桩106块馆上段曲流河单砂体构型研究

Study on the Architecture of Single Sand body of Meandering River in the Upper Member of Guantao Formation,Zhuang106 Block

桩106块位于老河口油田的埕东凸起北部缓坡带上,整体地势较为平缓。前人研究成果表明,老河口油田馆陶组上段为陆相沉积,主要发育辫状河及曲流河等河流相沉积。根据研究区岩性、沉积构造、粒度及测井相等相标志资料,判断出研究区目的层段主要发育曲流河相;在前人地层精细划分和对比的基础上,以现代曲流河沉积模式为指导,以砂岩厚度等值线图为依托,测井相控制,地震资料约束,结合末期河道地震响应,完成曲流河砂体的精细刻画,在现有认识基础上,与动态资料充分结合,不断修正上述认识,最终构建曲流河砂体平面展布形态及剖面配置关系,识别曲流河单体主要构型要素为河道和末期河道,建立曲流河的末期河道组合模式。曲流河河道呈＂串珠状＂分布,为被末期河道分割的相互独立的砂体单元,末期河道的存在既细化了储层认识,又解决了油水矛盾。

Zhuang106 block locates in the northern gentle slope zone of Chengdong uplift in Laohekou Oilfield,and its overall terrain is relatively smooth.The previous research results show that continental facies was deposited in the upper member of Guantao Formation in Laohekou Oilfield,and braided river and meandering river were mainly developed.Based on the data of facies marks on lithology,sedimentary structure,grain size and logging facies in the study area,meandering river facies was developed mainly in the target formation of this area.On the basis of the fine strata division and correlation before,the fine depiction of meandering river sand body was completed guided by the modern sedimentary model of the meandering river and relied on the contour map of sandstone thickness.It was also combined with the seismic response of the late channel under the logging facies control and seismic data constraints.Based on existing knowledge and fully combining with dynamic data,the knowledge above is constantly revised.Finally,the horizontal distribution and profile configuration of the meandering river sand body were constructed,and the main structural elements of the meandering river were identified as the river channel and the terminal channel,and the terminal channel combination model of the meandering river was established.The meandering river channel was distributed in a se-ries of beads,which is an independent sand body unit separated by the terminal channel.The existence of terminal channel not only refines the reservoir recognition,but also resolves the oil-water contradiction.