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乌什凹陷白垩系舒善河组地层岩性差异较大,沉积环境和沉积相变化快,导致了地层对比困难,物源方向及沉积相展布特征不明确。本次研究首次将高分辨率层序地层学原理和方法应用到该区白垩系舒善河组物源及沉积相特征研究中,充分利用岩心、测井等资料,以高分辨率层序地层学为指导,在白垩系舒善河组内识别出1个层序界面,划分出2个三级层序4个体系域,建立了该区白垩系舒善河组单井和连井层序地层格架;明确了物源主要来自于南部温宿凸起和工区西部,局部断层形成的低隆为次级物源区;厘定了沉积环境和砂体展布主要受古地形、古物源和古水深的影响,发育有扇三角洲和辫状河三角洲、浅水湖泊3大类沉积相类型,形成了包括S1地区、S2地区、S3地区在内的3套沉积体系。
The Cretaceous Shushanhe formation in the Wushi Depression is quite different in lithology, with rapid changes in sedimentary environment and sedimentary facies, leading to difficulties in stratigraphic correlation and poorly defined characteristics of provenance and distribution of sedimentary facies. This study, for the first time, applies the principles and methods of high-resolution sequence stratigraphy to the study of the source rocks and sedimentary facies of Cretaceous Shuhehe Formation in this area. It makes full use of the data of core and well logging, and uses high-resolution sequence stratigraphy as In the Cretaceous Shushanhe Formation, a sequence boundary is identified, and two third-order sequences and four system tracts are identified. The single-well sequence and succession sequence stratigraphy of Cretaceous Shuhehe Formation are established. The source rocks are mainly from the southern Wensu bulge and the western part of the work area, and the low-long local fault zone is the secondary source area. The sedimentary environment and distribution of the sand body are mainly influenced by paleo-topography, antiquity and paleo-water depth and development There are three types of sedimentary facies such as fan delta, braided river delta and shallow lake, forming three sedimentary systems including S1, S2 and S3.