阿富汗中西部航磁异常特征及地质意义
Characteristics and geological significance of aeromagnetic anomalies in central and western Afghanistan
周磊 1张春灌 1袁炳强 1李慧敏 2赵敏 1韩梅 1张冕1
作者信息
- 1. 西安石油大学地球科学与工程学院,陕西西安 710065;西安石油大学陕西省油气成藏地质学重点实验室,陕西西安 710065
- 2. 中国石化江苏油田分公司采油二厂,江苏淮安 211600
- 折叠
摘要
阿富汗矿产资源丰富,但勘探程度较低,在分析2006 年以后完成的阿富汗中西部航磁数据的基础上,利用变磁倾角化极技术对磁力异常数据进行化极处理,采用滑动平均滤波、垂向二阶导数法对化极磁力数据进行位场转换与分离,获得了垂向二阶导数异常、区域异常及局部异常,结合地表地质信息对研究区断裂构造进行识别、对隐伏酸性岩浆岩的位置进行圈定.研究表明:研究区内太古宇和元古宇总体磁性较强,第四系、新近系、白垩系总体呈现低磁性特征;区内断裂发育,以赫拉特-恰赫恰兰一带为界,分界线以北断裂呈近东西走向,分界线以南断裂呈北东走向;岩浆岩分布与磁力异常高值对应关系良好,分布特征与区域构造特征相吻合,研究成果为阿富汗中西部的油气等资源勘探提供了地球物理依据.
Abstract
Afghanistan is rich in mineral resources,but less explored.Based on the analysis of aeromagnetic data in central and western Afghanistan since 2006,the polarization of magnetic anomaly data is processed by variable magnetic dip polarizing technology.The potential field conversion and separation of polarizing magnetic data are carried out by moving average filtering and vertical second derivative method,and the ver-tical second derivative anomalies,regional anomalies and local anomalies are obtained.Combining with the surface geological information of Afghanistan,the fault structure of the study area is identified and the loca-tion of the hidden acidic magmatic rocks is delineated.The results show that the magnetic properties of the Middle Sword and Metaglacial in Afghanistan are generally strong,while Quaternary,Neoproterozoic,and Cretaceous show generally low magnetic characteristics.The area is characterized by well-developed faults,with the Herat-Chakhchalan area as the boundary,the faults to the north of the boundary are in a nearly east-west direction,while those to the south of the boundary are in a north-east direction.The dis-tribution of magmatic rocks corresponds well with the high value of magnetic anomaly,and the characteris-tics are consistent with the regional structural characteristics.In the end,the results provides a geophysical basis for the exploration of oil and gas resources in central and western Afghanistan.
关键词
阿富汗地区/航磁异常/岩浆岩/断裂Key words
Afghanistan region/aeromagnetic anomalies/magmatic rocks/fractures引用本文复制引用
基金项目
国家自然科学基金面上项目(42172224)
陕西省自然科学基础研究计划(2021JM-401)
出版年
2024
国家科技期刊平台
NSTL
万方数据