松辽盆地北部太平川南区块扶余油层沉积微相研究?

Sedimentary Microfacies of Fuyu Reservoir in the Southern Taipingchuan Area of Songliao Basin

以精细岩心观察描述为基础，通过泥岩颜色、沉积构造、测井曲线特征分析，对松辽盆地北部太平川南区块扶余油层沉积微相进行了研究。松辽盆地北部太平川南区块扶余油层以泥岩、粉砂质泥岩和粉砂岩沉积为主，夹少量细砂岩沉积；研究区扶余油层为-套浅水三角洲相沉积，主要发育三角洲平原和三角洲前缘2种沉积亚相，其中以（水下）分支河道占主体，分支河道表现出弯曲度较大，河道开叉、合并现象明显，摆动频繁，同时河道易发生决口，形成决口扇沉积；从03S01～Q4-SQ3沉积时期，沉积水体先逐渐变浅，在Q3-SQ4时期达到最浅，并在Q4-SQ3时期水体开始由浅变深，表现出沉积微相的纵向连续变化；该研究区砂体发育主体为（水下）分支河道和决口扇，分支河道砂体分布广，储层物性较好，生油潜力大，具有较大的勘探价值。

Based on elaborate core observation,the main lithology including mudstone,silty mudstone,siltstone and pack sand is recognized.According to the analysis of the color of mudsthone, sedimentary structure and logging data,the results show that well-developed shallow delta of Fuyu reservoir can be further divided into two subfacies,delta plain and delta front,branch channels and sub-water channels which frequently present high curvature,channel crossing and flood fan are their main forming units,from Q3-sq1~Q4-sq3,sedimentary water becomes shallow gradually,which is obvious during the period of Q3-sq4,from Q4-sq3~Q4-sq1,the sedimentary water is getting deeper, which can be shown by continuously variational sedimentary facies;and widespreaded sandtone of channels and flood fan with favorable reservoir physical property are worth for further exploration.