摘要
应用高分辨率层序地层学分析法,对河146块沙三中基准面旋回进行划分。研究基准面旋回变化对浊积扇的控制作用。结果表明:基准面旋回对扇体发育具有强控制作用,控制着扇体的沉积相类型、单期扇体的形态、多期扇体叠加模式以及纵向叠置程度。浊积扇主要发育水道型浊积扇和无根型浊积扇两种沉积类型。基准面高时,发育无根浊积扇,扇体规模小,平面分布零星,纵向隔层发育,砂体叠置程度低;基准面低时,发育水道浊积扇,砂体规模大,平面上连片分布,纵向隔层厚度小,发育砂体集中段。扇体的叠加模式也可分为"扇上扇"型和"扇外扇"型2种。基准面上升半旋回,扇体向源退积,形成"扇上扇"模式;基准面下降半旋回,扇体向前推进,形成"扇外扇"模式。研究结果对该区及临区寻找有利区域有一定的预测和指导作用。
Based on the high resolution sequence stratigraphy analysis,He-146 base level cycles of the middle section of the 3rd member were divided and the control effect of the base level cycle for turbidite fan was studied.The results showed that the base level cycle has strong control on the development of fan,controlling the sedimentary type of turbidite fan,the morphology of single stage fan,the superposition mode of multi-stage fan and vertical stacking degree. Turbidity fan is mainly developed two kinds of sedimentary types,channel type turbidity fan and non-root type turbidity fan. When the base-level was high,non-root type turbidity fan was developed,with small distributing area,sporadic plane distribution,and low contraposed degree of sand. When the base-level was low,channel type turbidity fan was developed,which sand was distributed in large area continuously in the plane and developed with small interlayer thickness in the vertical. The superposition mode of fan body can also be divided into 2 types,'fan on the fan'and 'fan out the fan'. In the base level rise half cycle,fan was back to the provenance,forming 'fan on the fan'. In the base face down half cycle,fan pushed ahead,forming 'fan out the fan'.The results of the study have a certain guiding role to find the favorable area.
出处
《科学技术与工程》
北大核心
2016年第20期140-145,共6页
Science Technology and Engineering
基金
胜利油田分公司课题项目(YKY1303)资助
关键词
基准面旋回
浊积扇
沙三中
叠加模式
base level cycle
turbidite fan
the 3rd member of Shahejie formantion
superposition mode
