天宫一号高光谱数据烃类微渗漏信息提取

Extraction of hydrocarbon micro-seepage information based on TG-1 hyperspectral data

烃类微渗漏遥感探测技术是一种油气直接调查方法,主要依据油气藏上方地表的低价铁富集、粘土矿物丰度高和碳酸盐岩含量高等异常现象。通过分析高光谱遥感油气蚀变信息提取理论,研究了各种烃类蚀变矿物在天宫一号(TG-1)高光谱数据上的光谱响应特征;依照突出所需矿物并压制其他地物特征的思想,选取不同解译标志的强吸收和高反射波段,采用比值法进行特征信息增强与提取;开展甘肃省庆阳地区TG-1高光谱数据的油气微渗漏信息提取研究。研究结果表明,研究区地表蚀变遥感异常信息的分布与已有地质分析结果有较好的一致性,与实际的油气区吻合较好,验证了本文方法的可行性,显示了TG-1高光谱数据的油气探测潜力。

The hydrocarbon microseepage detection method with remote sensing technology is a direct way for oil and gas investigation. According to several anomalous phenomena above oil and gas reservoirs,such as the enrichment of low-grade iron elements,the abundance of clay minerals and high carbonate content,this paper proposes an oil and gas alteration information extraction theory with hyperspectral method. Based on the theory,the authors analyzed the spectral response characteristics of various hydrocarbon alteration materials with hyperspectral data of the Tiangong-1（ TG-1）,highlighted targeted mineral feature information and at the same time suppressed the information of other ground objects,selected the high-absorption and high-reflection bands of the different interpretation signs,and then used the band ratio method to highlight and extract feature information. With the TG-1 hyperspectral data of Qingyang City,Gansu Province,the authors conducted oil and gas micro-seepage extraction and the results show that the distribution of the abnormal information of surface alteration is not only in good consistency with the local geological analysis results but also in good agreement with the actual oil and gas area data,thus verifying the feasibility of the method proposed in this paper and demonstrates the detection potential of TG-1 hyperspectral data.