鄂尔多斯盆地盒8段致密砂岩气藏微观孔隙结构及渗流特征

刘晓鹏, 刘燕, 陈娟萍, 胡爱平

doi:10.11764/j.issn.1672-1926.2016.07.1225

天然气地球科学 >

2016 , Vol. 27 >Issue 7: 1225 - 1234

DOI: https://doi.org/10.11764/j.issn.1672-1926.2016.07.1225

天然气地质学

鄂尔多斯盆地盒8段致密砂岩气藏微观孔隙结构及渗流特征

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1.中国石油长庆油田分公司勘探开发研究院，陕西西安 710018；
2.低渗透油气田勘探开发国家工程实验室，陕西西安 710018

刘晓鹏(1978-)，男，陕西周至人，工程师，硕士，从事天然气地质勘探研究及生产工作. E-mail:liuxiaop1_cq@petrochina.com.cn.

收稿日期: 2015-11-20

修回日期: 2016-04-01

网络出版日期: 2019-09-19

基金资助

国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(编号:2011ZX05044)资助.

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Characteristics of micro pore structure and seepage in tight sandstone gasreservoir of the 8^th section of Shihezi Formation in Ordos Basin,China

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1.Exploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi’an 710018,China;
2.National Engineering Laboratory for Low Permeability Petroleum Exploration and Development,Xi’an 710018,China

Received date: 2015-11-20

Revised date: 2016-04-01

Online published: 2019-09-19

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摘要

应用铸体薄片、恒速压汞、高压压汞、气水相渗、水锁伤害、应力敏感等分析测试技术，对鄂尔多斯盆地上古生界二叠系石盒子组盒8段储层微观孔隙结构及渗流特征进行了分析，对钻井、储层改造、气藏开发等工程工艺措施提出了针对性改进建议。结果表明:盒8气藏为致密砂岩气藏，储层孔隙半径分布曲线主峰为70～200μm，喉道半径分布曲线主峰为0.2～2.2μm，属大孔、中_细喉储层；渗透率>1×10^-3μm²、(1.0～0.5)×10^-3μm²、(0.5～0.1)×10^-3μm²、(0.1～0.01)×10^-3μm²等4个级别储层中，由半径<0.062 4μm喉道控制的孔隙体积分别占总孔隙体积的18.8%、38.4%、57.3%、71.6%，小喉道控制的孔隙体积比例高；喉道半径大小决定了储层渗透率高低，也控制了渗流特征，水锁和应力敏感是影响盒8致密砂岩储层渗流能力的主要因素；盒8气藏压力系数低，加之储层强亲水，易发生水锁伤害，气相渗透率随含水饱和度升高急剧降低；盒8段储层管束状、缩颈状喉道发育，易发生应力敏感伤害，应力敏感伤害率为40%～80%；盒8致密砂岩气藏储层改造应广泛采用体积压裂以减弱小喉道对孔隙的控制，在钻井、储层改造过程中应尽量避免使用水基工作液，多采用欠平衡作业等措施，减少或避免水基工作液侵入。开发生产过程中应尽量避免大压差生产和频繁开关井，主动排水采气，以保护储层，提高采收率。

关键词： 微观孔隙结构; 渗流特征; 致密砂岩储层; 鄂尔多斯盆地; 盒8气藏; 工程工艺措施

本文引用格式

刘晓鹏, 刘燕, 陈娟萍, 胡爱平 . 鄂尔多斯盆地盒8段致密砂岩气藏微观孔隙结构及渗流特征[J]. 天然气地球科学, 2016 , 27(7) : 1225 -1234 . DOI: 10.11764/j.issn.1672-1926.2016.07.1225

Abstract

A detailed study about the micro-pore structure and reservoir seepage characteristics was carried out on the 8th section of Shihezi Formation of Upper Palaeozoic in Ordos Basin,based on casting thin sections identification,onstant-rate mercury injection,high-pressure mercury injection,gas water phase permeability,water lock damage and stress sensitive analytical techniques,then give the improvement suggestions about drilling and reservoir reconstruction for tight sandstone gas reservoir development technology.The results are as follows:Gas reservoir in the 8^th section of Shihezi Formation is tight sandstone gas reservoir.The main peak of the pore radius distribution is between 70-200μm,and the main peak of throat radius distribution is between 0.2-2.2μm,so the reservoir belongs to big hole,medium -fine throat type reservoir.The reservoir permeability was divided into four levels,such as greater than 1millidarcy,1.0-0.5millidarcy,5-0.1millidarcy,and 0.1-0.01millidarcy.The throats whose radius is smaller than 0.062 4μm respectively takes up the18.8%,38.4%,57.3% and 71.6% pore volumes in four lever permeability,so it is obvious that the small throats take up pore volume much higher,and throat radius size determines the reservoir permeability and also controls the reservoir seepage characteristics.Water locking and stress sensitivity are the main factors that influence the He 8 section tight sandstone reservoir seepage ability.Pressure coefficient of He 8 gas reservoir is low,and hyolrophilic preperty of the reservoir is stong,prone to water locking damage,gas permeability decreases sharply with the increase of water saturation.With pipe bundle and necking shape throat development,He 8 section tight sandstone reservoir is prone to stress sensitivity damage,and the stress sensitivity damage rate of He 8 section ranges from 40% to 80%.Volume fracturing should be widely used to reduce the control of small throat for pore in reservoir reconstruction of He 8 section tight sandstone reservoir.In drilling and reservoir reconstruction process of He 8 section gas reservoir should avoid using water-based fluid and use underbalanced drilling technology,which prevent the water-based fluid invading.In development process,the tight sandstone gas reservoir should avoid great production pressure drop and frequent switch well,and active drainage gas recovery so to protect reservoir and improve gas recovery.

Key words： Microscopic pore structure; Seepage characteristic; Tight sandstone reservoir; Ordos Basin; He 8 section gas reservoir; Engineering technology measures

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