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渤海湾盆地黄河口地区中新世坳陷湖盆萎缩期层序地层学分析Analysis of Sequence Stratigraphy during Lacustrine Basin Withering Period in the Neocene of Huanghekou Area, Bohai Bay Basin
滕玉波, 刘豪, 周心怀, 赵春晨
渤海湾盆地黄河口地区, 中新世, 坳陷湖盆萎缩期, 层序地层学Huanghekou Area, Baohai Bay Basin; Miocene; Withering Period of a Depressional Lacustrine Basin; Sequence Stratigraphy
《Advances in Geosciences》, Vol.3 No.6, 2013-12-25
黄河口地区新近纪坳陷湖盆萎缩期具有构造稳定、沉降缓慢；盆大水浅、地形平缓；物源稳定、分割性弱；断裂发育、破碎性强等特征。导致钻测井、地震不整合特征不明显，因此运用传统的井震结合开展层序识别和划分难度较大。论文提出了以旋回分析为主、界面识别为辅、地震–钻井结合为统一，结合层序发育的规模、层序内部构成的异同来印证层序划分合理性的多技术、多方法联合的层序地层学研究。最后通过对关键界面(层序及体系域界面)井震结合的平面“网络”闭合解释和误差来评价层序划分的质量。据此将黄河口地区中新统划分了4个三级层序、8个体系域。各三级层序具有明显的继承性和差异性。“洼陷”和“沟谷”有利于富集砂体，且展布方向与区内新近纪断裂斜交，预示了各沉积时期发育的浅水三角洲砂体与断裂体系有很好的匹配关系，具有良好的油气勘探远景。The Neocene in Huanghekou Area was a withering period and the depressional lacustrine basin was characterized by tectonically stable and slow subsidence; a large-area with shallow water and gentle topography; stable provenance and weak separation and well development of rift and strong fragmentation. Thus it is difficult to identify and subdivide sequences using the traditional well-seismic data combination method. The establishment and subdivision of sequence stratigraphy of the withering period of a continental lacustrine basin was proposed by using the multi-method and technology. Specifically the method is according to the cycle analyses, consulting the identification of unconformity of seismic and drilling well and logging data, considering the drilling well-seismic combination, through the plane network closure of the interpretation results of sequence surface from seismic, drilling well and logging data, and the check of rationality of sequence subdivision to conduct a comprehensive subdivision and establishment of sequence stratigraphy. In the Miocene of the Huanghekou Area, 4 third-order sequences and 8 systems tracts were subdivided. The sequences are obviously developed with inheritance and difference. The “sub-sag” and “valley”, biasing with the Miocene fault, are conducive to the enrichment of sandbodies, which indicates that the macro-distribution of sandbodies in different periods matches well with the faults and that the exploration of shallow systems has a giant potential and prospect.