东营凹陷南坡古近系滩坝单元测井自动识别

A Study on Logging Automatic Recognition of Beach Bar Sedimentary Units on the Southern Slope of Dongying Depression

东营南坡古近系沙四上亚段滩坝砂体已逐步成为增储上产的重要战略勘探目标。通过总结大量滩坝现代沉积考察及录井岩心分析结果的基础上,从沉积动力的角度将滩坝划分为弱波浪作用、动荡水流–冲洗回流、风成、沼泽化等四个演化阶段,进一步细分为A至E等五个沉积结构单元。在关键井取心、常规测井及成像测井资料分析的基础上,研究滩坝各沉积单元常规测井曲线响应特征,并对曲线敏感性进行分析。根据Bayes判别分析原理,结合上述研究成果,对滩坝各结构单元建立判别公式,从而达到自动识别的目的,对下一步的勘探开发工作具有一定指导意义。

The beach bar sand-body of Es4s on the southern slope of Dongying Depression has gradually become important strategic target of increasing the reserve. On the basis of summarizing lots of modern sedimentary study and analyzing the logging and core of beach bar, it divides beach bar into four evolution stages, and they are subdivided into five sedimentary units. It analyzes well logging response of structural units of beach bar and susceptibility of logging curve according to the analysis of core, well logging and imaging logging data. Based on Bayes principle, it sets up the discriminant formula for each unit to make automatic recognition of the units, which is meaningful for exploration and exploitation of next stage.