元素录井技术在渤海潜山岩性识别中的应用

Application of Element Logging Technology in Identifying Buried Hill Lithologies in Bohai Sea

针对渤海潜山岩性复杂且难以识别的问题,利用潜山元素录井资料,结合钻井、岩心、全岩分析等数据,建立了渤海海域潜山岩性-元素数据库,并通过分析对比不同潜山岩性的元素含量差异,提取了潜山各类岩性的敏感元素,运用敏感元素含量交会图的方法,建立了3类主要岩性的元素区分图版和火山岩、碳酸盐岩的元素成分命名图版。实例应用结果表明,图版的岩性解释结果准确率可达80%以上。该研究成果对提高潜山油气勘探的成功率具有重要意义。

For solving the problem that the buried hill lithologies in the Bohai Sea ai＇e complex and hard to identify, we utilized element logging data and relevant data （ drilling, core and whole-rock analysis etc. ） of the buried hill to establish a lithology-element database of the buried hill in the Bohai Sea. By analyzing and comparing the ele- ment content differences of various lithologies in the buried hill, we extracted the sensitive elements of various li- thologies in the buried hill. We applied the m^ossplot method of the sensitive element contents to establish element distinguishing plate of three major lithologies, and set up a naming plate of the elemental compositions in volcanic rock and carbonate rock. The application result of a case study shows that the precision ratio of the lithology inter- pretation by these plates can be up to 80%. This study result has great significance for improving the success rate of petroleum exploration in buried hills.