布木格油田SⅢ油层组沉积微相研究

Research on sedimentary microfacies of SⅢoil layer group in Bumuge Oilfield

针对布木格油田SⅢ组沉积微相类型不清楚、沉积环境模糊的问题,在层序地层学和沉积岩石学的理论指导下的方法采用了封闭骨架剖面控制对比的方法,在研究区内选择顺直物源方向的2条横贯全区的主干纵剖面和垂直物源方向的2条横贯全区的主干横剖面,构成区域骨架封闭剖面网的基础下进行了全区对比。根据研究区沉积环境等建立了8种测井相模式,绘制了SⅢ油层组11个小层的沉积相图,对最发育的小层沉积微相平面展布规律进行了研究。结果表明,SⅢ油层组发育三角洲前缘亚相和深湖半深湖亚相,水下分流河道、主体席状砂、一类席状砂、二类席状砂、深湖半深湖等微相。总结布木格油田SⅢ油层组沉积微相类型,为后期的研究提供了有力的地质依据。

In view of the unclear types of sedimentary microfacies and the fuzzy sedimentary environment of the SⅢgroup of Bumuge Oilfield,the method under the guidance of the theory of sequence stratigraphy and sedimentary petrology adopts the method of closed skeleton profile control and comparison.Two main longitudinal sections traversing the entire region in the direction of the straight provenance and two main cross sections traversing the entire region in the direction of the vertical provenance were selected to form a regional skeleton closed profile network based on the comparison of the entire region.According to the sedimentary environment of the study area,8 types of logging facies models have been established,the sedimentary facies diagrams of 11 sublayers of the SⅢoil layer group have been drawn,and the plane distribution law of the most developed sublayer sedimentary microfacies has been studied in detail.The results show that the SⅢoil layer group developed delta front subfacies and deep lake and semi-deep lake subfacies,underwater distributary channels,main sheet sand,first type sheet sand,second type sheet sand,deep lake and semi-deep lake,etc.Mutually.It is of great significance to summarize the types of sedimentary microfacies of the SⅢoil layer group in Bumuge Oilfield,which provides a strong geological basis for later research.