【摘要】 根据层序地层学理论,研究他拉哈西地区的层序地层格架及沉积体系特征;根据层序界面岩性-电性及地震反射特征,将泉头组四段到嫩江组三段地层划分为2个二级层序、6个三级层序、17个四级层序;综合利用岩心、测井、地震等资料,确定层序内部沉积特征;根据层序发育特征,确定层序格架内的各时期沉积相平面分布规律.结果表明:研究区主要以三角洲及湖相沉积为主,西部为三角洲平原亚相沉积和三角洲前缘水下分支河道、席状砂和河口坝沉积;东部为滨浅湖、半深湖亚相沉积.砂岩发育层段受四级层序界面的控制,层序与砂组具有良好的对应关系.更多还原

【Abstract】 Based on the theory of sequence stratigraphy,we have carried out a detailed research on the stratigraphic framework and sedimentary system of Talahaxi.According to the seismic profile’s and lithology-electrical materials’ characteristics of the sequence boundary,the intended zone which were member 4 of Quantou formation to member 3 of Nenjiang formation was divided into two second-order sequence,six third-order sequence and seventeen fourth-order sequence.Comprehensively using the core,well logging and seismic materials,we determined the sedimentary characteristics in the sequences.Comprehensively analysis indicated that the facies of the intended zone are mainly delta deposition and lacustrine sediments.According to the characteristics of the sequences,we determined the plane distribution rule of the intended zone.The facies of the western research area are mainly delta plain facies,distributary channel sand,sheet sand and river mouth bars,but mainly littoral and shallow lake,semi-deep lacustrine in the eastern.By the analysis of the characteristics of the system tracts in the sequence,we know that the formation mainly consisting of sandstone in sand group is obviously under the control of the fourth-order sequence boundary,the sequences and the sand groups have good corresponding relationship.更多还原