四川盆地南部下三叠统飞仙关组一段台内鲕滩的主控因素  

Main controlling factors for intraplatform oolitic bank of the Member 1 of Lower Triassic Feixianguan Formation in southern Sichuan Basin

作　　者：谭秀成[1] 牟晓慧[1] 罗冰[1] 刘宏[1] 刘晓光[1] 丁熊[1] 吴晓庆[1] 吴兴波[1] 

机构地区：[1]西南石油大学资源与环境学院,四川成都610500

出　　处：《古地理学报》2010年第1期49-55,共7页Journal of Palaeogeography：Chinese Edition

基　　金：中国石油天然气集团公司中青年创新基金项目(编号:06E1048);四川省重点学科建设项目(编号:SZD0414)共同资助

摘　　要：四川盆地飞仙关组台缘鲕滩气田的发现,激励了人们重新认识台内鲕滩的发育分布规律及其勘探前景。根据野外露头及钻孔资料的分析,认为四川盆地南部飞仙关组一段的台内鲕滩具有发育向上变浅序列、单滩体厚度一般小于3m、横向连续性较差的特征。着重分析了沉积期古地貌、古水深、海水动荡程度以及古海平面相对升降变化对台内鲕滩的控制作用,并把滩体的发育阶段分为雏滩期(低速建造期)、滩核期(高建造期)及衰亡期3个阶段。结果表明,在缓慢等效的海退过程中,处于高能沉积界面附近的水下古高地有利于台内鲕滩的形成,继承性的泸州古隆起核部是区内有利的滩体发育区,形成的台内滩体具有一定的厚度规模和较大的分布面积。这一认识可为该区飞仙关组台内鲕滩的下一步勘探提供必要的地质支持。The discovery of gas fields of oolitic bank on the platform edge of the Feixianguan Formation in the Sichuan Basin, encourages people re-recognizing the development and distribution regularity and exploration prospect of the intraplatform oolitic bank. This paper taks the using outcrops and borehole data, summarized the features of the bank on the platform in the Member 1 of Feixianguan Formation in southern Sichuan Basin as follows： the shoaling-upward sequence of the intraplatform oolitic bank, the thickness of a single bank is less than 3,m, the horizontal continuity is relatively poor.After further analyses and discussion, the authors proposed the development and distribution of the oolitic banks within the platform were controlled by the depositional palaeogeomorphology, water depth, turbulence of sea water and fluctuation of sea level, and divided the development of bank into three stages：the young bank time（low speed construction time）, bank nuclear time（the high construction time）and the decline phase. The results show that the Luzhou Palaeohigh is the favorable region to develop the intraplatform oolitic bank during the slow equivalent regression process, moreover,the bank formed was characterized by a large thickness and wide distribution area.This recognition provides necessary geologic support for further exploration of oolitic bank on the platform.

关 键 词：台内鲕滩 主控因素 飞一段 泸州古隆起 四川盆地 

分 类 号：P588.245[天文地球—岩石学]