基于核磁共振(NMR)技术进行致密储层参数研究——以鄂尔多斯盆地南部富县油田延长组长8致密储层为例  

Study on Petrophysical Parameters of Tight Reservoir Based on Nuclear Magnetic Resonance(NMR)Technique——A Case Study of Chang 8Member of Yanchang Formation,Fuxian Oilfield,Southern Ordos Basin

作　　者：郭兰[1] 丁超[2] 门艳萍[1] 朱海涛[1] 黄贤良[1] 

机构地区：[1]延长油田股份有限公司,陕西延安716000 [2]西安石油大学地球科学与工程学院,陕西西安710065

出　　处：《非常规油气》2017年第3期29-35,共7页Unconventional Oil & Gas

基　　金：陕西省教育厅专项科研计划项目"鄂尔多斯盆地东北部二叠系油气成藏的时-空序列及其物理化学参量的流体包裹体分析"(16JK1599);西安石油大学博士科研启动基金项目"鄂尔多斯盆地南部铜川地区三叠系构造热演化史"(2014BS04);延长油田股份有限公司科研项目"富县指挥部姜家川区域低孔渗测井岩石物理实验研究"(ycsy2013ky-A-01)联合资助

摘　　要：核磁共振(NMR)试验分析储层岩石物理参数是近年来兴起的一项高新技术,但由于参数确定和计算方法的不同,导致结果误差较大。本研究基于陕北富县油田延长组长8致密储层特征和岩石NMR试验分析,通过核磁信号的弛豫谱分布特征,系统获取岩心孔隙度、渗透率、束缚水饱和度等丰富的岩石物理性质信息,并与常规岩石物理参数分析相对比,探讨NMR分析技术在致密储层物理参数分析中的应用效果。结果表明:长8储层砂岩类型为长石砂岩或岩屑长石砂岩,储层物性较差,属于低-特低孔、特低-超低渗储层。NMR孔隙度具有较高精度,无明显偏差;NMR渗透率计算存在较大偏差,仍需修改完善。NMR束缚水饱和度模型中,信号比值法更适用于长8储层束缚水饱和度分析。长8储层的NMR研究为相邻地区或相似盆地的致密储层NMR分析以及物理参数改进优化提供了参考和依据。The nuclear magnetic resonance （NMR） is a high technology for petrophysical parameters analysis of the tight reservoir rock in recent years. But the parameters determination and calculation method is variety and that lead to the result error is bigger. Based on the characteristics of tight sandstone reservoir of Chang 8 member of Yan- chang formation in the Fuxian oilfield and rock NMR test analysis, this research obtained rich information about petrophysical parameters such as core porosity, core permeability, irreducible water saturation systematacially through the distribution characteristics of NMR relaxation spectra. And compared with conventional petrophysical parameters, the NMR technology application effect for petrophysical parameters analysis of the tight reservoir was discussed. The results showed that the reservoir type is feldspar sandstone or lithic feldspar sandstone and belong to low to ultra-low porosity, ultra-low permeability reservoir with poor reservoir physical property. The NMR porosity had a higher accuracy, no significant deviation, but there was a large deviation in NMR permeability, still need to modify and improve. In the NMR irreducible water saturation calculation model, the signal ratio method was more suitable for Chang 8 member reservoir. The NMR studies of Chang 8 reservoir provided a reference and basis for the NMR analysis of tight reservoir in adjacent areas or similar basins, as well as the optimization of physical parameters.

关 键 词：致密储层 长8油层组 核磁共振 岩石物理参数 

分 类 号：P618.13[天文地球—矿床学]