【摘要】 腰英台地区营城组一段火山岩气藏为火山机构内幕型气藏,其储层分布受火山机构控制.本文以旋回作为时间格架进行火山机构的精细划分.首先通过钻井火山岩岩性、岩相、测井资料识别出的旋回间风化壳和沉积岩夹层等地质界面,地震剖面上全区发育的连续强反射同相轴等划分火山岩的旋回.然后,在旋回内部根据不同钻井岩性、岩相的变化以及火山机构的地震相特征识别火山机构,由地震同相轴的不整合相交和倾角相背等现象划分火山机构间界线.最后,在火山机构内部划分期次,通过钻井中相序分析,测井资料识别出的风化壳、烘烤边、冷凝边和蚀变带等地质界面等划分火山岩期次,并通过追踪火山机构内部较连续的强反射同相轴分析期次的空间展布特征.综合运用上述的地质-地球物理方法,共将腰英台地区火山岩划分为4个旋回、8个火山机构及26个期次.以期次作为地震上可以识别的控制岩相、储层空间展布特征的最小单元,结合地震相、钻井岩相及储层特征,对研究区火山机构内部岩相、储层进行了解剖.本文探讨的以旋回为格架的火山机构精细划分及以期次为单元的内部岩相、储层解剖对寻找有利储层及指导水平井沿储层钻探具有借鉴价值.更多还原

【Abstract】 The volcanic gas reservoirs of the First Member of the Yingcheng Formation are controlled by volcanic edifices insider in Yaoyingtai area.In this paper,we take the cycles as the time-framework for the fine dividing of the volcanic edifices.First,we can divide the cycles using lithology and lithofacies in the well,the geological surfaces like weathering crust,sedimentary interbed and so on by logging method,and the continuous strong reflection on seismic sections of seismic events which can be traced in the whole region.Second,we can identify the volcanic edifices in the cycles by the differences of lithology and lithofacies in different wells,and the seismic phase characteristics of the volcanic edifices,and divide the boundary of the adjacent volcanic edifices by the unconformable intersection or angle contrary of the seismic events.Last, in the volcanic edifices,we can divide the stages via the facies sequence in wells,the weathering crust,baking border,chilled border,alteration zone identified by logging,and the basically continuous strong reflection of seismic events in the volcanic edifices.Using the geology-geophysical methods synthetically,the volcanic rocks can be divided into four cycles,eight volcanic edifices and twenty-six stages in Yaoyingtai area.Take the stages as the minimum unit for controlling lithofacies and the reservoir spatial distribution characteristics which can be identified by seismic data.Combined with the seismic facies,the drilling lithofacies and reservoir characteristics,we can dissect the volcanic edifices step by step,including lithofacies and reservoir inside the volcanic edifices.Dividing the volcanic edifices in cycles framework and researching insider lithofacies and reservoir characteristics in the unit of stages has reference value for finding favorable reservoir and guiding the horizontal well drilling which need to drill along the reservoirs.更多还原