新疆伊犁盆地巩留凹陷航空高光谱油气探测

为了进一步了解伊犁盆地巩留凹陷油气勘探潜力,为该地区下一步油气勘查提供依据和新的技术支持,利用航空高光谱SASI数据,采用混合调制匹配滤波(MTMF)方法,在伊犁盆地阿吾拉勒西段山前提取了油气烃信息,主要分布在二叠系晓山萨依组,反映了油页岩层的分布和油气渗漏地段,地表油气渗漏主要受断裂控制,与油气渗漏有关的蚀变主要为粘土化,碳酸盐化次之。在巩留凹陷提取了粘土化和碳酸盐化信息,主要分布在拜石墩与阿克吐别克乡之间,通过干扰因素的排除,在拜石墩南部筛选了四片油气微渗漏区。最后,结合区域地质、物探资料综合分析,认为该地区油气成藏和排烃可能始于燕山早期,在喜山期遭到严重破坏,盆地的不对称压陷,加速了油气的垂直和侧向运移,在盆地内部形成微渗漏,在阿吾拉勒山前沿着断裂逸散至地表形成宏渗漏,巩留凹陷拜石墩南部微渗漏地区对应深部二叠系褶皱带是下一步油气勘查有利目标区。

Oil- gas exploration using airborne hyperspectral remote sensing in the Gongliu Sag, Ili Basin, Xinjiang

To understand the potential of oil- gas exploration in the Gongliu sag, Ili basin, airborne hyperspectral SASI data was used to extract oil- gas hydrocarbon and related alteration information in the front of the western Awulale Mountain by MTMF method. The results show that hydrocarbon occurs mainly in the Permian Xiaoshansayi Formation, which reflects the distribution of oil shale strata and oil- gas seepage sites. Alteration related to oil- gas seepage is mainly clayization, followed by carbonatization. Clayization and carbonatation were found in the Gongliu sag, and are distributed mainly in the area between Baishidun village and Aktubek township. Four potential areas of oil- gas microseepage have been selected in the south of Baishidun village. Combined with regional geological and geophysical data, the study concludes that petroleum entrapment and hydrocarbon expulsion may start in the early Yanshannian and destroyed seriously in the Himalayan. Asymmetric compressive stress in the basin accelerated the vertical and lateral migration of oil gas, forming microseepage inside the basin. Some oil- gas migrated along faults to surface in front of Awulale Mountain, forming macroseepage ultimately. Based on comprehensive analysis, folded strata of the Permian underneath the microseepage areas in the south of Baishidun village will be target for future oil- gas exploration.