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根据以往钻孔及其测井资料,对鸳鸯湖矿区早—中侏罗世延安期的沉积环境及沉积类型进行了划分:即垂向正层序湖泊三角洲平原相沉积与反层序的三角洲前缘相、湖湾相沉积。前者表现为浅湖泊三角洲的推进,后者表现为浅湖泊三角洲的废弃。其中三角洲平原相沉积类型包括分流河道天然堤沉积组合,决口扇泛滥平原沉积组合,以及泥炭、沼泽沉积组合;三角洲前缘相沉积类型包括河口坝沉积(近端坝、远端坝)、水下分流河道沉积、水下天然堤、分流间湾沉积。通过对比各种沉积组合在自然伽马、视电阻率等测井曲线形态上的反映特征,指出测井曲线异常形态能够反映本区的沉积旋回,并以此总结出了鸳鸯湖矿区的成煤环境、沉积旋回的划分及聚煤规律。
According to the previous boreholes and their logging data, the sedimentary environment and sedimentary types of the early-middle Jurassic Yan’an period in the Yuanyanghu mining area are classified as follows: the vertical positive sequence lacustrine delta plain facies and the reverse sequence delta Fate, Lake Bay deposition. The former shows the promotion of shallow lakes and the latter shows the abandonment of shallow lakes and deltas. Among them, the delta plain sedimentary types include the natural dike sedimentary assemblage of distributary channel, the sedimentary assemblage of brecciated flat flood plains, and the sedimentary assemblage of peat and swamp. The sedimentary types of delta front facies include estuary dam deposition (near dam and distal dam), underwater Distributary channel sedimentation, underwater natural dike, diversion bay deposition. By comparing the reflection characteristics of various sedimentary assemblages in the form of natural gamma ray and apparent resistivity logs, it is pointed out that the abnormal shape of logging curves can reflect the sedimentary cycles of this area and summarize the coal formation in Yuanyanghu mining area Environment, Division of Sedimentary Cycles and Coal Accumulation Rules.