【摘要】 塔河油田下石炭统巴楚组底部砂泥岩段岩性复杂,沉积相类型及分布规律不清楚。利用岩心观察、连井剖面对比、薄片分析、地震属性分析等方法,对巴楚组底部砂泥岩段沉积特征进行系统研究。结果表明:巴楚组底部砂泥岩段主要为冲积扇、潟湖、障壁型滨岸相沉积。冲积扇沉积发育于工区北部S85井附近,为北东-南西向展布的朵状体,岩性以大套细-中砾岩为主,物性差,不具储集能力;潟湖沉积分布于工区南部古鼻凸西南轴部,岩性主要为钙质泥岩、泥灰岩;障壁岛沉积位于工区南缘,沿北东东向平行于阿克库勒古鼻隆轴线分布;滨岸沉积位于工区西南部,主要发育临滨亚相,以细砂岩沉积为主。障壁沙坝和滨岸临滨砂岩的储集能力良好。更多还原

【Abstract】 The sedimentary facies and distribution of the sand-mudstone member are ambiguous due to complex lithology in the bottom of Bachu Formation,Lower Carboniferous in Tahe Oilfield.Based on detailed description and observation of drilling cores,integrated with logs,casting thin-sections and seismic attributes analysis,the sedimentary systems consisting of alluvial fan,lagoon,barrier-type coastal are identified in the study area.Flower-like sand bodies of alluvial fan as non-reservoir developed along NE-SW direction in northern study area next to well S85,with a large set of conglomerate.Lagoon deposits distributed in axis of Akekule ancient uplift in southern study area,are made up of calcareous mudstone and marlite.Barrier island in southern study area distributes along the NEE direction,and parallels to the axis of the uplift.Fine sandstone of coastal shore facies deposited in the southwest part of working area.Sandstones of the barrier bar and shore facies are both favorable reservoirs.更多还原