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北部湾盆地涠西南凹陷WH油田沉积相研究及甜点预测

Sedimentary Facies Research and Sweet Spot Prediction of WH Oilfield in the Weixinan Depression of the Beibu Gulf Basin
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摘要 WH油田主要含油层段为流沙港组流一段,储层厚度和岩性变化快,砂体分布及连通性复杂。为厘清流一段储层分布和甜点区域,提高油田开发效益。通过测井、岩心分析和地震资料分析认为,流一段储层为缓坡陡倾型扇三角洲前缘亚相沉积,识别出水下分流河道、河口坝、席状砂、前缘滑塌、水下碎屑流、分流间湾6种沉积微相。通过物源分析、单井与连井微相、砂体追踪和储层反演预测,厘清了井间砂体连通性,精细刻画了储层展布特征,并建立了油田沉积模式和沉积演化规律。纵向上,流一段早期为扇三角洲平原和三角洲前缘亚相,逐渐演化为滨浅湖亚相;晚期演化为席状砂为主的扇三角洲前缘—前扇三角洲亚相。平面上,在5井区发育扇三角洲平原亚相沉积;3井区与6井区发育前缘水下分流河道沉积;2井区为前缘远砂坝—席状砂和前三角洲泥沉积;提出无井控的中部砂体为甜点区域。 The main oil-bearing section of WH oilfield is a section of the Quicksand Port Formation,which changes rapidly in reservoir thickness and lithology,and complex sand distribution and connectivity.In order to clarify the reservoir distribution and dessert area of a section of the stream,improve the efficiency of oilfield development.Using logging,core analysis and seismic data analysis,it is believed that the reservoir of the flow section is a subfacies sedimentary of the leading edge of the slow-slope steep-inclined fan delta,and six kinds of sedimentary microfacies are identified:underwater diversion channels,estuarine dams,mat-shaped sand,leading edge landslides,underwater clastic flows,and inter-bays.Through source analysis,microfacies of single wells and connected wells,sand body tracking and reservoir inversion prediction,the connectivity of sand bodies between wells is clarified,the characteristics of reservoir spread are finely delineated,and the sedimentary patterns and sedimentary evolution laws of oilfield are established.Vertically,a section of the stream gradually evolved into a shallow lake subfacies in the early fan delta plains and leading edges.Late evolution of the fan delta leading edge-anterior fan delta subphase dominated by mat-shaped sand.Planarly,fan delta plain subfacies are developed in the 5 well area.Underwater shunt channel sedimentation at the leading edge of development in 3 well area and 6 well area.The 2 well area is the anterior edge far sand dam-mat-shaped sand and the anterior delta mud sedimentation.The middle sand body without well control is proposed as the dessert area.
作者 曾晓华 陈建 孟迪 骆逸婷 陈之贺 彭文丰 ZENG Xiao-hua;CHEN Jian;MENG Di;LUO Yi-ting;CEHN Zhi-he;PENG Wen-feng(Hainan Branch of CNOOC(China),Haikou 570312,China)
出处 《河北地质大学学报》 2024年第1期43-50,共8页 Journal of Hebei Geo University
基金 中海油(中国)有限公司科技项目(CNOOC-KJ135ZDXM38ZJ01ZJ)。
关键词 北部湾盆地 涠西南凹陷 流沙港组 沉积相 储层预测 有利目标 Beibu Gulf Basin Weixinan depression Liushagang Formation the sedimentary facies reservoir prediction favorable target
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