Sequence Characteristics and Hydrocarbon Accumulation Model of Nantun Formation in Beixi Slope of Beier Sags
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摘要: 运用层序地层学指导油气藏勘探，是目前油气勘探的热门课题和重要的发展方向之一。以层序地层学理论为指导，综合运用地震、测井、岩心等资料，采用井—震对比综合分析，波阻抗反演来验证的方法，在贝尔凹陷贝西斜坡南屯组中共识别出2个主要由扇三角洲—湖泊体系组成的三级层序：层序Ⅰ相当于南一段，层序Ⅱ相当于南二段。每个层序发育完整，分别由低水位体系域、水进体系域和高水位体系域组成。针对研究区目的层段所划分层序发育的特点，在层序地层单元划分和对比基础上，对不同类型层序格架内的沉积特征和层序地层模式进行了总结，并建立了相应的油气成藏模式。Abstract: Reservoir prediction based on sequence stratigraphy is one of popular and significant research subjects in hydrocarbon exploration. Based on the theory of sequence stratigraphy, comprehensively used the seismic, well logging, core and materials, comprehensively analyzed by wellseismic correlation, and verified by acoustic impedance, two thirdorder sequences which are mainly composed of fan delta lacustrine sedimentary system can be identified in Nantun group of Beier depression：sequence Ⅰequal to K1n1，sequence Ⅱ equal to K1n2. Every sequence develops well and all consist of lowstand system tracts (LST), transgressive system tracts(TST) and highstand system tracts (HST). According to the development characteristics of sequence in the formation in the region of interest, based on the identification and correlation of sequence stratigraphic units, characteristics of sediment and sequence stratigraphic model of different sequence framework are summarized, and the hydrocarbon accumulation model is established.
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