【摘要】 在江汉盆地潜江凹陷潜江组发育盐间非砂岩油气藏。江陵凹陷沙市组也沉积了一套含盐地层,但盐间非砂岩油气藏发育程度不如潜江组。沉积特征、成藏条件和成藏机制研究发现,两套含盐地层及其盐韵律特征的差异受构造环境、古气候环境控制。潜江组沉积时期,断陷活动强,形成补偿或欠补偿的深水沉积环境,利于有机质堆积,盐韵律特征由纯盐岩层和盐间深灰色泥岩、油页岩、含芒硝白云岩和白云岩等组成,深灰色泥岩、油页岩为有利烃源岩,含芒硝白云岩和白云岩等为有利储集层,具备形成盐间非砂岩油气藏的条件。沙市组沉积时期,断陷活动弱,气候干旱,形成补偿到过补偿的沉积环境,盐韵律由含膏盐岩、膏质盐岩和盐间紫色、灰色泥岩或含芒硝泥岩组成,烃源岩和储集层条件较差,但其下段上部的一套灰色盐岩、膏岩夹灰色泥岩组成的盐韵律层存在勘探潜力。图6表1参18更多还原

【Abstract】 Non-sandstone reservoirs within salt-layers of self-generation and self-storage exist in Qianjiang Formation.Salt also deposit in the Shashi Formation of Jiangling Sag,but non-sandstone reservoirs poorly developed.The different characteristics of the two formations and their rhythms are controlled by tectonic environments and paleoclimates.In the Qianjiang Formation,the strong faulting causes a deep-water compensation or insufficient-compensation depositional environment favorable for organic matter to deposit.The saline rhythm consists of pure salt rock and non-sandstones within salt rock,such as dark-grey mudstone,oil shale,glauber-bearing dolomite and dolomite.Because of the source rocks of mudstone,the reservoir of oil shale and dolomites,the non-sandstone reservoir has a great exploration potential.In Shashi Formation,the faulting is weak and the climate dry,leading to a compensation or overcompensation depositional environment unfit for organic matter to deposit.The saline rhythm consists of gypsum-bearing salt rock and purple or gray mudstone or glauber-bearing mudstone.Poor source rock and reservoir indicates a poorer exploration potential than that in the Qianjiang Formation.更多还原