试论控制断陷湖盆陆相层序发育的影响因素  

Study on Influential Factors of Terrigenous Sequence Formation and Development in Fault-depressed Lacustrine Basin

作　　者：胡受权[1] 郭文平[1] 杨凤根[2] 颜其彬[3] 刘树根[4] 童崇光[4] 

机构地区：[1]中山大学地球科学系,广州510275 [2]南京大学地球科学系,南京210093 [3]西南石油学院勘探系,四川南充637001 [4]成都理工学院石油系,成都610059

出　　处：《沉积学报》2001年第2期256-262,共7页Acta Sedimentologica Sinica

基　　金：广东省自然科学基金资助项目!(9941 1 3号 );"油气藏地质及开发工程"国家重点实验室开放基金项目!(PLN992 2号 )资助

摘　　要：以南襄盆地泌阳断陷中新生代陆相层序为例 ,探讨了控制断陷湖盆陆相层序形成和发育的影响因素。研究表明 ,基底构造沉降、物源供给、古气候波动及湖平面变化是控制断陷湖盆陆相层序发育的四大主要因素。在泌阳断陷湖盆中 ,区域性构造运动控制着盆地充填序列及构造层序 ,盆地边界断裂的脉动性控制着地震层序 (层序组 )及层序 ;物源供给速率与可容空间变化速率比值决定着陆相层序单元堆叠型式 ;古气候影响陆相层序发育的作用机理是通过影响物源及湖平面变化而产生效应 ,古气候周期性变迁决定着陆相层序中高频单元的发生、发展和定格 ;湖平面变化是研究断陷湖盆层序地层的主要内容 ,它直接控制着陆相层序诸多几何学方面的特征。Mesozoic Neozoic terrigenous sequence of Biyang fault depression in Nanxiang Basin, is treated as a case to study influential factors of terrigenous sequence formation and development. Basement structural subsidence, sedimentary source recharge, palaeoclimate transformation and lacustrine level change are the four factors which are very important to control terrigenous sequence development in fault depressed lacustrince basin. In Biyang fault depressed lacustrince basin, regional tectonism brought about the formation of basin fill sequence and tectonic sequence and pulsation of basin boundary faults led to the development of sequence sets/sequence. And the rate of source recharge and accommodation variation determined stacking styles of terrigenous sequence units. Palaeclimate influenced the development of terrigenous sequence by the change of sedimentary source and lacustrine level, and its cyclical transformation determined the formation and evolution of high frequency sequence. Lacustrine level change, which is an important subject to study terrigenous sequence in fault depressed lacustrince basin, directly controlled the terrigenous sequence geometrical characteristics. There is a specific dialectical causality between the four factors which are basic to control terrigenous sequence development.

关 键 词：构造沉降 物源供给 古气候 湖平面 影响因素 陆相层序 泌阳断陷 古气候 层序地层学 

分 类 号：P539.2[天文地球—古生物学与地层学] P618.13[天文地球—地质学]