富县地区延长组高分辨率层序地层分析

以高分辨率层序地层学原理为指导，通过对野外露头、钻井岩心及测井资料的综合研究，在层序界 面识别的基础上，将富县地区延长组划分为 1 个超长期、4 个长期、22 个中期旋回层序及若干个短期旋回 层序。 其短期旋回层序可细分为非对称型和对称型 2 种基本类型及 7 种亚类型，并详细分析了不同短期 旋回的堆砌样式、沉积相及空间分布模式。 选择中期旋回层序界面和最大湖泛面作为等时地层对比的优 选位置，建立了高分辨率层序地层格架，为研究区砂体、烃源岩展布规律研究提供了一定的理论依据。

High resolution sequence stratigraphy of Yanchang Formation in Fuxian area,Ordos Basin

Under the guidance of high resolution sequence stratigraphy theory,based on field crop,cores and well logging data,the Yanchang Formation in Fuxian area can be divided into one super long-term sequence cycle（SLSC）,four long-term sequence cycles（LSC）,22 middle-term sequence cycles（MSC） and several short-term sequence cycles（SSC）.The short-term sequence cycles can be subdivided into two species and seven subspecies.We analyzed the styles,sedimentary facies and spatial distribution of the different short-term sequence cycles.We chose middle-term sequence interfaces and max flooding surfaces as correlation interfaces in stratigraphic correlation,and established the sequence stratigraphic framework of Yanchang Formation in Fuxian area,which can provide a theoretical basis for recognizing the distribution of sand bodies and source rocks.