Characteristics and identification of weathering crust of Pennsylvanian volcanic rocks in Shixi area,Junggar Basin  

作　　者：HAN Junwei SHAN Xuanlong YIMING Ablimiti BIAN Baoli LIU Hailei LI Ang YI Jian 

机构地区：[1]College of Earth Sciences,Jilin University,Changchun 130061,China [2]Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

出　　处：《Global Geology》2023年第4期211-221,共11页世界地质（英文版）

基　　金：Supported by 14th Five-year Major Project of CNPC(No.2021DJ0206).

摘　　要：Based on drill core and thin section observation,major geochemical element analysis and con-ventional well log analysis,this study summarizes the characteristics and thickness of weathering crust of Pennsylvanian volcanic rocks(Carboniferous)in Shixi area,Junggar Basin.The weathering crust is identified and divided into three types according to the petrological characteristics and well log interpretations in Shixi area,and the isopach of weathering crust is mapped.The results show that:(1)With the increase of depth,the weathering weakens,and the rocks become less fractured with decreased porosity;(2)the weathering crust of the Upper Carboniferous volcanic rocks can be divided into strongly weathered and mildly weathered layers in Shixi area;(3)the weathering crust is relatively thicker in Dinan uplift and Shixi uplift.This study provides research basis for further evaluation of Upper Carboniferous volcanic reservoir,and will benefit for well location deployment and potential oilfield development in the Shixi area.

关 键 词：Junggar Basin PENNSYLVANIAN weathering crust identification and division volcanic rocks 

分 类 号：P588.14[天文地球—岩石学] P512.13[天文地球—地质学]