摘要
除了构造信息之外,在地震剖面中,还蕴藏着大量地层和沉积特征方面的信息.充分利用这些信息,解释它们所代表的地层学和沉积学意义,有助于在井数很少的情况下正确地划分地层,识别沉积环境,建立沉积体系,推测有利的含油气地带.此外,地震地层学方法把地层和构造两方面的特征天然地结合起来,对于解释盆地的形成和发育机制,有着重大意义.作者利用地震地层学方法,对黄骅拗陷下第三系沉积环境中的几个基本问题重新加以认识.其主要结果是;1.明确了各层组间的接触关系,调整了某些层组的界线;2.半定量地计算了始新世——渐新世海平面升降变化;3.通过古水流方向分析,明确了板桥及唐家河地区东营组、沙一段及沙二段三角洲的物源;4.山麓型冲积扇三角洲是本区主要的骨架沉积相,而重力滑动所引起的滚卷背斜和刺穿构造则是本区重要构造特征.
Abstract
In addition to the structural style, there are a lot of information about stratigraphy and sedimentology which hold in stock in the seismic sections. By making full use of them we can interprete what do they imply in the sense of stratigraphy and sedimentology. To this point it will be contributive as to make the depositional sequence subdivision properly, to recognize the sedimentary enviroument; to establish the depositional system; and to predict the potential oil trend in basins where well control is limited. Moreover the seismic stratigraphy method combine the characteristics of both stratigraphy and tectonic together simultaneously, it will be of great immediate significance for expounding the formation of basin as well as the development of mechanism.By taking advantage of the seismic stratigraphy method, the authors tried to make a reconsideration to basic concepts of the sedimentary enviroument of Eogene sediments in the Huanghua depression. Its results essentially are:1 ) Defining the contact relationship among each number and readjusting several boundary lines of them.2 ) Measuring the relative rise and fall of the sea level from Eocene to Oligocene semi-quantitatively.3) Defining the provenance of the fan-delta of Dongying member in Banqiao and Jangjiahe area and the delta of Shahejie member 1-2 by way of analysing the direction of palaeocurrents.4 ) The alluvial fan-delta (structural delta of Caskill type) is the main framework facies of the sediment in this area whereas the roll-over anticline caused by gravitational slumping and shale diapir structure are the prominent tectonic feature in this area.
论文详情