利用地震地貌学刻画古喀斯特地貌  

Using seismic geomorphology to characterize paleo-karst landforms

作　　者：张宏[1] 董宁[1] 宁俊瑞[1] 武丽 国庆鹏 张永贵 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院.北京100083

出　　处：《石油地球物理勘探》2010年第A01期125-129,共5页Oil Geophysical Prospecting

摘　　要：地震地貌学以多种地震平面成像技术和几何属性分析技术为基础,以现代沉积地貌研究成果为指导,通过不同等时格架内地震平面图像揭示地层沉积演化规律,以期通过地震图像获取更多有关沉积地层方面的信息。本文采用地震地貌学的研究流程和配套技术方法,综合运用多种地震几何属性提取技术和平面成像技术,对鄂尔多斯盆地东部富县区块奥陶系碳酸盐岩的喀斯特古地貌进行刻画分析,定量描述了不同尺度级别的树枝状排水沟槽的平面分布。结果表明:总体上研究区奥陶系古地貌呈"西高东低"特征,残存厚度则表现为"东厚西薄",古喀斯特地貌主要集中于研究区中西部,东北有零星分布;西北部发育一条负向主沟槽,沟槽宽为300～860m,切割深度为20～45m,自西向东南延伸至中部岔分为两支次级沟槽,在主沟槽附近还发育多条分支沟槽,但平面延伸距离不长;其他区域为正向地貌单元区或平地,曲率体切片色调的变化精细刻画了各类残丘地貌。Based on seismic plane imaging techniques and geometrical attribute analysis technique,and directed by modern sediment and geomorphology research results,the seismic geomorphology discloses the strata sediment and evolution laws through seismic plane images in different isochrohal frame in order to acquire more information on sediment strata through seismic images.By using the research flowchart and auxiliary techniques in seismic geomorphology and integratedly applying the seismic geometrical attribute extraction technique and plane imaging technique,the Ordovician carbonate paleo-karst landforms in Fuxian County,east of Ordos Basin were described and analyzed in this paper.The plane distribution of the dendritic draining groove with different scales were quantitatively described.The research results indicate that the Ordovician paleo-karst landforms in this area show higher elevation in the west and lower elevation in the east,the residual thickness is thicker in the east and thinner in the west,the paleo-karst landforms mainly distribute in the middle west,a few in the northeast,a valley was developed in the northwest of the area,its width is about 300～860m,cutting depth is 20～45m,it extends from west to the southeast and it branches to two sub-valleys,beside the main valley many branch valleys were developed,but they do not extend too long,the other parts of the area are positive landform unit section or the plain,the color changing of the curvature delineate every kinds of hammock in detail.

关 键 词：地震地貌学 地震属性 地震切片 鄂尔多斯盆地 奥陶系 古喀斯特地貌 

分 类 号：P534.46[天文地球—古生物学与地层学]