论柴达木盆地冷湖—南八仙构造带的含油气远景

柴达木盆地是我国西部地区的一个大沉积盆地，但已经找到的油气储量与其盆地面积和油气资源量极不相称，尽快摸清大规模油气田形成的石油地质规律是油气获得突破的基础。近年在柴达木盆地北缘的勘探中，陆续在冷湖—南八仙构造带发现了多个含油气构造，同时在科学探索井——冷科1井钻遇了千余米厚的侏罗系优质生油岩系，表明有形成大油气田的条件。通过对侏罗系烃源岩地球化学指标的分析和储层、盖层发育特征以及生储盖组合、油藏类型特点的分析，结合近期勘探成果，得出冷湖—南八仙构造带可能存在大规模油气聚集的结论，并依据石油地质条件和构造圈闭的特征，提出了近期勘探方向和勘探目标。

PETROLIFEROUS PROSPECT OF LENGHU-NANBAXIAN STRUCTURE BELT IN TSAIDAM BASIN

Tsaidam Basin is quite a large sedimentary basin in Western China.However, the oil and gas reserves discovered there are far from satisfactory in consideration of the basin area and the amount of its oil and gas resources. The prerquisite for making breakthroughs in exploration is finding out the geological laws governing the formation of large-scale oil/gas fields.Several oil/gas-bearing structures have been located in Lenghu-Nanbaxian structure belt during prospecting in northern part of Tsaidam Basin in recent years. Meanwhile well LK-1, one of our scientific exploration wells, penetrated Jurassic source rock as thick as some thousand meters.All these indicate that favorable conditions exist for the formation of large-scale oil/gas fields.In the present paper the authors analyzed SRI of Jurassic source rock, the characteristics of reservoir rock and caprock, the association of reservoir, caprock and the features of oil pools.In combination with the recent exploration achievements, it has been concluded that a large amount of oil/gas accumulation probably exist in Lenghu — Nanbaxian structure belt.In addition, based on the geological conditions and the characteristics of the structural traps, the targets for the near-future exploration activities are proposed by the authors.