浅水三角洲前缘指状砂坝构型特征——以渤海湾盆地渤海BZ25油田新近系明化镇组下段为例
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摘要
综合应用岩心、测井和地震资料,对渤海BZ25油田新近系明化镇组下段砂体进行了构型解剖,探讨浅水三角洲前缘指状砂坝内部的沉积微相组成,分析指状砂坝的宏观分布及内部构型特征。浅水三角洲前缘指状分支砂体为指状砂坝沉积,由河口坝、坝上分流河道以及天然堤组成,分流河道下切河口坝,薄层天然堤则披覆于分流河道两侧的河口坝之上。指状砂坝平面上多呈弯曲状,向盆地方向弯曲度有所增加,内部分流河道由深切河口坝型到浅切河口坝顶部型转变。研究区指状砂坝宽厚比为25～110,宽度与厚度呈一定双对数线性正相关关系,并受控于基准面旋回变化。针对指状砂坝,在注水开发方式下,应避免同一分流河道内注采的开发方式,并指出指状砂坝内分流河道的中上部及注采井未钻遇的河口坝砂体为剩余油挖潜的重点。
Core, well logging and seismic data were used to investigate sandbody architectural characteristics within Lower Member of Minghuazhen Formation in Neogene, Bohai BZ25 Oilfield, and to analyze the sedimentary microfacies, distribution and internal architecture characteristics of the bar finger within shoal water delta front. The branched sand body within shoal water delta front is the bar finger, consisting of the mouth bar, distributary channel over bar, and levee. The distributary channel cuts through the mouth bar, and the thin levee covers the mouth bar which is located at both sides of distributary channel. The bar finger is commonly sinuous and its sinuosity increases basinward. The distributary channel changes from deeply incising the mouth bar to shallowly incising top of the mouth bar. The aspect ratio ranges from 25 to 50 and there is a double logarithmic linear positive relationship between the width and thickness for the bar finger, which is controlled by base-level changing in study area. For the bar finger, injection and production in the same distributary channel should be avoided during water flooding development. In addition, middle-upper distributary channel and undrilled mouth bar are focus of tapping remaining oil.
Core, well logging and seismic data were used to investigate sandbody architectural characteristics within Lower Member of Minghuazhen Formation in Neogene, Bohai BZ25 Oilfield, and to analyze the sedimentary microfacies, distribution and internal architecture characteristics of the bar finger within shoal water delta front. The branched sand body within shoal water delta front is the bar finger, consisting of the mouth bar, distributary channel over bar, and levee. The distributary channel cuts through the mouth bar, and the thin levee covers the mouth bar which is located at both sides of distributary channel. The bar finger is commonly sinuous and its sinuosity increases basinward. The distributary channel changes from deeply incising the mouth bar to shallowly incising top of the mouth bar. The aspect ratio ranges from 25 to 50 and there is a double logarithmic linear positive relationship between the width and thickness for the bar finger, which is controlled by base-level changing in study area. For the bar finger, injection and production in the same distributary channel should be avoided during water flooding development. In addition, middle-upper distributary channel and undrilled mouth bar are focus of tapping remaining oil.
引文
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[17]朱筱敏,赵东娜,曾洪流,等.松辽盆地齐家地区青山口组浅水三角洲沉积特征及其地震沉积学响应[J].沉积学报,2013,31(5):889-897.ZHU Xiaomin,ZHAO Dongna,ZENG Hongliu,et al.Sedimentary characteristics and seismic sedimentologic responses of shallowwater delta of Qingshankou Formation in Qijia Area,Songliao Basin[J].Acta Sedimentologica Sinica,2013,31(5):889-897.
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[19]曾洪流,赵贤正,朱筱敏,等.隐性前积浅水曲流河三角洲地震沉积学特征:以渤海湾盆地冀中坳陷饶阳凹陷肃宁地区为例[J].石油勘探与开发,2015,42(5):566-576.ZENG Hongliu,ZHAO Xianzheng,ZHU Xiaomin,et al.Seismic sedimentology characteristics of sub-clinoformal shallow-water meandering river delta:A case from the Suning area of Raoyang sag in Jizhong depression,Bohai Bay Basin,NE China[J].Petroleum Exploration and Development,2015,42(5):566-576.
[20]冯文杰,吴胜和,张可,等.曲流河浅水三角洲沉积过程与沉积模式探讨:沉积过程数值模拟与现代沉积分析的启示[J].地质学报,2017,91(9):2047-2064.FENG Wenjie,WU Shenghe,ZHANG Ke,et al.Depositional process and sedimentary model of meandering-river shallow delta:Insights from numerical simulation and modern deposition[J].Acta Geologica Sinica,2017,91(9):2047-2064.
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