论文部分内容阅读
为快速圈定含油气有利区段,利用1∶200000水系沉积物测量成果资料,对松辽盆地的林西-巴林左地区进行了元素地球化学分区,并对各分区的地质地球化学特征进行了分析。结果表明,研究区可分为6个地球化学区,不同分区内微量元素具有不同的元素组合特征。其中,亲铁元素(Co、V、Ni、Cr、Fe2O3、Mn、Ti)异常的分布与晚古生代地层分布基本吻合;造岩元素(CaO、MgO、Ba、Sr)异常的分布与中新生代地层基本吻合;高温元素(W、Mo、Sn、Bi)异常的展布与区内中酸性岩浆岩的分布吻合;亲铁元素(Co、V、Ni、Cr、Fe2O3、Mn、Ti)、亲硫元素(Cu、Zn、As、Sb)等在第Ⅴ地球化学区的周围形成明显的椭圆形高背景环带,在该环带所围限的区域内部构成低背景区;Ba、La、Sr等在第Ⅴ地球化学区上方形成高背景场,表明第Ⅴ地球化学区是寻找油气的有利区域。
In order to quickly delineate the favorable hydrocarbon-bearing zones, the elemental geochemical zoning of the Linxi-Bahrain left area of the Songliao Basin was carried out using the data of 1: 200000 sediments of the water system and the geochemical characteristics of each area were analyzed . The results show that the study area can be divided into six geochemical zones, and the trace elements in different zones have different characteristics of elemental composition. Among them, the anomalous distributions of Fe, Fe, Ni, Cr, Fe2O3, Mn and Ti are basically consistent with Late Paleozoic stratigraphic distribution; the distribution of anomalous rock-forming elements (CaO, MgO, Ba, Sr) The distribution of anomalous high-temperature elements (W, Mo, Sn, Bi) agrees well with the distribution of moderate-acid magmatic rocks in the area. The distribution of anomalous Fe (Fe, Ni, Fe, Fe, Fe, Mn, Ti) Sulfur elements (Cu, Zn, As, Sb) etc. formed obvious oval-shaped high background zone around the Ⅴ geochemical zone and formed low background area in the zone surrounded by this zone. Ba, La, Sr Etc. formed a high background field above the Ⅴ geochemical zone, indicating that the Ⅴ geochemical zone is a favorable area for finding oil and gas.