海上油田过路层段曲流河砂体解剖及应用

Dissection and application of meandering river sand body in passing layer of offshore oilfield

渤海海域P油田主力开发层位为新近系馆陶组储层,上部明化镇组下段曲流河储层作为过路层段长期未开发,钻遇井分布极不规则。目前主力层已进入中高含水率开发阶段,为开展未动用过路层段精细开发,以L30油组曲流河砂体为例,采取逐级解剖的思路,充分运用钻井测井资料,以沉积模式为指导,分别从单一河道、单河道内部及侧积体3个级次对曲流河砂体逐级进行精细解剖,并提出相应开发策略。结果表明L30油组可划分为9期单期河道,各期次平面可分南北两条单一河道,其中单一河道满岸宽度为33.2~349.0 m,单一河道带宽度为280~1400 m,点坝跨度为300~1400 m,单一侧积体厚度为1~5 m,侧积体水平宽度为22.13~232.66 m,侧积层倾角为2°~7°,侧积层间距为15~120 m。根据以上研究成果,结合研究区整体开发策略,提出了6口水平井井位部署建议。

The main producing reservoir of P oilfield in Bohai Sea area is in Neogene Guantao formation,the well network of meandering river reservoir in the lower Minghuazhen formation as passing layer is extremely irregular and has not been developed for a long time.At present,the main stratum has entered the stage of medium-high water cut development.So as to develop the passing layer,the research take the L30 oil formation meandering river sand bodys as an example,use drilling and logging datas to conduct sandbodys anatomy stepwisely guided by sedimentary model.The sand bodies can be divided into three levels,the single channel,single channel interior and lateral accretion body.L30 oil formation can be divided into 9 stages river channels,and each stage can be divided into two single river channels north and south on the plane.The full bank width of the single river channel is 33.2~349.0 m,the width of a single channel is 280~1400 m,the point bar span is 300~1400 m,the thickness of the single lateral accretion bodies is 1~5 m,the width is 22.13~232.66 m,the dip angle of the lateral interlayers is 2°~7°and the interval between the lateral interlayers is 15~120 m.Based on the above research results and combined with the overall development strategy of the study area,the suggestion of 6 horizontal wells is put forward.