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结合整个鄂尔多斯盆地的构造及沉积演化特征,对鄂尔多斯盆地冯地坑-洪德地区上三叠统延长组长6油层组沉积相类型和特征进行分析,建立长6油层组沉积模式,对其岩石类型、砂岩的岩石结构、沉积构造、古生物及测井相等相标志进行详细研究。研究表明,冯地坑-洪德地区长6沉积时期发育着一套曲流河三角洲沉积体系,曲流河三角洲发育三角洲前缘和三角洲平原2种亚相;三角洲平原沉积砂体以细砂和粉砂为主,最粗可达到中砂级,其中可见到分支河道微相,陆上天然堤微相及沼泽微相。三角洲前缘砂体以细砂-粉砂为主,发育有水下分支河道、水下天然堤、支流间湾、河口砂坝和前缘席状砂5种微相。
Based on the tectonic and sedimentary evolution characteristics of the Ordos Basin, the sedimentary facies types and characteristics of the Chang 6 oil layer of the Upper Triassic Yanchang Formation in the Fengdikeng-Hunde Area, Ordos Basin are analyzed, and the sedimentary model of Chang 6 reservoir is established. Type, rock structure of sandstone, sedimentary structure, palaeontology and well logging equivalent phase sign for a detailed study. The results show that there are a series of meandering river delta sedimentary systems in the Changdian-Hunde area during the depositional period of the Chang 6 sedimentary system, the delta front in the meandering delta and two subfacies in the delta plain. The sedimentary sand bodies in the delta plain are composed of fine sand and powder Sand-based, the most coarse can reach the sand level, which can be seen in the branch channel microfacies, onshore natural dike and swamp microfacies. The delta front sand body mainly consists of fine sand and silt, with five kinds of microfacies including underwater branch channel, underwater natural dike, tributary bay, estuary sand dam and leading edge sands sand.