时频分析方法在识别河流相层序中的应用

苏里格气田上古生界石盒子组具有典型的内陆河流相沉积特征,传统的地层划分以等厚地层为原则,具有穿时性。以高分辨率层序地层学原理和米兰科维奇旋回理论为指导,利用钻井岩心与测井资料,采用时频分析技术,建立了苏里格气田石盒子组等时地层格架,并将典型井划分出4个中期旋回、9个短期旋回及22个超短期旋回,为河流相层序划分提供了一种新的理论方法,对河流相油气藏多级层序划分具有指导意义,并进一步论证了地质时期米兰科维奇旋回存在的可能性。

Application of time-frequency analysis technique to recognition of fluvial facies sequence

The sedimentary facies of Neopaleozoic Shihezi Formation in Sulige Gas Field is fluvial facies. Traditional stratigraphic division is generally using the principle of formation thickness, which always does not have isochronous. Under the guidance of high resolution sequence stratigraphy principle and Milankovitch cycle theory, based on core and logging data, this paper established isochronous stratigraphic framework of Shihezi Formation in Sulige Gas Field by using time-frequncy analysis technique, and divided four middle-term cyclic sequences, nine short-term cyclic sequences and 22 super-short term cyclic sequences, which provides a new method for fluvial sequence division, has significant guideline for dividing sequence of fluvial reservoir, and further certifies the Milankovitch cycle theory.