江汉盆地潜江组与沙市组盐间非砂岩油气藏勘探潜力对比  

Exploration potential contrast of non-sandstone reservoirs within salt-layers between Shashi and Qianjiang Formations,Jianghan Basin

作　　者：陈波[1] 肖秋苟[2] 曹卫生[3] 赵海涛[1] 

机构地区：[1]长江大学地球科学学院 [2]中国石化中南分公司 [3]中国石化江汉油田分公司勘探开发研究院

出　　处：《石油勘探与开发》2007年第2期190-196,共7页Petroleum Exploration and Development

基　　金：国家自然科学基金项目(40572078)

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。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 nonsandstone 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.

关 键 词：江汉盆地 盐间非砂岩油气藏 盐岩层 自生自储 勘探潜力 

分 类 号：TE122.2[石油与天然气工程—油气勘探]