莺歌海盆地与济阳拗陷成因机制与沉积特征的比较及其油气勘探意义

Comparative Study of the Formation Mechanism and Sedimentary Characteristic Between Yinggehai Basin and Jiyang Depression and Its Significance for Petroleum Exploration

莺歌海盆地近10年来一直处于勘探低谷期。以比较研究为手段,对莺歌海盆地与济阳拗陷形成演化机制进行了对比分析。研究表明,二者具有诸多相似性:均受控于大型先左旋后右旋的走滑断层,盆地构造演化经历了断陷、断拗转换、拗陷阶段;沉积-沉降中心均有迁移之规律,发育多个沉积旋回,沉积体系具有多样性;均具有异常地层压力,超压现象明显。因此,可借鉴济阳拗陷油气勘探成功经验,指导莺歌海盆地天然气成藏规律研究。

Over the past decade,Yinggehai basin has been in a trough period of exploration.Based on the comparative study method,the formation and evolution mechanisms between Yinggehai basin and Jiyang depression have been analysed.Studies have shown that the two have many similarities： Both of which are controlled by large-scale after the first L-dextral strike-slip fault.The tectonic evolution experienced rift,rift-depression transform period,depression.Developed multiple deposition cycles,deposition and subsidence centers migrated.Depositional systems are diversity.Both have abnormal formation pressure.Therefore,using Jiyang depression successful experience in hydrocarbon exploration for reference to guide Yinggehai basin gas accumulation study will open up a new prospect for gas exploration in Yinggehai basin.