元素组合解释图板在潜山界面识别中的应用

Application of interpretation chart of element combination in buried hill interface identification

X射线元素录井可检测到地层中多种元素。为充分发挥元素录井在潜山界面识别中的作用,对其检测的原始元素数据进行统计分析,归纳了研究区元素含量分布、相关性和多解性的特征,进一步结合研究区由厚层砂泥岩钻进潜山时矿物含量的变化规律,筛选一些主要元素为研究对象,将其组成3对元素曲线道,分别代表火成岩、沉积岩和沉积间断特征,进而建立元素曲线组合解释图板和Si+Al与Na+K潜山岩性解释图板。以上图板指示的潜山界面特征明显,在渤中凹陷某区块潜山界面识别中准确率达到90%,取得了较好的应用效果。

X-ray element logging can detect multiple elements in the stratum.To give full play to the roll of element logging in identifying buried hill interface,statistical analysis of original element data detected by it was conducted,element content distribution,correlation and multiplicity of solution in research area were summed up.The variation rule of mineral content when drilling into the buried hill from thick sand mudstone in research area was further combined.Certain main elements were chosen as research objects and were formed three pairs of element curve tracks,representing the characteristics of igneous rocks,sedimentary rocks and sedimentary hiatus to build the interpretation chart of element curve combination and the interpretation chart of Si+Al and Na+K buried hill lithology.Characteristics of buried hill indicated by charts above were obvious and the precision in buried hill interface identification in a block of Bozhong depression reached 90%,achieving good application effect.