础上，开展储层敏感性流动实验，以此评价该地区致密储层的敏感性及敏感机制。研究结果表明：陕北地区延长组致密砂岩储层敏感性主要表现为中等偏强速敏、中等偏弱水敏、无酸敏到弱酸敏、弱碱敏、强压敏；临界流速、临界矿化度、临界pH值3个特征临界值分别为1.0 mL/min、8 500 mg/L、8.5。敏感程度主要受矿物成分和孔隙结构的影响。研究区储层速敏的形成源于其孔隙填隙物——高岭石的存在；绿／蒙混层及伊/蒙混层矿物是引起水敏及盐敏的主要因素；铁白云石及含铁绿泥石等酸敏矿物的存在使部分岩样显弱酸敏；极其复杂的孔喉结构、极易受压变形的片状喉道以及岩样中云母、黏土等塑性矿物导致储层具强压敏性。

关键词: 敏感性, 致密砂岩, 延长组, 陕北地区, 鄂尔多斯盆地

Abstract: Taking the tight sandstone reservoir of the Yanchang Formation in the northern Shaanxi as an example, and based on the reservoir characteristics about lithology, pore texture and physical properties, the core flow tests on reservoir sensitivities were conducted. Based on the results, the tight sandstone reservoir of the Yanchang Formation showed medium to strong velocity sensitivity, medium to weak water sensitivity, nil to weak acid sensitivity, weak alkali sensitivity,and strong pressure sensitivity. The results also gave three critical values:the critical velocity of 1.0 mL/min, the critical salinity of 8 500 mg/L, and critical pH of 8.5. Sensitivity is mainly affected by mineral composition and pore structure. The velocity sensitivity is the result of kaolinite in pores; chlorite/montmorillonite interstratified mineral and illite/montmorillonite interstratified mineral are the main factor causing water sensitivity and salt sensitivity; ankerite and iron-containing chlorite make part of the samples weakly acid sensitive; extremely complicated pore structure, easily compressed flake throat and plastic minerals in samples, such as mica and clay are the main controlling factors on the reservoir pressure sensitivity. The results provides theoretical basis for the subsequent development in the studied area.

Key words: sensitivity, tight sandstone, Yanchang Formation, Shanbei area, Ordos basin

中图分类号:

P618.13

王玉霞, 周立发, 焦尊生, 尚庆华, 黄生旺. 鄂尔多斯盆地陕北地区延长组致密砂岩储层敏感性评价[J]. 吉林大学学报(地球科学版), 2018, 48(4): 981-990.

Wang Yuxia, Zhou Lifa, Jiao Zunsheng, Shang Qinghua, Huang Shengwang. Sensitivity Evaluation of Tight Sandstone Reservoir in Yanchang Formation in Shanbei Area, Ordos Basin[J]. Journal of Jilin University(Earth Science Edition), 2018, 48(4): 981-990.

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鄂尔多斯盆地陕北地区延长组致密砂岩储层敏感性评价

Sensitivity Evaluation of Tight Sandstone Reservoir in Yanchang Formation in Shanbei Area, Ordos Basin

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