松辽盆地扶余油田白垩系泉四段沉积微相研究

以岩芯和测井分析为基础,通过对吉林扶余油田白垩系泉四段的沉积背景、物源方向、沉积特征、沉积构造的研究,确定其为一套浅水三角洲沉积。区内以浅水三角洲前缘亚相沉积为主体,主要包括水下分流河道、水下分流河道间、水下天然堤和水下决口扇、砂质浅滩等5种沉积微相类型。此外,以单井微相分析为基础,结合大量的地球物理测井及录井资料,研究了区块内白垩系泉四段4个油层组、13个小层的沉积微相平面分布规律。研究结果表明：工区位于三角洲前缘的前部，缺乏前人研究认为的河口坝微相。其中，水下分流河道多呈NNE向和SN向带状展布，由于主河道的摆动，河道中心左右迁移，造成平面上河道砂体分布的不稳定，水下分流河道在第5、6、8、10小层发育。沉积微相的精细研究为油田的下一步开发以及主力层剩余油挖潜奠定了基础。

Sedimentary Microfacies of the Q4 Member of Cretaceous in Fuyu Oilfield，Songliao Basin

Based on core and logging data analysis, Q4 member of Cretaceous in Fuyu Oilfield, Jilin province is recognized to be a set of shallow water delta deposition according to its depositional setting, material sources orientation, sedimentary characteristics and sedimentary structure. With a deposition of shallow water delta front as its main body, it is mainly composed of five sedimentary microfacies, such as underwater distributary channel, underwater interdistributary area, underwater natural levee, underwater crevasse splay and arenaceous shallows. In addition, the planar distribution law of sedimentary microfaices including 4 oil layer groups and 13 layers of Q4 member of Cretaceous are studied on the basis of microfacies analysis of individual well from integration with large quantities of geophysical logging and log data. The results show that this study area is located at the front of the delta front while in lack of mouth bar that was existing in previous literatures. And most underwater distributary channel, developing in the 5, 6, 8 and 10 layers, distribute in the direction of NNE and SN in bands. The shifting of channel center in terms of the main channel shifting has resulted in unsteady distribution of channel sand bodies in plane. The detailed research of microfacies has guided a direction for potential tapping of remaining oil in main productive layers and future development.