钻井地层划分方法在天津地区青白口系中的应用

APPLICATION OF GEOPHYSICAL LOGGING METHOD IN STRATIGRAPHIC DIVISION OF QINGBAIKOUAN SYSTEM IN TIANJIN REGION

地热钻井岩屑的细小且混杂,给地层的准确判断和划分带来了很大的困难.针对天津地区青白口系层型剖面的岩性组合特征及标志特征,探讨了岩屑录井、钻时录井的相关技术方法.通过研究岩性与钻时、岩性与电性的对应关系,总结了青白口系的钻时曲线特征和测井曲线标志特征.在区域地层特征的基础上,利用岩屑录井和钻时录井资料,结合物探测井曲线,可以准确划分出青白口系各组分层界线.

Accurate judgment and division of strata are difficult due to the tiny and mixed geothermal drilling cuttings. According to the lithologic assemblage and marking characteristics of Qingbaikouan stratotype profile in Tianjin region, the paper discusses the relevant technical methods of cutting logging and drilling-time logging. The characteristics of drilling time curves and logging curves of Qingbaikou System are summarized by studying the corresponding relationships between lithology and drilling time, as well as lithology and electrical property. The stratigraphic boundaries of each formation of Qingbaikou System can be accurately defined on the basis of regional stratigraphic characteristics, cutting logging and drilling-time logging data, combined with the geophysical logging curves.