井场薄片岩性鉴定技术在岩性及地层识别中的应用

Wellsite analysis techniques for thin-section lithology and formation identification

为了在钻井现场准确识别钻遇的复杂地层岩性,及时判断钻遇地层层位,渤海油田将实验室薄片岩性鉴定技术引进井场。通过缩小实验室薄片鉴定设备体积,并简化鉴定内容及流程,可以达到简便易行、快速准确对录井岩屑岩性进行鉴定和分析的目的。以渤海湾的两口复杂预探井为例,在钻探潜山油气藏时,利用井场薄片岩性鉴定技术准确识别出沙河街组生物碎屑灰岩、古生界灰岩和白云岩、中生界凝灰岩等,切实提高了对地层复杂岩性及疑难层位识别、判断的准确率。

In order to accurately identify formation lithology drilled on drilling site,and promptly determine the drilled strata,Bohai Oilfield introduced the laboratory thin-section lithology identification techniques into the wellsite.By reducing equipment size used for laboratory thin-section identification and simplifying the identifying contents and processes,the simple,fast and accurate purposes can be reached for identifying and analyzing cuttings′lithology of mud logging.Taking Bohai Bay′s two complex wildcat wells as examples,bioclastic limestone of Es formation,Paleozoic limestone and dolomite,and Mesozoic tuff were accurately identified by using wellsite thin-section lithology identification techniques,and the identifying and judging accuracy were effectively improved for difficult horizons and complex formation lithology.