Sequence-Based Lithofacies and Paleogeographic Characteristics and Evolution of Permian in South China
-
摘要: 在层序地层研究基础上,以沉积体系域和相关界面为编图单元,采用体系域压缩法和瞬时作图法,以油气勘探为目标,有针对性的编制了中国南方二叠纪11张层序岩相古地理图。在此基础上,全面系统地阐述了该区二叠纪层序岩相古地理特征及演化。结果表明,中国南方二叠纪层序古地理演化具有明显的继承性、不均一性、阶段性、方向性和同步性。与传统的岩相古地理图相比,层序岩相古地理图具有动态、精确、等时、成因连续和勘探实用等优点。Abstract: Based on the research on sequence stratigraphy of Permian in the south China with the purpose of oil-gas exploration,11 sequence-based lithofacies and paleogeography maps of Permian in the south china have been drawn up by ways of condensation and instantenity with mapping units of sedimentary systems tracts and key sequence boundary surfaces.In the light of sequence-based lithofacies and paleogeography maps,the characteristics and evolution of Permian sequence-based lithofacies and paleogeography have also been discussed in detail.The authors suggest that the evolution of sequence-based lithofacies and paleogeography of Permian bave obvious characteristics of inheritance,inhomogeneity,phase,orientation and synchronism.Inheritance is that the distrbutive feature of sea and land area.the extension direction and distrbutive precipitation of sedimentary facies zone of each stage of Lower Permian are approximately consistent with the tectonic setting and paleogeographic framework of Devonian and Carboniferous.The inhomogeneity shows that there are different characteristics and development process in different sedimentary basin.The phase indicates that the evolution of sequence-based lithofacies and paleogeography can be divided into 2 phases and 11 stages.The tectonic setting,basin feature and paleogeography of Upper Permian are different from that of Lower Permian,but in different depositional area,the development stags is similar.The paleogeography feature of Upper Permian is related to that of Lower Permian,and the evolution and development of biota approximately keep consistence with that of paleogeography. Compared to traditional lithofacies and paleogeography map sequence-based lithofacies and paleogeography map owns distinct advantages fo accuracy,isochronity,genetic succession and exploratory practicality etc.It deeply reflects the sedimentation,tectonic movement,sea-level change,distribution and evolution of sea and land, volcanic action and oil-formation etc.It also reasonably discloses the relationship of corrosion exposure field of old landmass and the development of sedimentary system with sea-level change and synsedimentary tectonic movement,and vividly describes the special distrbution and evolution of the sedimentary facies zone of coverage area.especially potential oil source,reservoir and cover,Clearly,sequence-based lithofacies and paleogeography map not only objectively and dynamically reflects the basin forming,development and evolution process but also have significant practical significance oil-gas exploration.
-
[1] 1 曾允孚, 刘文均, 陈洪德. 华南右江复合盆地的沉积构造演化[M]. 北京:地质出版社, 1993. 1～10
2 刘宝君, 许效松. 中国南 方古大 陆沉积 地壳演 化与 成矿[M]. 北京:科学出版社, 1993. 79～100
3 殷鸿福. 扬子区晚二叠世 -中三叠世海平面变化[J]. 地球科学,1994, 1(2):1～9
4 陈洪德, 曾允孚. 右江盆地的性质及演化讨论[J]. 岩相古地理,1990, (1):28～37
5 王立亭. 中国南方二叠纪岩相古地理与成矿作用[M]. 北京:地质出版社, 1994～1995
6 李文汉. 层序地层学与岩相古地理编图[J]. 岩相古地理, 1992, 12(1):10～29
7 刘鸿允. 中国古地理图集[M]. 北京:地质出版社, 1955
8 王鸿祯等. 中国古地理图集[M]. 北京:科学出版社, 1985
9 Chen Hongde, Q in Jinxion and Tian Jingchun. Permian sequencestratigraphy of the Sichuan -Yunnan -Guizhou -Guangxi Region[J]. Scientia Geological Sinica, 1997, 6(3):241～261
10 Tian Jingchun, C hen Hongde, Q in Jianxion. Sequencce -basedlithofacies paleogeog raphy of Permian in the SichuanYunnan -Guizhon -Guangxi Region[J]. S cientia Geological S ini ca, 1997, 6(3):262～282
11 Q in Jianxong, C hen Hongde, Tian Jingchun. Reet and gravity flowSediments on Permian slopes in the Sichuan -Yunnan -Guizhon -Guangxi Region[J]. S cientia Geologi cal Sinica, 1997, 6(3):292～298
12 Chen Hongde, QinJianxiong and Tian Jingchun. Permian sedimen-tary basi ns and regional sedimentary models i n the Sichuan -Yun-nan -Guiznou -Guangxi Region and correlation of sea levelchanges[J]. Scientia Geologica Sinica, 1997, 6(3):283～292 -
点击查看大图
计量
- 文章访问数: 642
- HTML全文浏览量: 9
- PDF下载量: 812
- 被引次数: 0
下载:
