摘要
在无井的情况下,利用围区古环境、三维地震等资料,应用数值沉积模拟软件,对渤海海域辽中凹陷东二下亚段湖底扇的形成过程及时空展布进行了研究。研究区东二下亚段可以划分为一个三级层序和三个体系域,湖平面曲线呈现脉冲式波动变化,主物源在盆地东侧和北侧两个方向。通过各个体系域的构造图,利用软件恢复古地貌、古构造,得到了相对真实的沉积背景,利用这些地质参数进行数值沉积模拟,进一步得到了湖底扇分布的三维形态和演化规律。结果显示,研究区湖底扇主要发育在在湖泛体系域内,受先期不稳定三角洲、湖泛域较强的水动力条件、沉积坡折带的耦合而形成,具有多期、双物源、分布范围广的特点。
In the case of no well,by using ancient environment and3 D seismic data in surrounding areas,with numerical simulation software on sedimentation,a fine study on the formation process of the sublacustrine fan and space distribution of Dong-II member of Liaozhong sag in Bohai sea waters has been carried out.Lower Dong-II member in the research area can be divided into a third-order sequence and 3 systems tracts;the lacustrine level curve presents pulse wave changes and the main source is from two directions in the east side and north side.Through structure diagrams of various system tracts,with the software to restore the ancient landscape and the ancient structure,the relative real sedimentary background has been obtained.By using these geological parameters,the numerical simulation study of sublacutrine fan sedimentation has been carried out,and the 3D models of the sublacustrine fan distribution and evolution regularity have been further obtained.The results indicate the sublacustrine fan is mainly developed in lacustrine fan system domain,which is affected by the coupling of early instability delta,strong hydrodynamic conditions and sedimentary slope break belt,and has the characteristics of multiple periods,double provenances and wide distribution rage.Numerical deposit simulation results provide useful guidance for fine reservoir description of the sublacustrine fan.
出处
《石油地质与工程》
CAS
2015年第4期15-18,153,共6页
Petroleum Geology and Engineering
基金
国家十二五重大专项"大型油气田及煤层气开发"(2011ZX05023-002)
关键词
辽中凹陷
湖底扇
数值沉积模拟
湖泛体系域
储层描述
sublacustrine fan
lake level change
numerical deposit simulation
lake flooding system domain
reservoir description
