【摘要】 为鄂尔多斯盆地榆林气田山西组第二段(山二段)气藏得到高效的开发,作者通过钻井岩心、测井、地震及分析测试资料,结合前人研究成果,确定榆林气田山二段属于海相辫状河三角洲沉积体系,气田处在三角洲平原-前缘亚相带,可识别出水上和水下分流河道、天然堤、决口扇、分流间湾或分流间沼泽及洪泛平原等微相;在沉积微相分析基础上,通过辫状河三角洲沉积模式和岩相古地理编图,揭示了鄂尔多斯榆林气田山二段的砂体展布。结果表明榆林气田山二段的水上和水下分流河道砂体最有利于储层发育。更多还原

【Abstract】 According to the comprehensive studies of well loggings,cores,seismic information and previous researches,the authors conclude that Member 2 of Lower Permian Shanxi Formation belongs to the marine facies braided-river delta system.The research area belongs to river delta plain-front subfacies belt.These micro-facies,including distributary channel,underwater distributary channel,crevasse splay,natural levee,interdistributary bay or interdistributary swamp and flood plain,can be identified in this belt.The typical braided river delta sedimentary model of Member 2 of Shanxi Formation in the Yulin gas field and the lithofacies paleogeographic map reveal the sandbody distribution of Member 2 Shanxi Formation in the Yulin gas field of Ordos Basin.The conclusion shows that the water and underwater distributary channel sandbodies of Member 2 of Shanxi Formation in the Yulin gas field are most favorable for the development of reservoirs.更多还原