博兴洼陷西部沙河街组三段层序地层分析与岩性圈闭预测

以高分辨率层序地层学理论为基础，建立博兴洼陷西部沙河街组三段层序格架，根据井-震标定识别出大规模层序界面和洪泛面等9个具有时间意义的界面，将沙河街组三段划分为4个中期基准面旋回和8个短期基准面旋回。对博兴洼陷西部物源体系分析后，厘定南部鲁西隆起主物源，具有辫状三角洲特征，三角洲前缘滑塌作用在前方洼陷内形成规模较大浊积扇体；建立层序地层发育模式，认为与三角洲有关的浊积扇体主要发育在基准面的上升期，且浊积扇体发育规模与洪泛作用呈正相关。指出古地形坡折带对岩性圈闭砂体发育的控制作用，岩性油藏发育具有自南向北类型减少，层位变浅的特征，并在不同坡折带预测岩性圈闭20余个。

THE SEQUENCE STATIGRAPHY ANALYSIS AND LITHOLOGICAL TRAP PREDICTION OF Es3 IN THE WEST OF BOXING SUBSAG

Based on the theory of high-resolution sequence stratigraphy, the stratigraphic framework of Es_3 in the west of Boxing subsag has been established. Using the information of log, core and seismic data, 9 large scale surfaces with time-significance including sequence boundary and flooding surface have been recognized and middle term base levels and 8 short ones have been classified in Es_3. This paper has discussed sedimentary source in the west of Boxing subsag in details.The main source region is from Luxi uplift, which has the feature of braid-delta.Owing to the slip of the delta front, many turbidite fans have been formed.Accordingly,the upgrowth model of sequence stratigraphy has been established.The turbidite fans which have relation with delta have mainly formed in the rising period of the base level, and its scale is proportional to flooding surface. The distribution of sand in lithological trap is controlled by the slop-break zone of the palaeotopography. From south to north in this area, the types of lithologic deposit decrease and the position changes to shallow layers.More than 20 lithological traps in different slop-break zone have been predicted.