【摘要】 综合应用地震、岩芯、测井和录井资料,在准中地区清水河组层序地层格架内识别出两期低位三角洲砂体。SQ1低位三角洲岩性为含砾砂岩和细砂岩,分选中等,粒度概率曲线包括一跳一悬式和两跳一悬式,发育冲刷充填、磨圆泥砾等沉积构造,沉积相以水下分流河道微相为主体。SQ2低位三角洲岩性为粉砂岩和泥质粉砂岩,分选较好,粒度概率曲线以多跳一悬式为主,发育爬升层理、波状复合层理等沉积构造,沉积相以水下分流河道和前缘席状砂为主。两期低位三角洲砂体储层物性较好,紧邻厚层泥岩,发育有效输导体系,具有十分有利的油气成藏条件。更多还原

【Abstract】 Two low-stand delta sand bodies were recognized within sequence stratigraphic framework of Qingshuihe formation in the middle of Junggar basin according to seismic,well logging and core data. Underwater distributary channel micro-facies is the main part of SQ1 low-stand delta,which consists of moderately sorted pebbly sandstone and fine sandstone with grain size probability curves of one bouncing population-one suspension population pattern as well as two bouncing population-one suspension population pattern and develops socur-fill structure,rounded boulders and some other sedimentary structures. Underwater distributary channel and frontal sheet sand are main micro-facies of SQ2 low-stand delta. The lithology of SQ2 low-stand delta is well sorted siltstone and argillaceous siltstone,of which the grain size probability curves is mainly multi-bouncing population-one suspension population pattern and has sedimentary structures including climbing beddings,corrugated composite beddings and so on. Two sets of low stand delta sand bodies,which are close to thicklayer mudstone with relatively high porosity and permeability,have efficient migration pathway and favored condition of hydrocarbon accumulation.更多还原