东吴次凹沙三段的发育特征与油气前景

The Development Features and Oil and Gas Prospects of the Third Member of Shahejie Formation in Dongwu Subdepression

李书忠¹,蒲仁海²,李　伟³,吴亚红³

Li Shuzhong，Pu Renhai, Li Wei, et al

1. 中原石油勘探局地质录井处,2. 西北大学地质系,3. 中原油田分公司勘探事业部

Geologic logging Divison , Zhongyuan Petroleum Exploration Bureau, SINOPEC, Henan 457001 , P. R. China

东吴次凹由于处在具不同性质基底的渤海湾南华北裂谷盆地的交界处,因而NW—NWW 向断裂十分发育,它与NNE —NE 向断裂相互切割彼此牵制,不仅减少了沙三段这一区域上普遍具生油意义的地层段的沉积范围和厚度,而且抑制了深水湖相的持续发育,造成了该凹陷生油岩和蒸发岩不发育的特征。

Dongwu subdeprssion locates in the border of Bohaiwan and Southern North - China rift. As it is controlled by interaction of two rift basements with different properties , the NW-NWW faults developed intensively in this area. The inter-excise and inter-rest raints of the NW-NWW and NE-NNE faults deeply influenced the development of the Third Member of Shahejie Formation , which is a regional oil source - rock. Such a tectonic nature not only resulted in a less dist ribution and thinner thickness of the Third Member of Shahejie Formation , but also rest rained the prevailing of deep lacustrine deposition. In addition , it caused a exclusive characteristic of without carbonate and evaporate rocks in Dongwu sub - depression different f rom contiguous northern and southern depressions.