The period of migration and accumulation of oil and gas is Triassicsystem and from Jurassic system to Cretaceous system.
两个成藏期分别是三叠纪末和侏罗纪末—白垩纪；
2
The problem of borehole instability in the Triassicsystem and the Carboniferous system has been kept as a major difficulty in the exploration and development of this oilfield.
塔河油田三叠系、石炭系井眼失稳问题一直是该油田勘探与开发的技术难点。
3
The dark mudstone in Triassicsystem of Tanzhuang Formation which rich for organic substance is mainly source rocks, which has large thickness, wide distribution and great burial depth.