元素录井分析在复杂构造带超深钻井地层识别的应用——以准噶尔南缘中段上侏罗统-下白垩统为例  

Application of Elemental Logging Analysis in Identification of Ultra-deep Drilling Strata in Complex Structural Zones:A Case Study of Upper Jurassic-Lower Cretaceous in the Middle Part of the Southern Margin of Junggar

作　　者：古榕 朱锐[1] 袁波[2] 冀冬生[2] 王泽宇 GU Rong;ZHU Rui;YUAN Bo;JI Dong-sheng;WANG Ze-yu(School of Geosciences,Yangtze University,Wuhan 430100,China;Geophysics Institute,Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Urumqi 830013,China)

机构地区：[1]长江大学地球科学学院,武汉430100 [2]中国石油新疆油田分公司勘探开发研究院地球物理研究所,乌鲁木齐830013

出　　处：《科学技术与工程》2023年第1期155-164,共10页Science Technology and Engineering

基　　金：国家自然科学基金(42130813)。

摘　　要：准噶尔盆地南缘中段下组合地层总体埋藏深度为6000~7000 m,构造条件复杂,常规地层岩性识别依靠人为判定,缺乏定量判定标准。元素录井对岩屑样品的元素含量进行检测,为岩性和地层定量识别提供了数据基础。以准噶尔盆地南缘中段为例,在上侏罗统的喀拉扎组和下白垩统的清水河组超深地层中获取627个岩屑样品,利用手持式X射线荧光光谱仪对岩屑元素含量进行检测。通过元素箱型图和图谱分析建立元素的含量与岩性对应关系,对敏感性元素的含量进行交会分析,建立不同岩性元素定量标准,探讨标志层的元素定量特征。结果表明,样品的SiO_(2)和Fe含量与岩性相关性强,其中Fe含量与泥质含量呈正相关性;SiO_(2)含量与砂质含量呈正相关性。SiO_(2)含量与Fe含量之比大于24.53为砂岩,两者含量之比小于等于24.53为泥岩。岩屑的Ca元素含量突增是清水河组和喀拉扎组分界标志。元素录井分析实现了准噶尔南缘中段上侏罗统-下白垩统复杂构造带超深钻井地层岩性和地层定量判别,为山前复杂构造带的构造解释提供新依据。The overall burial depth of the lower assemblage strata in the middle part of the southern margin of Junggar Basin is 6000~7000 m,and the structural conditions are complex.The conventional identification of stratigraphic lithology depends on artificial determination and lacks quantitative determination standard.Elemental logging was used to detect the elemental content of cuttings,which provided a data basis for the quantitative identification of lithology and strata.Taking the middle southern margin of the Junggar Basin as an example,627 rock cuttings samples were obtained from the ultra-deep strata of the Upper Jurassic Karaza Formation and the Lower Cretaceous Qingshuihe Formation,and the contents of cuttings elements were detected by handheld X-ray fluorescence spectrometer.The corresponding relationship between the content of elements and lithology was established through element box diagram and atlas analysis,and the content of sensitive elements was cross-analyzed to establish quantitative standards of different lithology elements,and the quantitative characteristics of elements in the marker layer were discussed.The results show that the content of SiO_(2)and Fe is strongly correlated with lithology,and Fe content is positively correlated with mud content.There is a positive correlation between SiO_(2)content and sand content.If the ratio of SiO_(2)to Fe content of cuttings is more than 24.53,it is sandstone.If the ratio of SiO_(2)to Fe content is less than or equal to 24.53,it is mudstone.The increase of Ca content in cuttings is the boundary mark of Qingshuihe Formation and Kalaza Formation.Elemental logging analysis has realized the quantitative identification of ultra-deep drilling strata lithology and strata in the Upper Jurassic-Lower Cretaceous complex structural belt in the middle part of the southern margin of Junggar,provides a new basis for the structural interpretation of the complex structural belt in piedentes.

关 键 词：元素录井 岩性识别 地层识别 准噶尔南缘中段 

分 类 号：TE132[石油与天然气工程—油气勘探]