【摘要】 根据钻井、测井、地震、分析化验等资料综合分析,辽河盆地新开—董家岗斜坡带古近系沙河街组三段为一个完整的三级Ⅰ类层序。其低位域以发育厚层状紫红、灰白色砂砾岩夹泥岩组成的冲积扇相占优势,水进域以形成深灰色、褐灰色泥岩夹砂质泥岩组成的湖相沉积为典型特征,高位域过渡为浅色砂岩、砂砾岩及暗色泥岩不等厚互层组成的扇三角洲相。对应的层序沉积相演化表现为低位冲积扇→水进湖泊→高位靠扇型扇三角洲,建立了相应的层序沉积相演化模式。指出有利于储层发育的砂体主要为低位域冲积扇相和高位域扇三角洲相,而水进湖泊相则是有利烃源岩相带。更多还原

【Abstract】 According to the synthetical analysis of drilling,well logging,seismic and test data,it is recognized the third Member of Shahejie Formation is a Ⅰ-type sequence of the third order in the slope zone from Xinkai to Dongjiagang in the Liaohe Basin.LST is dominated by alluvial fan facies which are composed of mauve and hoar heavy bedded conglomerate mingling mudstone.TST is typically characterized by lake facies which are composed of deep-grey and brown-grey mudstones interlayering sandy mudstones,to HST the facies are switched to fan-delta ones which are composed of interbedded light-colored sandstone,conglomerate and dark-colored mudstone.The evolution of sequence depositional facies corresponded above is LST alluvial fan→TST lake→HST fan-delta adjacent to alluvial fan.It is pointed out that LST alluvial fan and HST fan-delta facies are favorable for the formation of reservoir sandbodies,and TST lake facies are favorable for development of source rock.更多还原