应用核磁共振技术研究正韵律油藏动用规律  

Study on Swept Pore Volume Percentage for Positive Rhythm Reservoirs by Using NMR

作　　者：刘凡[1] 姜汉桥[1] 贾俊山[2] 李俊键 肖康[1] 

机构地区：[1]石油工程教育部重点实验室中国石油大学(北京),北京102249 [2]中石化胜利油田分公司,山东东营257015 [3]中油勘探开发研究院,北京100083

出　　处：《特种油气藏》2012年第6期130-133,148,共4页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"大型油气田及煤层气开发研究"课题5"西非;亚太及南美典型油气田开发关键技术研究"子课题"西非深水油田注采优化及高效开发模式研究"(2011ZX05030-005-05)

摘　　要：胜利孤岛油田是一个高渗透、高饱和的河流相正韵律沉积的疏松砂岩油藏。根据Ng5-6砂层正韵律厚油层渗透率分布特征及实际注采状况,利用物理模拟手段和核磁共振技术研究水平井开采后微观剩余油分布规律,并分析低、中、高渗透层的孔隙动用程度。实验结果表明,水平井开发可以有效控制高含水期顶部剩余油,尤其是主流线区和以水平井为中心的区域,中心区对采出程度的贡献最大且主要集中在高含水期。高含水期中—大孔隙相对含油饱和度分布较平均,而小孔隙相对含油饱和度分布变化很大。水驱过程中优先动用的是中—大孔隙中的原油,当开发至相对含油饱和度为38%时,开始动用小孔隙中的原油;当相对含油饱和度小于25%时,由于小孔隙的渗吸作用,小孔隙的动用程度甚至大于中—大孔隙。Gudao Oilfield of Shengli is a fluvial rhythm reservoir deposited in positive rhythm under fluvial facies with high permeability and high oil saturation.The paper presents the study on residual oil saturation distribution after the oilfield is recovered by using horizontal wells and analyzes swept pore volume percentage for low,moderate and high permeability formations respectively by means of physical simulation and NMR.The experiment results show that the horizontal wells can effectively control the residual oil on top region during high water cut period,especially control the region of main stream line and around horizontal wells;and recovered percentage is mostly contributed by centre region and is mainly in high water cut period.Oil saturation is distributed uniformly in moderate to large pores,however,oil saturation varies greatly in small pores during high water cut period.During water flooding,the oil in large pores is preferentially swept;when oil saturation becomes 38%,the oil in small pores is swept;and when oil saturation gets to 25%,the swept percentage for small pores is even greater than in large pores due to imbibition of small pores.

关 键 词：正韵律油藏 核磁共振 高含水期 孔隙动用程度 剩余油分布 

分 类 号：TE357.44[石油与天然气工程—油气田开发工程]