东北地区油气领域接替形势展望 （代序）

东北地区存在5套油气勘探层系.松辽盆地内的白垩系松花江群坳陷层系是目前生产的主力,已进入稳产阶段后期.下白垩统的断陷层系仅在松辽、二连、海拉尔等盆地发现油气田,正处于勘探开发高潮期.以断陷为主体的下—中侏罗统含煤层系是待探索的新领域,可能在白垩系(甚至上侏罗统火山岩)覆盖下保存.近年来,东北地区上古生界的含油气远景已被广泛认可,并开展了选区评价工作.东北东部的新生界断陷含有丰富的煤、油页岩,其下可能有白垩系深埋,但受浅部火山岩的影响,对其深部的研究工作不足.针对以上5个领域的特点提出了今后的研究方向,特别强调了新领域开拓以及常规和非常规油气勘探并举.

The prospect of the development of oil and gas exploration in Northeast China (in lieu of preface)

There are five series of oil-and-gas exploration layers that occur in Northeast China, of which the Upper Cretaceous Songhuajiang Group distributed extensively in the Songliao basin has been treated as the predominant layer, which however has gradually lost its capability of oil-and-gas production at the late stage of stable production as compared with the Lower Cretaceous layers in Songliao, Erlian, Hailar and other basins which are at the culminating stage of exploration. Researches show that there most probably exist desirable layers of Middle-Lower Jurassic that have been preserved well underneath the Cretaceous basins (even under the Upper-Jurassic volcanic rocks). Recently, the Upper Paleozoic oil-and-gas bearing layers have been generally regarded as a remarkable potential prospective area on the basis of extensive work. Meanwhile, the coal and oil shale deposits of the Cenozoic period distributed widely in the fault depression basins might serve as good indicators to trace their underlying Cretaceous oil-and-gas bearing layers in the eastern region of Northeast China. According to the characteristics of the above-mentioned five Cretaceous layers with different ages, this paper suggests that the conventional and unconventional oil-and-gas exploration should be focused mostly on the newly-discvoered oil-and-gas bearing layers and areas.