鄂尔多斯盆地东部子洲地区上古生界海相沉积特征研究

Characteristics of the upper Paleozoic marine depositional system in Zizhou area of the eastern Ordos Basin

采用野外观察与室内研究相结合的方法研究子洲地区上古生界海相沉积体系,进而为寻找有利砂体及高产天然气聚集区提供依据.依据研究结果,认为子洲地区上古生界主要发育障壁海岸及浅海陆棚2种沉积体系;在古地理演化过程中,本溪组发育障壁岛-泻湖相;太原组在研究区东部及西南部形成浅海陆棚沉积,在中部和西北部形成潮坪沉积.砂坪及障壁岛虽然分布局限,但发育的砂体物性较好,可以作为天然气储层.

In order to provide basis for searching for favourable sandbodies and natural gas accumulation areas with high yield,the upper Paleozoic marine deposit system is studied by the combination of field observation and laboratory research.It is held that two depositional systems of barrier coast and shallow marine shelf develop in the upper Paleozoic;in the evolution of paleo-geography,barrier isoland-lagoon facies develops in Benxi Formation;shallow marine shelf deposit is formed in Taiyuan Formation in the east and the southwest of the studied area,and tidal-flat deposit is formed in the middle and the northwest of it.Sand flat and barrier island facies distribute in a limited range,but the sandbodies in which there are them have good physical property,they are natural gas reservoirs.