二维核磁共振组分定义方法在复杂岩性储层评价中的应用  

Application of 2D NMR Component Definition Method in Complex Shale Reservoir Evaluation

作　　者：高树芳 张晓秋 李贵梅 陈文安 梁晓宇 郭亚男 李庆波 魏国 GAO Shufang;ZHANG Xiaoqiu;LI Guimei;CHEN Wenan;LIANG Xiaoyu;GUO Ya;nan;LI Qingbo;WEI Guo(Research Institution of Exploration and Development,PetroChina Qinghai Oilfield Company,Dunhuang,Gansu 736202,China;Qinghai Provincial Key Laboratory of Plateau Saline-Lacustrine Basinal Oil&Gas Geology,Dunhuang,Gansu 736202,China;Beijing Huankechuangji Technology Company,Beijing 100020,China)

机构地区：[1]中国石油青海油田分公司勘探开发研究院,甘肃敦煌736202 [2]青海省高原咸化湖盆油气地质重点实验室,甘肃敦煌736202 [3]北京桓科创纪科技有限公司,北京100020

出　　处：《测井技术》2024年第2期215-220,共6页Well Logging Technology

基　　金：中国石油天然气集团股份有限公司科技重大专项“陆相页岩油规模增储上产与勘探开发技术研究”(2023ZZ15)。

摘　　要：柴达木盆地七个泉-狮北斜坡区岩心、实验资料表明E_(3)^(2)地层具有岩性复杂、纵向变化快的特点,其测井响应特征与常规油藏存在较大的差异。该类油藏具有油水同出特点,准确识别流体性质是目前测井评价亟需解决的问题。受岩性、物性、孔隙结构的影响,声波时差-深感应电阻率交会图法等常规流体识别方法对此类储层流体性质判别存在局限性。采用二维核磁共振与常规测井相结合的方法确定各组分的流体类型,即通过绘制深感应电阻率与总水孔隙体积交会图确定大孔隙中流体组分类型。应用该方法确定了柴达木盆地七个泉-狮北斜坡区新钻井W_(2)井储层流体性质,并优选射孔井段进行试油,试油日产油13 m^(3),证实了该方法适用于该类储层。新方法在一定程度上弥补了原二维核磁共振组分定义方法在流体识别方面的不足,提高了其对复杂岩性储层流体性质识别的精度,同时该方法对于其他类型储层二维核磁共振组分定义也具有一定的借鉴意义。The core and experimental data in Qigequan-Shibei slope area of the Qaidam basin show that the E_(3)^(2)formation has the characteristics of complex lithology and rapid vertical variation,and its logging response characteristics are quite different from those of conventional reservoirs.This kind of reservoir has the characteristics of oil and water flowing together,and it is an urgent problem to accurately identify the fluid properties in well log evaluation.Due to the influence of lithology,physical properties and pore structure,conventional fluid identification methods,such as acoustic time difference and deep induction resistivity crossplot method,have limitations in the identification of such reservoir fluids.Two-dimensional nuclear magnetic resonance(2D NMR)and conventional logging are used to determine the fluid types of each component,that is,types of fluid components in large pores are determined by drawing the crossplot of deep induction resistivity and total water pore volume.This method is applied to determine the reservoir fluid properties of W_(2)well,a newly drilled well in the Qigequan-Shibei slope area of the Qaidam basin.We selected the perforated well segment for oil testing,and the oil production per day is 13 m^(3),which proved the applicability of this method in this type of reservoir.The new method overcomes the shortcomings of the original 2D NMR component definition method in fluid identification,and improves the accuracy of fluid identification in complex shale reservoirs.At the same time,this method can also be used for reference to other types of 2D NMR component definition.

关 键 词：测井解释 复杂储层 页岩油藏 流体识别 核磁共振测井 T_(1)-T_(2)谱 柴达木盆地 

分 类 号：P631.84[天文地球—地质矿产勘探]