作　　者： (陈粤）; (黄文芳）; (梁裕平）; (邓宾）;

机构地区： 广西壮族自治区地质调查院,广西南宁530023

出　　处： 《矿产与地质》 2017年第3期605-612,共8页

摘　　要： 为了弄清研究区目的层系鹿寨组一段的沉积特征与沉积环境,以沉积岩石学、石油地质学等为理论基础,以野外路线地质调查和4条实测剖面、岩石矿物组分等分析测试资料为手段,系统研究了桂中坳陷鹿寨地区下石炭统鹿寨组一段黑色泥页岩的发育特征与空间展布规律以及沉积环境。研究表明:桂中坳陷鹿寨地区下石炭统鹿寨组一段岩性以灰黑色泥页岩、硅质页岩、炭质硅质页岩等为主,是研究区页岩气勘探的主力层系,沉积环境为浅海陆棚深水陆棚相。页岩矿物组成以石英、长石为主,含量介于50%~84.6%,平均值为64.79%,其次为长石,主要包括钾长石和斜长石,总量介于0%~12.1%,平均为2.8%,黏土矿物含量介于15.9%~42.7%。由此可见,泥页岩以脆性矿物为主,有利于泥页岩在构造应力作用下,容易形成微裂缝,从而成为潜在页岩气的有利区。因此对其开展泥页岩特征与沉积环境研究具有十分重要的沉积学与油气地质学意义,为页岩气的进一步勘查提供了依据。 The aim of study was to understand the sedimentary characteristics and sedimentary environment of target strata in the research area.On the theoretical basis of sedimentary petrology,petroleum geology sequence stratigraphy,by combinations of field geological survey and analyses of rock and mineral compositions,this paper systematically studies the development characteristics and spatial distribution of black shale in the section of Luzhai Formation in Lower Carboniferous in Luzhai area,Guizhong depression,and the depositional environment.The result showed that the lithology of the first member of Luzhai Formation is mainly mud-shale,siliceous shale,and carbonaceous siliceous shale of greyblack,of which belong to the shallow sea shelf deep-water shelf sedimentary phase,and is the main series of shale gas exploration in Guizhong depression.The brittle minerals of the siliceous shale are mainly quartz and feldspar,quartz are 50%to 84.6%,average of 64.79%,followed by feldspar,mainly including potassium feldspar and plagioclase,0%to 12.1%,total average of 2.8%.Content of clay minerals are 15.9%to 42.7%.It is advantage for these mud shale to form microcracks under tectonic stress,and become advantage area of shale gas potential.So the study of characteristics and sedimentary environment of black mud-shale is of great important to sedimentology and petroleum geology,providing a basis for further exploration of shale gas.

关 键 词： 黑色页岩 沉积特征 页岩气 鹿寨组一段 桂中坳陷