四川盆地震旦系灯影组自川中高石梯-磨溪地区取得重大突破之后展现出巨大勘探潜力.当前川北灯影组仍处于探索阶段,为探讨川北震旦系天然气勘探潜力,通过钻井、岩心、野外剖面及地震资料综合解释,从烃源岩条件、沉积特征、储层特征和圈闭特征等方面讨论川北震旦系成藏地质条件.研究表明:川北地区下寒武统烃源岩厚度大,分布广,具备形成大中型气田的物质基础;古裂陷边缘灯影组丘滩复合体叠加古岩溶形成的优质储层广泛发育;盆内构造变形弱,盖层厚度大,保存条件较好;构造和岩性圈闭均发育,且资源量大.综合区域成藏条件研究,预测了川北灯影组有利勘探方向及区带,为该地区震旦系天然气勘探突破提供了依据.%The Sinian Dengying Formation in Sichuan Basin shows a great exploration potential after the major breakthrough in Gaoshiti-Moxi. Currently,the Dengying Formation in the Northern Sichuan Basin is still in the ex-ploratory stage. The comprehensive interpretation of drilling,core analysis,field profile observation and seismic da-ta are used to probe the geological hydrocarbon accumulation conditions of Sinian strata in the northern Sichuan Ba-sin from source-rock conditions,sedimentary features,reservoir properties,trap properties and other aspects. Re-search indicates that the Lower Cambrian source-rocks in the northern Sichuan Basin are featured by large thickness and wide distribution,which lays a material basis for medium-large scale hydrocarbon accumulation. The high-quality reservoirs with wide development are superimposed by mound-shoal complex and ancient karst in Dengying Formation of ancient rift edge.The tectonic within the basin is characterized by weak deformation,large thickness of cap-rock and relatively well preservation conditions.Structural and lithologic traps with large hydrocarbon resources are well developed.The favorable exploration direction and zone of Dengying Formation in the Northern Sichuan Ba-sin are predicted by combining with the regional hydrocarbon accumulation conditions,which could provide certain reference for the Sinian gas exploration breakthrough in this area.
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