低渗致密砂岩油藏水驱储层变化规律

石立华; 师调调; 廖志昊; 薛颖; 李禄胜

doi:10.3969/j.issn.1006-6535.2024.03.014

特种油气藏 >

2024 , Vol. 31 >Issue 3: 106 - 115

DOI: https://doi.org/10.3969/j.issn.1006-6535.2024.03.014

油藏工程

低渗致密砂岩油藏水驱储层变化规律

石立华 ,
师调调 ,
廖志昊 ,
薛颖 ,
李禄胜

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1.陕西延长石油(集团)有限责任公司,陕西西安 710065;
2.陕西省特低渗透油气勘探开发工程技术研究中心,陕西西安 710065;
3.中国石油长城钻探工程有限公司,辽宁盘锦 124010;
4.西安思坦仪器股份有限公司,陕西西安 710065

石立华(1983—),男,教授级高级工程师,2007年毕业于长江大学石油工程专业,2022年毕业于中国石油大学(北京)油气田开发工程专业,获博士学位,现从事油藏工程理论及注水开发调控研究。

师调调(1984—),女,高级工程师,2007年毕业于吉林大学地质学专业,2012年毕业于西北大学油气田地质与开发专业,获博士学位,现从事页岩油微观孔隙结构及提高采收率技术研究工作。

收稿日期: 2023-07-13

修回日期: 2024-04-10

网络出版日期: 2024-07-26

基金资助

陕西省自然科学基础研究计划“致密砂岩储层微观孔喉结构及薄膜流动对渗吸规律的影响”(2023-JC-YB-423)、“页岩油储层微—纳米孔喉系统量化表征及对可动流体赋存状态控制机理研究”(2022JQ-290);延长石油集团科技攻关项目“延长西部油区长6油藏不稳定周期注水机理及技术政策研究”(ycsy2022jcts-B-32)

收起

The Variation Law of Water Flooding Reservoir in Low Permeability Tight Sandstone Reservoirs

Shi Lihua ,
Shi Tiaotiao ,
Liao Zhihao ,
Xue Ying ,
Li Lusheng

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1. Shaanxi Yanchang Petroleum (Group) Co., Ltd, Xi′an, Shaanxi 710065, China;
2. Engineering Technology Research Center of Ultra-low Permeability Oil and Gas Exploration and Development, Xi′an, Shaanxi, 710065, China;
3. CNPC Greatwall Drilling Company, Panjin, Liaoning, 124010, China;
4. Xi′an Sitan Instruments Co., Ltd, Xi′an, Shaanxi, 710065, China

Received date: 2023-07-13

Revised date: 2024-04-10

Online published: 2024-07-26

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摘要

针对低渗致密砂岩油藏水驱前后储层中黏土矿物及微观孔隙结构变化规律认识不清的问题,以鄂尔多斯盆地延长油田长2和长6储层为研究对象,运用铸体薄片、X衍射、高压压汞等实验方法,研究了储层岩石矿物类型及含量、黏土矿物类型及含量和微观孔喉结构特征,分析了水驱前后储层变化规律。研究表明:与长2低渗储层相比,长6致密储层微观非均质性更强;水驱后,长2储层中的伊/蒙混层和伊利石含量升高,绿泥石含量和伊/蒙混层比降低,长6储层中伊/蒙混层含量、绿泥石含量、伊/蒙混层比均下降;当孔喉半径较大时,注入水对孔喉起改善作用,当孔喉半径较小时,注入水对孔喉起破坏作用;岩心渗透率越大,压力传播速度越快,注入水推进速度更快,出口端更易见水。该研究可为低渗致密砂岩油藏注水开发提供技术参考。

关键词： 低渗砂岩; 致密砂岩; 水驱; 储层特征; 微观孔喉变化; 鄂尔多斯盆地

本文引用格式

石立华 , 师调调 , 廖志昊 , 薛颖 , 李禄胜 . 低渗致密砂岩油藏水驱储层变化规律[J]. 特种油气藏, 2024 , 31(3) : 106 -115 . DOI: 10.3969/j.issn.1006-6535.2024.03.014

Abstract

To address the issues of unclear understanding of the variation law of clay minerals and micro-porosity structure within low permeability tight sandstone reservoirs before and after water flooding, the Chang 2 and Chang 6 Reservoirs in Yanchang Oilfield of Ordos Basin were taken as research objects. The types and contents of rock and clay minerals, the characteristics of microscopic pore throat structure are studied by using experimental methods such as casting thin sections, X diffraction and high pressure mercury intrusion, and the variation law of reservoirs before and after water flooding was analyzed. The results show that the microscopic heterogeneity of Chang 6 tight reservoir is stronger than that of Chang 2 low permeability reservoir. After water flooding, the content of illite/Montmorillonite mixed layer and illite in Chang 2 Reservoir increased, chlorite content and illite/smectite mixed layer ratio decreased, and the content of illite/smectite mixed layer, chlorite content and illite/smectite mixed layer ratio in Chang 6 Reservoir decreased. When the pore throat radius is large, the injected water improves the pore throat. On the contrary, the pore throats are damaged by the injected water. The larger the core permeability is, the faster the pressure propagation velocity is, the faster the injected water advances, and the more water is visible at the outlet end. This study can provide technical reference for water flooding development of low permeability tight sandstone reservoirs.

Key words： low permeability sandstone; tight sandstone; water flooding; reservoir characteristics; microscopic pore throat variation; Ordos Basin

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