摘要
运用高分辨率层序地层学原理,详细分析了鄂尔多斯盆地富县地区二叠系山西组地层沉积的基准面旋回特征,共识别出了2个长期旋回、4个中期旋回和8～12个短期旋回,并得出了两类可容空间的短期旋回识别特征.对不同井基准面旋回联井分析得出,储集层段多发育于短期基准面上升半旋回的水下分流河道、河口坝和浊流沉积砂体中,且砂体与前三角洲泥呈指状交叉,形成岩性油气藏.建立的研究区高分辨率层序地层格架对进一步的油气勘探具有指导性的意义.
The Permian Shanxi formation in the Fu county is analyzed by the theory of high-resolution sequence stratigraphy in ordos basin and is totally subdividde dinto 2 long-term base level cycles and 4 middle-term cycles and 8~12 short-term cycles.Based on the above,two types of the accommodation's recognized properties of ht short-term base level cycle are summarized.Through the different well's base-level cycles comparing, it indicated that the reservoir developed in the subdistributay channel,the debouchure bar and the turbidities in the half ascending short-term cycle,and crossed with the prodelta mud,then easily formed lithologic oil pool.The high-resolution sequence stratigraphy correlation frame work is established significantly to the further exploration.
关键词
鄂尔多斯盆地
基准面旋回
层序地层格架
岩性油气藏
short-term base level cycle,isochronoustratigraphic frame work
lithologic oil pool
Permian Shanxi formation
Ordos basin
