【摘要】 依据露头、测井、岩芯资料研究发现 :鄂尔多斯盆地富县地区延长组第 6段地层是继长 7段湖泊扩展之后的高位体系域沉积。长 6段时期发育了 3次小型湖泛事件。小型湖泛面将长 6段地层分为 4个小层序 ;各小层序内部都发育湖泊体系和三角洲体系。三角洲从东北向西南进积 ,湖泊位于探区西南部。长 64 、长 63时期发育牛武三角洲 ,长 62 、长 61 时期发育直罗三角洲和牛武三角洲。分流河道发育情况控制了三角洲朵体的大小和位置。更多还原

【Abstract】 Based on the study of outcrop, logging and rock core, we’ve found that the 6th Segment of Yanchangzu in Fuxian District, Ordas Basin, was a sediment at perch system after the expansion of the 7th lake. Three minor lake floods were developed at the 6th period. The minor lake floods divided the stratum of the 6th segment into 4 tiny sequences, and the lakes and delta system were developed within each tiny sequence. The deltas stretched from northeast to southwest while the lakes lay in the west. The Niuwu Delta was developed at the 64 and the 63period and Zhiluo Delta and Niuwu Delta were developed at the 62 and the 61 period. The size and location of the deltas were controlled by distributary watercourses.更多还原