为揭示柴北缘航垭地区的聚煤规律,利用岩心资料对其沉积相、层序地层及聚煤作用进行研究:共识别出5种岩石类型、17种岩相类型,及识别出的河流沉积体系、三角洲沉积体系、湖泊沉积体系,并以区域不整合面、河流下切谷砂岩底面为界面,将石门沟组划分为2个3级层序,分别对应石门沟组下段和石门沟组上段。研究表明:该区煤层形成于湖侵过程中上三角洲平原泛滥盆地和下三角洲平原分流间湾沼泽,在盆地边缘河流—三角洲平原,厚煤层(G2煤)靠近最大湖泛面发育,中厚煤层(G3煤)形成于湖侵体系域的中期;在盆地内部,煤层(G1煤较薄)常靠近初始湖泛面发育。

In order to unveil the accumulation law of coal in Hangya area of Qaidam basin, By using borehole data, the paper studied its sedimentary facies, seque nce stratigraphy and coal accumulation characteristics.A total of 5 rock types and 17 lithofacies types ware identified.Fluvial, delta and lacustrine depositional systems and related facies were recognized. Three sequence boundaries were identified based on the development of regional unconformity and the base of incised valley fill sa ndstones.The coal measures were subdivided into 2 third-order composite sequences, corresponding lower and upper members of the Shimengou Formation.The result s showed that the interdistributary bay of the lower delta plain, and the back swamp of the fluvial-upper delta plain were the main environments for coal accumulation in Hangya area.In the basin margin, which was dominated by a fluvial-delta plain setting, the thick coal (G2) was developed around the maximum flooding surface, while t he moderately thick coal (G3) was developed in the middle of the transgressive systems tract.In the basinal area, which was dominated by a lacustrine setting, the thinn er coal (G1) was developed near the transgressive surface.

国家科技重大专项资助项目(2011ZX05033-002)；全国煤炭资源潜力评价专项资助项目(1212011121043)；