利用测井曲线自动划分层序地层的方法研究

A study on the method for the division of sequence stratigraphy automatically using well logs

目的根据已有测井资料和基准面旋回原理来实现计算机自动划分高分辨率层序地层。方法通过自然伽马测井曲线计算出泥砂比、砂泥比曲线,然后利用这些曲线求出地层短期基准面变化曲线,最后根据短期基准面变化曲线划分出不同级别的层序。结果测井曲线为地层基准面旋回的自动识别提供了可靠信息,在鄂尔多斯盆地部分区块进行了应用,取得了较好的效果,为层序地层划分提供了有效的工具。结论在层序分析过程中,利用这一技术实现了层序地层划分计算机化,极大地提高了高分辨率层序地层划分的精度和效率。

Aim To divide automatically high-resolution sequence stratigraphy in computer using well loggs and datum plane gyration. Methods It can find out the shale/sand ratio curve and sand/shale ratio curve based on well loggs, then calculate short-term datum plane gyration curve, finally divide different level sequence. Results Well loggs can provide some dependable information of recognizing automatically datum plane gyration. Application in Ordos Basin of China demonstrates that it has a great effect and is a good tool in the sequence study. Conclusion In analysis of sequence, the technique can make dividing sequence stratigraphical stratigraphy computerized, and improve highly the accuracy and efficiency of the division of high-resolution sequence stratigraphy.