四川盆地北部震旦系天然气勘探潜力分析  

Sinian Natural Gas Exploration Potential Analysis in the Northern Sichuan Basin

作　　者：李辉[1] 朱祥[1] 李毕松[1] 梅庆华 

机构地区：[1]中国石化勘探分公司,四川成都610041

出　　处：《特种油气藏》2018年第1期52-57,共6页Special Oil & Gas Reservoirs

基　　金："十二五"国家重大专项"大型油气田及煤层气"子课题"南方海相碳酸盐岩大中型油气田形成规律与勘探评价"(2011ZX05005-003)

摘　　要：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 exploratory stage. The comprehensive interpretation of drilling, core analysis, field profile observation and seismie data are used to probe the genlogical hydrocarbon aeeumulatinn conditions of Sinian strata in the northem Sichuan Basin from source-rock conditions, sedimentary features , reservoir properties, trap properties and other aspcets , Research 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 aceumulation. The highquality 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-roek and relatively well preservation conditions. Struetural and lithologic traps with large hydrocarbon resources are well dew,loped. The favorable exploration direction and zone of Dengying Formation in the Northern Sichuan Basin are predicted by combining with the regional hydroearbon accumulation conditions, which could provide certain reference for the Sinian gas exploration breakthrough in this area.

关 键 词：成藏条件 资源潜力 有利区带 震旦系 川北地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探]