【摘要】 低位三角洲砂体在油气成藏中具有储集条件好、近油源、临近断裂疏导体系和储盖配置好等多个有利条件,近年来渤海油田的勘探实践也证明了低位三角洲砂体是渤海隐蔽油气藏勘探的一个重要领域。从低位楔形三角洲砂体的形成条件分析入手,重点剖析了旅大4-2油田典型低位楔形三角洲砂体的剖面和平面特征,并通过楔形模型正演以及多个低位楔形三角洲砂体的实例分析,探讨了低位域楔形三角洲砂体岩性尖灭线的地震响应特征,提出了"调谐尖灭带"的概念,应用该技术有效地刻画了JX1-2北上倾尖灭型油气藏的岩性尖灭线。"调谐尖灭带"概念完善了少井条件下隐蔽圈闭地震描述技术,为描述类似低位楔形三角洲砂体岩性尖灭线提供了可靠的理论基础,具有很强的可操作性。更多还原

【Abstract】 Lowstand-tract delta sandst one have many favorable advantages in the oil and gas reservoir conditions:good reservoir,close to oil source,close to the fracture system and better reservoir cap configured etc.The Bohai oil field prac-tice in recent years has proved that lowstand-tract delta sandstone is an important area in Bohai subtle reservoir exploration.First of all,this paper discussed the formation conditions of lowstandtract wedge-shaped delta sandstone,then analyzed the profile and surface characteristics of a typical lowstand-tract wedge-shaped delta sandstone in LD4-2 oilfield.Through the forward wedge modeling and case study of several lowstand-tract wedgeshaped delta sandstones,the author discussed the seismic response characteristics of the pinch-out line on lowstand-tract wedge-shaped delta sandstone,and proposed a new concept "Tuning pinch strip".With the application of this technolo-gy,the author effectively portrayed the lithological pinch-line of JX1-2N Stratigraphic trap.At the same time,Tuning pinch strip " concept improved the seismic descrip-tion technologies of subtle traps under less well conditions and also provides a reliable theoretical basis to describe the pinch-line of similar lowstandtract wedge-shaped delta sandstone with strong operability.更多还原