Guided by the deposition theory of the sandy debris flow,the geological characteristics of the Sha1 Member reservoir in PG2 Block of Nanpu Sag was studied to clearly put forward the depositional pattern of sandy debris flow,reservoir characteristics,and meticulous depiction of the distribution of the interlayers using the rock cores,detection logging,seismic,analysis assay and production test data.The research results show that:the sandy debris flow mainly performs as domal deposition;it is thick in the middle and thin on the flanks;vertically it is usually overlapped by multi-cycles of sandbodies and blanket distribution in plane,the single sand body is thick and has good connectivity;the reservoir lithology is mainly sandy conglomerate and coarse sandstone,mainly belongs to low porosity and middle-low permeability reservoir and has strong intra-layer heterogeneity;the reservoir space is predominantly secondary solution pores with subordinate primary porosity and crevice;reservoir physical property is mainly controlled by sedimentary micro-facies,lithofacies and reservoir diagenesis;the reservoir interlayer mainly includes lithologic and physical property interlayers and discontinuously distributes on the sides of main water channel and outer fan and has low division ability;the sandbodies unite and overlay in the vertical and the reservoir is the thick massive reservoir with some layered characteristics.The research results have important guiding significance for the development of future reservoir development technology policy and the research of similar reservoirs.%以砂质碎屑流沉积理论为指导,综合运用岩心、测录井、地震、分析化验和生产测试等资料,开展南堡凹陷堡古2区块沙一段油藏精细解剖研究,落实砂质碎屑流沉积砂体发育样式和储层特征,精细刻画油藏内部隔夹层分布规律,明确油藏特征.结果表明:研究区砂质碎屑流表现为丘状沉积,中间厚、两端薄,垂向上为多期扇体叠置,平面上储层砂体呈毯状分布,单层厚度大、连通性能好;储层岩性主要为砂砾岩和粗砂岩,总体属于低孔中低渗储层,层内非均质性较强,储层储集空间类型以次生溶蚀孔隙为主,含少量原生粒间孔隙和裂缝,储层物性主要受沉积微相、岩相和成岩作用控制;隔夹层包括岩性和物性2类,主要呈不连续分散状分布于主水道两侧和外扇,对油藏分割作用差,储层砂体上下切叠连通,油藏整体表现为具有一定层状属性的准块状油藏.研究成果对后续油藏开发技术政策的制定以及同类油藏研究具有重要的指导意义.
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