塔里木盆地玉北地区奥陶系鹰山组测井岩性段精细划分

Fine division of logging lithologic section in Ordovician Yingshan Formation, Yubei area, Tarim Basin

秦伟强

Qin Weiqiang

中国石油化工股份有限公司 西北油田分公司,乌鲁木齐 830011

SINOPEC Northwest Oilfield Company, Urumqi, Xinjiang 830011, China

奥陶系鹰山组是玉北地区勘探开发的热点和重点，该区鹰山组厚度大（大于500 m），区内断裂较发育，局部的构造抬升和地层剥蚀为地层划分和储层对比造成了较大的困难。该区自然伽马曲线升高，表现为“横向普遍、纵向杂乱”的特点。该文在自然伽马能谱测井和地球化学元素测井的基础上，对自然伽马能谱曲线的升高特征进行分析，并以鹰山组的岩性变化为基础，以测井曲线变化的规律特征段为桥梁，将奥陶系鹰山组自上而下分为4个岩性段，横向上4个岩性段具有较好的可对比性，为后期鹰山组的精细分析及有利勘探目标优选奠定了较好的基础。

The Ordovician Yingshan Formation (over 500 m thick) is the focus for petroleum exploration in Yubei area of the Tarim Basin. Fractures are well developed. Regional tectonic uplift and stratigraphic erosion have made it difficult for formation division and reservoir correlation. Natural gamma curve increases in the study area, and is featured by “horizontal evenness and vertical randomness”. Based on natural gamma ray spectrometry logging and geochemical element logging, the increasing feature of natural gamma ray spectrometry curve is analyzed. Combined with the changes of lithology and logging curve, the Ordovician Yingshan Formation is divided into 4 sections from top to bottom. The 4 sections have good comparability horizontally, providing good foundation for further fine analysis and potential target optimization.

https://doi.org/10.11781/sysydz2013S1008