断裂作用对北大港构造带潜山油气藏的控制

北大港构造带经历了多期构造活动,发育印支早中燕山期逆冲断裂体系和晚燕山喜山期伸展断裂体系,对该构造带下古生界古潜山油气藏的缝洞性储层发育、油气潜力以及封闭条件等方面具有明显的控制作用。研究表明,与冲断作用及其相关褶皱作用形成的裂缝促进岩溶作用的进行,导致缝洞性储集层的形成;古潜山油气藏的油气源、油气成熟度和油气充注与新生代伸展断层作用有关;潜山圈闭的封闭条件是由基底卷入正断层的侧向封闭、盖层正断层发育特点及其对盖层的破坏程度确定的。

CONTROL OF FAULTING OVER OIL-GAS POOLS OF BURIED HILLS IN BEIDAGANG STRUCTURAL BELT

Beidagang structural belt was experienced multi stang tectonic movements.It has both the thrust faulting system formed in Indosinian early and mid Yenshan epoch and extensional fault system formed in late Yenshan Himalayan epoch.The thrust fault and extensional fault had appearent control over the development of fracture cave reservoir,oil and gas potential,trap sealing conditions of Lower Paleozoic buried hill reservoir in this belt.The researches indicate that the fractures formed by thrusting and the related folding promoted the karstification and formation of the fracture cave resrevoir;source,maturity and afflux of buried hill reservoir were related to extensional faulting in Cenozoic;the sealing of buried hill traps were determined by both the lateral sealing of hasement involved normal fault and the contribution of mormal fault in the cover rock to top sealing.