摘要
针对松散的岩屑样品,通过场发射扫描电镜获取岩屑大面积背散射扫描图像(MAPS),在此基础上,提出了一种基于3D距离图的分水岭算法对岩屑颗粒进行精确分割,具体步骤为:对原始照片进行特征分割,划分出颗粒相、基质相和孔隙相;对要统计的特征进行标记,如统计矿物颗粒时,需要对颗粒相进行标记;对特征属性进行计算,如颗粒大小(面积、周长等参数);对特征参数进行分组统计,如颗粒的等效直径等获取代表性的岩屑粒径分布。与室内实验粒径数据进行了比较,两者较为吻合,说明了本文算法的准确性。进而以南海东部A油田目标区块为例,利用地质过程模拟法构建了代表性的三维数字岩心,分析了储层微观孔隙结构特征。该方法有效解决了岩屑粒径测量困难的现状,可以为缺少岩心数据的老油田剩余油挖潜提供基础数据。
A large-area backscattered scanning image(MAPS)of debris can be obtained by field emission scanning electron microscopy.On this basis,a 3D distance map-based watershed algorithm was proposed to accurately segment the debris particles,and the specific steps are:conducting feature segmentation on the original photo to divide the particle phase,the matrix phase and the pore phase;marking the features required for statistics,such as marking the particle phase for mineral particles statistics;calculating the feature properties,such as particle size(area,perimeter and so on);grouping statistics of characteristic parameters,such as the equivalent diameter of the particles to obtain a representative debris particle size distribution.Compared with the particle size data of lab experiment,both the data are more consistent,indicating the accuracy of this algorithm.Taking the target block of the A oilfield in eastern South China Sea as an example,a representative 3D digital core was constructed by geological process simulation method,and the microscopic pore structure characteristics of the reservoir were analyzed.This method effectively solved the existing difficulty in the measurement of debris particle size,and it can provide basic data for the remaining oil development of old oilfields without enough core data.
作者
戴宗
罗东红
谢明英
唐放
李海龙
涂志勇
王晨晨
陈强
DAI Zong;LUO Donghong;XIE Mingying;TANG Fang;LI Hailong;TU Zhiyong;WANG Chenchen;CHEN Qiang(CNOOC China Limited,Shenzhen Branch,Shenzhen,Guangdong 518000,China;iRock Technologies Co.,Ltd.,Xiamen,Fujian 361000,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2019年第2期103-107,共5页
China Offshore Oil and Gas
基金
中国海洋石油集团有限公司"十三五"科技重大项目"双特高海相砂岩油藏精细描述及剩余油定量预测技术(编号:CNOOC-KJ 135ZDXM22 LTD02 SZ2016)"部分研究成果
关键词
岩屑样品
大面积背散射扫描
粒径分析
数字岩心
微观特征
debris samples
large area backscatter scanning
particle size analysis
digital core
microscopic features
