鄂尔多斯盆地侏罗系延安组延10沉积特征

基于现代沉积学理论，采用野外辫状河露头剖面观察实测的方法，并结合钻井资料，对延安组延10岩相类型、岩相组合和沉积特点进行详细研究，探讨研究区沉积相、微相和沉积模式。结果表明：研究区延10组发育4种岩相类型，包括槽状交错层理中粗砂岩相(St)、板状交错层理砂岩相(Sp)、平行层理砂岩相(Sh）和块状构造砂岩相(Sm)及辫状河岩相组合；另外，识别出辫状河沉积相以及心滩、泛滥平原2种沉积微相。研究结果对延安组辫状河岩相组合和沉积相具有一定的指导意义，同时为鄂尔多斯盆地其他层位辫状河沉积研究提供借鉴。

Sedimentary Characteristics of Yan 10 of Jurassic Yan'an Formation in Ordos Basin

Based on the modern sedimentology theory, the lithofacies types, lithofacies combinations and sedimentary characteristics of Yan10 in Yan ''an Formation are studied in detail by means of field observation of braided river outcrop section and drilling data, and the sedimentary facies, microfacies and sedimentary model in the study area are discussed. The results show that four lithofacies types are developed in Yan10 Formation in the study area: coarse sandstone facies (St) in trough cross-bedding, tabular cross-bedding sandstone facies (Sp), parallel bedding sandstone facies (Sh), massive structural sandstone facies (Sm) and braided river lithofacies association. In addition, braided river sedimentary facies, heart bank and flood plain sedimentary microfacies are identified. The research results have certain guiding significance for the Yan ''an Formation braided river lithofacies association and sedimentary facies, and could provide reference for other layers of braided river deposition in Ordos Basin.