松辽盆地长春岭背斜带成藏过程

松辽盆地东南隆起区长春岭背斜带发现了大规模的油气田。对于该背斜带的成藏过程，前人认为来自深层的天然气首先占据了构造高部位的储集层，来自上部烃源岩的原油只能聚集于构造低部位。通过对油气藏的成藏过程研究，认为来自上部青一段烃源岩的油气以超压为运移动力，以断层为运移通道，首先占据了构造，在盆地演化进入挤压萎缩阶段时，长春岭背斜带的构造已形成，深层天然气沿着同生断裂向上运移进入构造，原油被驱动到构造低部位，原油具有明显的气洗现象。由于深层气源充足，且油气藏曾经多次遭受破坏，古气藏逐渐被深层气置换，所以混合气中原油伴生气的比例很少。正是由于这样聚集过程，形成了构造的高部位是气藏、低部位形成油环的油气分布规律。图5表2参15

Reservoir formation process in the Changchunling anticline of Songliao Basin

A group of oil and gas pools have been found in the Changchunling anticline,southeastern Songliao Basin.Predecessors thought that gas from deep formation occupied upper zone of the structure,and oil from upper source rock only filled the down-zone of the structure.Through researching the reservoir formation,the paper indicates that oil and gas from the K_(1)qn_(1) section source rock migrated downward with abnomal pressure and passed through fault to the structure.When the basin evolution was in the extruding-shrivel period,the Changchunling anticline had taken shape.Gas in deep formation passed through fault,migrated upward and accumulated in the structure.Then oil was expelled to the down-zone of the structure,the oil displayed a "gas-washing" character.Because the gas in deep formation was abundant and several destruction of the reservoir caused original gas reservoir to be substituted by the gas in deep formation,the mixed gas was with little associated gas.It is such a process that leads to gas reservoir locating at the upper of the structure and oil ring appearing in the down of the structure.