鄂尔多斯盆地白垩系沉积建造

doi:10.11743/ogg20060205

摘要/Abstract

摘要：

鄂尔多斯盆地在白垩纪时期与外围六盘山、河套盆地相隔,是独立的非均衡坳陷盆地。盆地以南北向为轴,盆缘斜坡东缓西陡,盆地轴面西倾,沉降中心位于西侧,沉降中心区沉积厚度明显大于周缘抬升区。不对称结构和沉积环境演化不仅控制了盆内岩性、沉积相及地层分布,导致盆缘以冲积扇、河流相和三角洲平原分流河道相砂砾岩和砂岩沉积为主,盆内为风成沙漠相、三角洲前缘相和湖泊相的砂岩和泥岩。下白垩统平面展布受盆地升降运动、剥蚀与残留变化规律影响,盆地东部和边缘剥蚀作用强,残留厚度小,腹部及西部坳陷区地层发育全,保留厚度大,以洛河组分布最广,其次是环河华池组,罗汉洞组及泾川组仅残留在西部和北部坳陷区。

关键词: 沉积相, 沉积建造, 白垩系, 鄂尔多斯盆地

Abstract:

Ordos basin was separated from the adjacent Liupanshan and Hetao basins in Cretaceous,thus it was a separated non-equilibrium downwarped basin.The basin has a north-south axis with west-dipping axial plane and the basin-margin slope being gentle in the east and steep in the west.The center of subsidence is located in the western side of the basin,where the sedimentary thickness is obviously larger than the surrounding uplifted zone.The asymmetrical structure and evolution of sedimentary environment have not only controlled the lithology,sedimentary facies and distribution of strata in the basin,but also resulted in the basin margin to be dominated by glutinites and sandstones of alluvial fan,fluvial,delta plain and distributary channel facies,while the inner part of the basin to be dominated by sandstones and mudstones of eolian desert,delta front and lake facies.Elevation and subsidence,denudation and relief would have influenced the plane distribution of Lower Cretaceous.The thickness of residual sediment is thin in the eastern part and margin of the basin,while it is thick and completely preserved in the downwarping regions in central and western parts of the basin.The Luohe Formation is the most widely distributed,followed by Huanhehuachi Formation,while Luohandong and Jingchuan Formations have only been partially preserved in the downwarping regions in the west and in the north.

Key words: Cretaceous, sedimentary facies, sedimentary formation, Ordos basin

中图分类号:

TE111.3

杨友运. 鄂尔多斯盆地白垩系沉积建造[J]. 石油与天然气地质, 2006, 27(2): 167-172. doi: 10.11743/ogg20060205 Yang Youyun. Cretaceous sedimentary formation in Ordos basin[J]. Oil & Gas Geology, 2006, 27(2): 167-172. doi: 10.11743/ogg20060205

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