应用FMI成像测井识别钙质结核及意义

结核属于一种矿物集合体,对于查明所赋存沉积物的沉积环境、沉积特征及演化历史等方面有重要意义,以往对于露头中出现的结核研究较为成熟。而对于井下发育的结核,缺乏有效手段对其形态、形成阶段及数量进行全面认识,致使结核理论在地质分析应用中受到极大限制。充分利用FMI成像测井纵、横向分辨率高、井眼覆盖率高、图像清晰等特点,对珠江口盆地琼海凸起珠江组大量发育的钙质结核形态及形成阶段做了详细研究,为认识研究区沉积环境及演化规律起到积极意义,同时也证明FMI成像测井资料为识别井下地层中发育的结核提供了一种有效手段。

Recognition of caliche nodule using FMI electric imaging logging data and its implications

Nodule is an aggregate of minerals which is significant in revealing sedimentary environment,sedimentary characteristics and evolution history.Study of nodule appearing in the outcrop is comparatively mature in the past.However,there is no available method to research comprehensively the shape,forming stage and amount of nodule which is located in wellbore,so the application of concretion theory is greatly limited in geology analysis.This article fully makes use of FMI data with high vertical and horizontal resolution,high coverage of wellbore and clear images to study the forming stage and the shape of the caliche nodule of Zhujiang group at Qionghai uplift,Zhujiangkou Basin,and also have positive significance in understanding the sedimentary environment and sedimentary evolution of the region of interest.Meanwhile,it is demonstrated that FMI electric imaging logging provided a new approach to study nodule of wellbore.