松辽盆地梨树断陷登娄库组边界类型与沉积体系展布

Boundary types and sedimentary distribution of Denglouku Formation of Lishu fault depression, Songliao Basin

利用二维与三维地震资料,结合盆地构造演化史,研究了梨树断陷登娄库组边界类型与范围。结果表明,断陷北缘与南缘为剥蚀边界,东缘与西缘为资料边界。在沉积学原理指导下的钻测井资料分析表明,梨树断陷登娄库组沉积期发育辫状河三角洲与湖泊沉积,可进一步划分为3类亚相与7类微相,并主要受北部与东北部物源控制。登娄库组下部沉积期,断裂活动减弱,辫状河三角洲沉积进积到断陷南部与桑树台次洼区;登娄库组上部沉积期继承了下部的沉积格局,但进入坳陷期后,古地貌变缓,前缘亚相扩大。

Through the utilization of 2D and 3D seismic data and characteristics of tectonic evaluation, the boundary types of Denglouku Formation of Lishu fault depression were studied. The north and south parts are erosion boundaries, and east and west parts are data boundaries. Under the guidance of sedimentology, the analysis of drilling and logging data shows that braided river delta and lacustrine deposits were developed in Denglouku Formation, Lishu fault depression, three subfacies and seven microfacies can be subdivided, which were controlled by the north and north-east provenances. During the lower part deposition of Denglouku Formation, the fault activity became weak, and the braided river delta moved forward to the south region and Sangshutai Sag. When it came to the upper part of Denglouku Formation, the depositional pattern was inherited. But the basin area expanded and the ancient landform became gentle due to the Lishu fault depression into depression period, which led to the extension of delta front facies.