基于核磁共振技术的大庆油田X6东区剩余油分布特征研究  

Study on distribution characteristics of residual oil in eastern X6 block of Daqing Oilfield based on nuclear magnetic resonance

作　　者：刘成 王栋[3] 柳雪青 李洋冰 马立涛 尹彦君[1,2] 白瑞婷 张波[1,2] 胡维强 陈建奇[4] 冯家智 LIU Cheng;WANG Dong;LIU Xueqing;LI Yangbing;MA Litao;YIN Yanjun;BAI Ruiting;ZHANG Bo;HU Weiqiang;CHEN Jianqi;FENG Jiazhi(CNOOC Ener Tech-Drilling & Production Co., Tianjin 300452, China;CNOOC Energy Technology & Services Limited Key Laboratory for Exploration & Development of Unconventional Resources, Tianjin 300452, China;Geological Research Institute, Western Drilling,PetroChina, Xinjiang Karamay 834000, China;College of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;No.4 Oil Production Factory, PetroChina Daqing Oilfield Company Limited, Heilongjiang Daqing 163511, China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452 [2]中海油能源发展股份有限公司非常规勘探开发重点实验室,天津300452 [3]中国石油西部钻探地质研究院,新疆克拉玛依834000 [4]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [5]大庆油田第四采油厂,黑龙江大庆163511

出　　处：《非常规油气》2022年第3期96-102,共7页Unconventional Oil & Gas

基　　金：中国海油石油集团公司项目“非常规油气勘探开发实验平台建设”(CNOOC-KJPTGCJS2016-01);中海油能源发展股份有限公司重大科技专项“南海油田增储上产配套技术研究与应用”(HFZXKT-GJ2020-02-02)。

摘　　要：针对老油田可动用储量严重下滑的情况,以大庆油田X6东区开发油层为研究对象,将核磁共振技术与水驱油实验相结合,开展剩余油含量及其分布特征评价,为大庆油田X6东区主力油层的剩余油挖潜和其余非主力油层勘探开发提供依据。研究结果表明岩心渗透率是影响水、油可动流体分布特征的重要因素;束缚水状态下含油饱和度为61.3%~74.9%,T2谱图几乎呈单峰形态,油体主要分布于T2弛豫时间大于10 ms的大孔隙中,渗透率越大,含油饱和度越高;剩余油饱和度为16.4%~29.9%,主要分布于大孔隙中,被驱替出的流体相的分布空间以大孔隙为主,较大的孔道为主要渗流通道,较小的孔道成为剩余油分布的主要空间;当驱替倍数达到15 PV时,岩心中含油状态基本稳定,驱油效率为60.1%~73.2%,大孔隙对驱油效率以及采出程度的贡献要远大于小孔隙。比对X6东区开发现状,主力开发油层和非主力开发油层均具有较好的挖潜和开发潜力。In view of the serious decline of the available reserves in old oilfields,to evaluate the remaining oil content and its distribution characteristics by combining nuclear magnetic resonance technology with displacement experiment,which provides the basis for the remaining oil tapping in the main oil reservoir and the exploration and development of the non-main oil reservoir,taking the development reservoir of eastern X6 block in Daqing Oilfield as the research object.The research results show that:Core permeability is an important factor affecting the distribution of movable fluid of water and oil.Oil saturation in bound water condition ranges from 61.3%to 74.9%,the T2 spectrum is almost single-peaked,the oil is mainly distributed in large pores with T2 relaxation time greater than 10 ms,the larger the permeability,the higher the oil saturation.The residual oil saturation ranges from 16.4%to 29.9%,mainly distributed in large pores,the distribution space of the displaced fluid phase is dominated by large pores,larger pore channels are the main seepage channels,and smaller pore channels become the main space for residual oil distribution.When the replacement multiplier reaches 15 PV,the oil-bearing state in the core is basically stable,and the oil-drive efficiency ranges from 60.1%to 73.2%.The contribution of large pore space to the oil-drive efficiency and the degree of recovery is much larger than that of small pore space.Comparing the current development status in eastern X6 block,the main oil reservoir and non-main oil reservoir have potential to be tapped and developed.

关 键 词：核磁共振 水驱油 束缚水 剩余油 饱和度 驱油效率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]