Sedimentary Sequence of the T一R Cycle and A Studied Exampl a in the Continental Faul t Lacustrine Basin
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摘要: 陆相断陷湖盆的沉降机理、湖盆形态等均有别于其它类型的沉积盆地，因此，沉积层序的内部构成及层序边界发育特征也不同。在这种湖盆中，不适合于直接套用“Vail学派”的被动大陆边缘型盆地的层序地层学模式，但其基本原理仍可应用。以东濮断陷盆地为例，分析了盆内构造－沉积旋回之内的湖进－湖退（T－R）旋回沉积层序，这种层序由湖进体系域（LTS）与湖退体系域（LRST）组成。LRST中发育有各种不同类型的储集砂体。由于断陷湖盆的边缘坡度陡峭，以及湖平面升降幅度有限，因此，叠加于构造－沉积族目之上的更高频T－R旋回层序缺乏Ｉ型层序边界，控制T－R旋回发育的主要因素是区内构造（断层）的幕式活动，而更高频的T－R旋回的形成则与米兰柯维奇气候旋回相关联。Abstract: The subsiding mechanism,basin shape and other features of the continental fault lacustrine basin are dif-ferent from those of other sedimentary basins，which results in the difference of the interior constitution ofsedimentary sequence and the feature of sequence boundary. The sequence stratigraphy model from the pas-sive continental-margin cannot be directly applied to the basin,althouth the basic principle of sequence stratig-raphy is still applicable.This paper analysed the sedimentary sequence of the lacustrine transgressive and la-custrine regressive cycle (T-R cycle)from the lacustrine basin of Dongpu，and showed that the sequence iscomposed of the lower lacustrine trangressive system trace (LTST) and upper lacustrine regressive systemtrace(LRST). The reservoir sandbodies of various genetic types were well developed in LTST. The high fre-quency T-R cyclical sequences superimposing on the tectonic sedimentary cycle lacked the Type I sequenceboundary because of the steep margin of the fault basin and the little change of lake level Main factors control-ling the development of the T-R cycle are the episodic movement of structure(fault)and the higher frequenceT-R cycle is related to Milankovitch climate cycle.
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[1] 1 Vail P R,Hardenbol J,Todd R G. Jurassic unconformities.chronos-tratrgraphy, and sea level change from seismic stratigraphy andbiostratigraphy.In:Schlee J S.ed.Interregional unconformities andhydrocarbon exploration. AAPG Memoir.1984.36:129一144
2 Van Wagoner J C. An Overview of the fundamentals of sequencestratigraphy and key definition.In: Wilgus C K, ed. Sea一LevelChanges; An Integrated Approuch. SEPM. Spec. Publ.，1988.42:39-V 45
3 Galloway W E. Genetic stratigraphic sequences in basin analysis I:architecture and genesis of flooding-surface bounded depositional u-nits. AAPG. 1989.73:125-142
4 Johnson J G.Klapper G.Sandberg C A. Devonian eustatic fluctua-tions in Euramerica. Geological Society of America Bulletin, 1985,96:567-587
5 Cross T A. Controls on coal distribution in transgressive-reegressivecycles,Upper Cretaceous.Estem Interior.U. S. A. In; Wilgaus C K,ed. Sea-level Changes; An Integrated Approach. SEPM. Spec.Publ..1988.42:371-380
6 Posamentier M W. Siliciclastic sequence stratigraphic patterns inforeland ramp-type basins. Geology.1993.21:455-458
7 郭建华，曾允孚，翟永红等.新疆塔中石炭系层序地层学研究—一个克拉通内拗陷盆地的层序地层框架模式.地质学报，1996.70(4) :361 -373
8 Shanly K W. McCabe P S. Prespectives on the sequence stratigra-phy of continental siata. AAPG Bulletin.1994,78(4):544-5689
9 Scholz C A, Rosndahl B R, Scott D L. Development of coarse- grained faces in lacustrine rift basins: Examples from East Africa. Geology.1990,18:140-14410
11 李思田，林畅松，解习农等.大型陆相盆地层序地层学研究— 以鄂尔多斯中生代盆地为例.地学前缘，1995.2(3-4):133- 136
11顾家裕.陆相盆地层序地层学格架概念及模式.石油勘探与开 发，1995,22(4):6-10
12黄汲清，任纪舜，姜春发等.中国大地构造基本轮廓·地质学报， 1977,51(2)17一135
13朱夏.我国陆相中新生界含油气盆地的大地构造特征及有关间题.大地构造问题.北京:科学出版社，1965. 10-15
14 王鸿祯，李光岑编译.国际地层时代对比表.北京:地质出版社1990
15 郭建华，郭成贤，翟永红等.东淮凹陷前梨园地区Es34-Es33豆亚段沉积旋回与沉积体系.石油实验地质，1996,18(4):377-384
16 Hays J O,Imbrie J,Shackleton N J. Varations in the Earth's Or-bit;pacemaket of the ice ages. Science,1976.194:1 121-1 130
17 Olsen H. Astronomical forcing of meandering river behaviour:Mi-lankovitch cycles in Devonian of East Greenland. Palaeogeo.Palaeoeco.1990,79:99一115. -
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