微波辐射对泥页岩孔隙发育的影响——以松辽盆地青山口组一段为例  

Effect of microwave radiation on shale pore development:A case study of the first Member of the Qingshankou Formation,Songliao basin

作　　者：王民[1,2] 唐育龙 邓仔晓 乔宏亮 张宇辰 潘宝昕 WANG Min;TANG Yulong;DENG Zixiao;QIAO Hongliang;ZHANG Yuchen;PAN Baoxin(State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong 266580,China;School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Exploration and Development Research Institute of PetroChina Daqing Oilfield Co Ltd,Daqing,Heilongjiang 163712,China;Oil Production Plant,PetroChina Changqing Oilfield Company,Qingyang,Gansu 745100,China)

机构地区：[1]深层油气全国重点实验室,中国石油大学(华东),山东青岛266580 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [4]中国石油长庆油田分公司第二采油厂,甘肃庆阳745100

出　　处：《地质学报》2024年第10期3094-3105,共12页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号42072147、41922015);中央高校基本科研业务费(编号22CX07001A)联合资助的成果。

摘　　要：页岩油被认为是我国油气能源的革命者,其中中低熟页岩油资源潜力巨大。原位加热转化是中低熟页岩油有效开发的潜在技术。本文对松辽盆地青山口组一段富有机质泥页岩开展了常规加热和微波辐射加热实验,并结合场发射扫描电镜、低温氮气吸附实验,系统对比了微波辐射和常规加热页岩时孔隙结构与演化特征。结果表明:有机孔的演化主要经历了开孔→孔隙合并→形成复合孔隙及裂缝三个阶段,加热相同温度时微波辐射能够促进有机质裂解形成有机孔,对微裂缝的发育具有明显的促进作用;随温度增加,孔隙结构参数变化复杂,孔径先增后降,孔体积和比表面积呈增加→降低→增加的特征;随微波辐射加热时间的增加,小于50 nm的孔隙体积大幅减小,中大孔体积明显增加,表明小孔隙逐渐扩张、合并并演变成大孔。微波辐射对页岩孔隙空间改善效果更显著,裂缝更发育,利于油气渗流,但同时发现微波辐射加热的功率过高、时间过长时将会破坏孔隙,不利于改善页岩微观孔隙空间。本项研究对于中低熟页岩油原位加热方式选择及加热过程中微观孔裂隙演化认识有一定的帮助。Shale oil is revolutionizing the oil and gas energy in our country,and the resource potential of medium-and low-maturity shale oil is immense.In situ heating presents a promising technology for the effective development of these resources.This paper investigates the effects of conventional heating and microwave radiation heating on the organic-rich shale of the first Member of the Qingshankou Formation in the Songliao basin.We combined field emission scanning electron microscopy and low-temperature nitrogen adsorption experiments to systematically compare the pore structure and evolution characteristics of shale under microwave radiation and conventional heating.Our results show that the evolution of organic pores proceeds through three stages:pore opening,pore merging,and the formation of complex pores and fractures.Microwave radiation accelerates organic matter cracking at a given temperature,leading to the formation of organic pores and significantly promoting the development of micro-fractures.As temperature increases,pore structure parameters exhibit complex changes.Pore size initially increases and then decreases,whereas pore volume and specific surface area follow an increase-decrease-increase pattern.With prolonged microwave heating,the volume of pores smaller than 50 nm decreased significantly,while the volume of large pores increased substantially.This indicates that smaller pores gradually expand,merge,and evolve into larger pores.Microwave radiation demonstrates a more pronounced effect on enhancing shale pore space,resulting in more developed fractures,which are conducive to oil and gas seepage.However,excessively high microwave heating power and prolonged heating times can lead to pore destruction,hindering the improvement of shale microscopic pore space.This study provides valuable insights into the selection of in situ heating methods and the understanding of micro-porosity and fracture evolution during the heating process of medium-and low-maturity shale oil.

关 键 词：中低熟页岩油 微波辐射 原位转化 孔隙结构 青山口组一段 松辽盆地 

分 类 号：P618.13[天文地球—矿床学]