石油勘探与开发 >

2019 , Vol. 46 >Issue 2: 312 - 321

DOI: https://doi.org/10.11698/PED.2019.02.11

油气勘探

松辽盆地北部致密砂岩储集层原油可动性影响因素

  • 冯军 ,
  • 张博为 ,
  • 冯子辉 ,
  • 王雅春 ,
  • 张居和 ,
  • 付晓飞 ,
  • 孙永河 ,
  • 霍秋立 ,
  • 邵红梅 ,
  • 曾花森 ,
  • 曲斌 ,
  • 迟换元
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  • 1.东北石油大学地球科学学院,黑龙江大庆 163318;
    2.黑龙江省致密油和泥岩油成藏研究重点实验室,黑龙江大庆 163712;
    3.大庆油田有限责任公司勘探开发研究院,黑龙江大庆 163712
冯军（1992-）,男,内蒙古赤峰人,现为东北石油大学地球科学学院在读博士研究生,主要从事油气藏与资源评价方面研究。地址：黑龙江省大庆市高新技术产业开发区学府街99号,东北石油大学地球科学学院,邮政编码：163318。E-mail: 408298107@qq.com

收稿日期: 2018-09-14

  网络出版日期: 2019-02-13

基金资助

中国石油天然气股份有限公司科学研究与技术开发项目“大庆探区非常规油气实验技术研究”（2012E-2603-06）; 黑龙江省博士后资助项目“不同时期油源断裂输导油气优势路径及其分布”

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Crude oil mobility and its controlling factors in tight sand reservoirs in northern Songliao Basin, China

  • FENG Jun ,
  • ZHANG Bowei ,
  • FENG Zihui ,
  • WANG Yachun ,
  • ZHANG Juhe ,
  • FU Xiaofei ,
  • SUN Yonghe ,
  • HUO Qiuli ,
  • SHAO Hongmei ,
  • ZENG Huasen ,
  • QU Bin ,
  • CHI Huanyuan
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  • 1.College of Earth Science, Northeast Petroleum University, Daqing 163318, China;
    2.Heilongjiang Provincial Key Laboratory for the Study of Tight Oil and Shale Oil Accumulation, Daqing 163712, China;
    3.Exploration and Development Research Institute, Daqing Oilfield Company Ltd., Daqing 163712, China

Received date: 2018-09-14

  Online published: 2019-02-13

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摘要

以松辽盆地北部上白垩统青山口组高台子和扶余油层致密油为例,在核磁共振、高压压汞等分析的基础上,首次采用二氧化碳超临界驱替和超临界萃取实验方法,对不同岩性、不同含油级别的致密砂岩储集层原油可动性开展了定量研究。实验表明,在模拟松辽盆地北部致密油储集层温度76~89 ℃、压力35~42 MPa地层条件下,可动油启动时的孔隙度下限为4.4%,渗透率下限为0.015×10-3 μm2,平均孔喉半径下限为21 nm。提出了致密砂岩储集层3种类型划分标准,Ⅰ类储集层可动流体饱和度大于40%,可动油率（可动油量占总油量的比）大于30%,启动压力梯度为0.3~0.6 MPa/m;Ⅱ类储集层可动流体饱和度为10%~40%,可动油率为5%~30%,启动压力梯度为0.6~1.0 MPa/m;Ⅲ类储集层可动流体饱和度一般小于10%,可动油率小于5%,启动压力大于1.0 MPa/m。致密砂岩储集层流体可动性主要受成岩作用和沉积作用影响,埋深小于2 000 m时以Ⅰ类储集层为主,大于2 000 m时主要为Ⅰ类、Ⅱ类储集层;三角洲内前缘相Ⅰ类储集层发育,三角洲外前缘和滨浅湖相以Ⅱ、Ⅲ类储集层为主。图5表3参36

关键词： 松辽盆地北部; 致密油; 孔隙结构; 原油可动性; 驱替实验; 可动油率; 上白垩统青山口组

本文引用格式

冯军 , 张博为 , 冯子辉 , 王雅春 , 张居和 , 付晓飞 , 孙永河 , 霍秋立 , 邵红梅 , 曾花森 , 曲斌 , 迟换元 . 松辽盆地北部致密砂岩储集层原油可动性影响因素[J]. 石油勘探与开发, 2019 , 46(2) : 312 -321 . DOI: 10.11698/PED.2019.02.11

Abstract

Taking tight oil in Gaotaizi and Fuyu oil layers of the Upper Cretaceous Qingshankou Formation in northern Songliao Basin as an example, based on analyses of nuclear magnetic resonance and high pressure mercury injection, experiment methods of supercritical carbon dioxide displacement and extraction are firstly employed to quantify crude oil mobility in tight sand reservoirs with different lithologies and oil contents. The results show that, under the conditions of simulating the Cretaceous Qingshankou Formation in the northern part of the Songliao Basin at a temperature of 76-89 ℃ and a pressure of 35-42 MPa, the lower limit of the porosity of the movable oil is 4.4%, and the lower limit of the permeability is 0.015×10-3 μm2. The lower limit of the average pore throat radius is 21 nm. On this basis, a classification standard for three types of tight sand reservoirs is proposed. Type I reservoirs are characterized by the movable fluid saturation larger than 40%, the movable oil ratio (ratio of movable oil to total oil) greater than 30% and the starting pressure gradient in the range of 0.3-0.6 MPa/m; Type II reservoirs are characterized by the movable fluid saturation in the range of 10%-40%, the movable oil ratio in the range of 5%-30% and the starting pressure gradient in the range of 0.6-1.0 MPa/m; Type III reservoirs are characterized by the movable fluid saturation less than 10% in general, the movable oil ratio less than 5%, and the starting pressure gradient greater than 1.0 MPa/m. The fluid mobility in tight sand reservoirs is mainly affected by diagenesis and sedimentary environment. Reservoirs with depth lower than 2 000 m are dominated by type I reservoir, whereas those with greater depth are dominated by type I and II reservoirs. Reservoirs in inner delta-front facies are dominated by type I reservoir, whereas those in outer delta-front facies and shore-shallow lacustrine facies are dominated by type II and III reservoirs.

Key words： northern Songliao Basin; tight oil; pore structure; crude oil mobility; displacement experiment; movable oil ratio; Upper Cretaceous Qingshankou Formation

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