济阳拗陷堡坝砂体的识别及其地球物理特征

堡坝发育区由于湖浪和岸流水介质能量较高，碎屑沉积物长期经受冲刷，所以堡坝砂体油气储集物性极好，是油气藏勘探的重要目标之一，但其识别较难。测井曲线的韵律特征为识别砂体的不同发育部位提供了直接依据，其韵律特征的组合又进一步反映了湖岸的变迁及砂体的发生、发展和消亡的全过程。本文对比现代堡坝砂体的结构特征，利用测井曲线的堡坝砂体特征，首次提出了济阳拗陷广利一八面河地区的砂体为古堡坝砂体，并首次将时频分析技术和沉积相分析技术运用于对古堡坝砂体的识别，不仅验证了该区堡坝砂体的存在，而且还发现了车西凹陷的堡坝砂体。广利八面河油田为亿吨级大油田，属古堡坝砂岩储层油气藏，这对于扩大济阳拗陷油气勘探的类型具有积极意义。

Identification of barrier bar sand body in Jiyang Depression and its geophysical feature.

Because of higher energy of lake wave and ru- nning water medium in barrier-bar-developed zone and eroded clastic sediments for a long period,the barrier bar sand body has excellent oil/gas accumulation characters,which is one of important targets of reservoir exploration but difficult to be identified.The rhythm feature of logging curves provided direct basis for identification of sand body in different developed parts,the composition of rhythm feature also further reflected the changes of lakeshore and whole process that the sand body generated,developed and died out.After correlation of the structural feature of current barrier bar sand body and using the characters of logging curves of barrier bar sand body,the paper first presented that the sand body in Guangli-Bamianhe region is palaeo-barrier bar sand body and firstly using time-frequency analysis technique and sedimentary facies analysis technique for identification of palaeo-barrier bar sand body,that not only verified the existence of barrier bar sand body in the region,but also found barrier bar sand body in Chexi depression.The Guangli-Bamianhe oilfield belongs a hundred million ton oilfield and the reservoir having palaeo-barrier bar sand body type,which has active meaning for expanding types of oil/gas exploration in Jiyang Depression.