基于遥感技术的龙门山前山带烃类微渗漏信息提取

通过对龙门山前山带含油区与非含油区的岩石、土壤、植被等进行测试,认为烃类微渗漏会造成地表热异常、红层褪色、低价铁富集以及粘土矿化等现象,并对研究区的粘土矿物、Fe3+、Fe2+与烃类的波普曲线特征进行了分析对比。以ETM卫星图像为主要信息源,选择了TM2/TM3、TM3/TM4和TM5/TM7进行比值处理,从光谱数据中直接提取出碳酸盐化、粘土矿化、红层褪色等油气蚀变信息,并在对研究区遥感地质解译的基础上,指出烃渗漏信息异常晕主要沿断裂带分布,特别在不同走向断裂的交汇区域分布面积和强度较大,而在已知油气圈闭区域,信息晕主要呈碎片状或斑点状零散分布,且以低值异常为主。根据烃渗漏异常的分布特征,提取出石板滩、中坝、孝泉、聚源、鸭子河以及邛崃等遥感信息异常区块。

Hydrocarbon Microseepage Information Extracting through Remote Sensing Technology in Front Range of Longmenshan

Through rock,soil,vegetation tests in oil-bearing and non-oil-bearing areas in the front range of Longmenshan,considered that the hydrocarbon microseepage can cause phenomena of ground surface thermal anomalies,red beds decoloration,low valent iron enrichment and clay mineralization,carried out contrastive analysis of spectral curve features of clay minerals,Fe3 ＋,Fe2 ＋ and hydrocarbons in study area.To take the ETM satellite images as main information source,TM2/TM3,TM3/TM4 and TM5/TM7 have selected to carry out ratio processing,and picked up oil and gas alteration information of carbonatization,clay mineralization,red beds decoloration etc.directly.Based on study area remote sensing geological interpretation,pointed out that the hydrocarbon seepage information anomalous halos are mainly distributed along faulted zones,especially in intersecting regions of different striked faults have larger distributing area and intensity,while in known oil and gas traps,information anomalous halos mainly present fragmentary or spotted distribution and mostly low anomalies.According to distribution features of hydrocarbon seepage anomalies have picked up Shibantan,Zhongba,Xiaoquan,Juyuan,Yazihe and Qionglai remote sensing information anomalous blocks.