低孔低渗砂岩核磁共振测井物性评价下限及温压特性实验研究  

Experimental Study on the lower limit of nmr logging physical evaluation and temperature-pressure characteristics of low-porosity and low-permeability sandstone

作　　者：魏玺 王贵文[1] 王猛[2] 董宇 WEI Xi;WANG GuiWen;WANG Meng;DONG Yu(China University of Petroleum(Beijing),Beijing 102249,China;China Oilfield Services Limited,Langfang 065201,China)

机构地区：[1]中国石油大学(北京),北京102249 [2]中海油田服务股份有限公司,廊坊065201

出　　处：《地球物理学进展》2024年第5期1979-1988,共10页Progress in Geophysics

摘　　要：随着勘探开发对象及测量环境的日益复杂,核磁孔隙度与地层真实孔隙度存在一定偏差,高温高压的测量环境使得核磁共振响应特征不明确,这种现象影响了核磁共振测井的应用效果.为探究地层因素对核磁共振测井评价的影响,在X区块钻取了15块低孔低渗砂岩岩心,通过对比核磁孔隙度、渗透率与实际岩心孔隙度、渗透率的误差,明确了核磁共振测井评价物性的下限;此外,参考X区块H组的岩性,试制了一批人造岩心,饱和不同流体进行变温压核磁共振实验,实验结果表明温度对一维、二维核磁共振评价造成不同程度的影响,压力对核磁共振测井评价基本无影响,同时制作了T2几何均值温度校正图版,确定了饱和水砂岩T2几何均值校正模型的各项参数.With the increasing complexity of exploration and development objects,as well as measurement environment,there is a certain deviation between the nuclear magnetic porosity and the real formation porosity,and the high temperature and high pressure measurement environment makes the NMR response characteristics unclear,which affects the application of NMR logging.In order to explore the influence of formation factors on the evaluation of NMR logging,15 low-porosity and low-permeability sandstone cores were drilled in Block X.By comparing the errors of nuclear magnetic porosity and permeability with the actual core porosity and permeability,the lower limit of NMR logging evaluation was determined.In addition,with reference to the lithology of H group in Block X,a batch of artificial cores were produced on a trial basis,and variable temperature pressure NMR experiments were carried out when saturated with different fluids.The experimental results showed that temperature had different degrees of influence on one-dimensional and two-dimensional NMR evaluation,while pressure had basically no influence on NMR logging evaluation.Meanwhile,T2 geometric mean temperature correction charts were prepared.The parameters of T2 geometric mean correction model for saturated water sandstone are determined.

关 键 词：核磁共振测井 地层因素 物性下限 温压影响 校正模型 

分 类 号：P631[天文地球—地质矿产勘探]