港东开发区曲流河道砂体内部构型研究

Structural types within meandering channel sand bodies in Gangdong development zone

以大港油田港东开发区港东二区四断块为例,针对储集层横向变化较大、砂体内部剩余油潜力不明的难题,综合运用测井、地震、沉积模式及动态信息,从单一河道入手,对二区四断块主力油藏进行单砂体刻画及内部构型研究,通过单井相分析,对点坝内水平井进行侧积泥岩夹层识别,分析侧积体的规模,勾画末期河道边界,重建地下地质模型,总结出末期(废弃)河道和侧积泥岩是影响该类油藏油气富集的主控因素并进行点坝内部构型分析,有助于开发井网部署的设计,提高产能建设。

Taking the fourth fault block of the second area inGangdong development zone as an example,according to the problems of large lateral variations of the reservoirs and the unknown residual oil potential within sand bodies,integrated the use of wireline logging,seismic,depositional model and dynamic information,setting from the single channel,the single sand body description and internal structure study were made for the dominant reservoirs in the fourth fault block of the second area.By single well phase analysis,the authors identified the side-accumulated mudstone interbeds of the horizontal wells within the dot dam,analyzed the scale of side-accumulated bodies,outlined the last channel boundary,reconstructed the underground geological model,summarized that the last(abandoned)channel and side-accumulated mudstone are the main controlling factors which have the impacts on oil and gas accumulation in such reservoirs and analyzed the structural types within dot dam that help design the development well grid pattern and increase the productivity construction.