论文部分内容阅读
在Vail经典层序地层学理论指导下,综合利用岩心、钻井、测井以及地震等资料,在白驹凹陷古近系共识别出6个层序界面,划分出1个Ⅰ级层序、2个Ⅱ级层序、5个Ⅲ级层序,并认为Ⅲ级层序SQ1—SQ4、SQ5分别与盆地坳陷—断陷阶段和强烈断陷阶段相对应。运用等时对比理论和技术方法,建立了白驹凹陷古近系层序地层格架,并详细地讨论了古近系Ⅲ级层序与生储盖组合的关系,认为低水位及晚期高水位体系域为有利储层的发育位置,湖侵体系域及早期高水位体系域则为烃源岩和盖层的发育位置,之间相互组合形成了3套生储盖组合,其中下生储盖组合为白驹凹陷古近系最好的一套生储盖组合。
Under the guidance of the Vail classic sequence stratigraphy theory, six sequence interfaces are identified in the Paleogene of Baiju Depression by comprehensively using such data as core, drilling, well logging and seismic. A second-order sequence and a fifth-order sequence. It is concluded that the third-order sequences SQ1-SQ4 and SQ5 correspond to the basin-depression-depocentiation and strong-faulted depression, respectively. By using isochronism theory and technical methods, the paper established the Paleogene sequence stratigraphic framework of Baiju Depression, and discussed in detail the relationship between the Ⅲ-grade sequence of the Paleogene and the reservoir-cap combination. It is considered that the relationship between low water level and late high water level The system tract is the developmental location of the favorable reservoirs. The lake invasion system tract and the early highstand system tract are the developmental positions of source rocks and cap rocks, which are combined to form three reservoir-cap assemblages, of which the subsurface reservoir cap The combination is the best set of reservoir-cap combination of Paleogene in Baiju sag.