利用高分辨率3D技术和荧光强度变化精确测量烃类包裹体体积的方法  

Accurate Determination of Volumes of Hydrocarbon Inclusions by High Resolution 3-Dimensional Technique and Varying Fluorescence Intensity

作　　者：黎萍[1,2] 徐兴友 陈勇[3] 王娟 韩冬梅 林晶 

机构地区：[1]中石化股份胜利油田分公司勘探开发研究院,山东东营257015 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油大学(华东)地球科学与技术学院,山东青岛257061

出　　处：《岩矿测试》2016年第2期159-165,共7页Rock and Mineral Analysis

基　　金：国家科技重大专项(2011ZX05006-001);国家自然科学基金资助项目(41172111);国家重点基础研究计划(973)项目(2014CB239105);中石化胜利油田科研攻关项目(YKS1401)

摘　　要：烃类包裹体气液比的精度对PVT模拟结果可靠性有重要影响,而气液相边界的判断对气液比测定准确性至关重要。本文开发了一种精确测量烃类包裹体体积的方法,即利用高分辨率激光共聚焦显微扫描技术获取烃类包裹体3D图,在透射及荧光模式下用三维坐标标定液相的边界,利用3Dfor LSM软件计算烃类包裹体液相的体积;同时利用激光共聚焦显微荧光技术对横穿气液两相的直线进行线扫描,根据扫描线上荧光强度的突变判断气相边界,多次扫描求平均值作为气相直径。本方法避免了人为判断包裹体气相边界的不可靠性,对气液边界的确定精度可达0.02μm,提高了气液比测试精度,使得利用包裹体恢复古压力结果更加可靠。The volume ratio between vapor and liquid of hydrocarbon inclusions is an important parameter for PVT simulation. Moreover, the judgment of the boundary between vapor and liquid is very important for the accuracy of the vapor/liquid ratios. A method for accurately determining the volume of hydrocarbon inclusion has been developed in this study. High resolution Laser Confoeal Scanning Microscopy was used to obtain three-dimensional images of hydrocarbon inclusions. The liquid phase boundary was determined by three-direction coordinates under transmission light and fluorescence. 3DforLSM software was used to calculate the liquid phase volumes of hydrocarbon inclusions. Line scan was carried out across the vapor and liquid boundary using Laser Confocal Fluorescence Microscopy, in order to determine the vapor phase boundary according to the change of fluorescence intensity. The average of the results from multiple scans was used as the diameter of the vapor phase. This method avoids the error of manual judgment of the vapor and liquid boundary with a precision of 0.02 p,m. The method improved the analytical precision of vapor/liquid ratios and allows for more reliable reconstruction of the trapping pressure by hydrocarbon inclusions.

关 键 词：烃类包裹体 气液比 气液相边界 高分辨激光共聚焦显微镜 荧光光谱 

分 类 号：P571[天文地球—矿物学] P575.2[天文地球—地质学]