关键词: 辽河盆地, 西部凹陷, 于楼油层, 单砂体, 单层, 短期基准面旋回, 高分辨率层序地层学, 储层非均质性

Abstract:  In order to solve the problems of fault system development, formation fragmentation, rapid spatial variation of thickness, and difficulty in fine stratigraphic division and correlation in a certain area of western depression of Liaohe basin, the corresponding relationship between different stratigraphic fine divisions and correlation methods, such as traditional stratigraphic division and correlation methods. Vail classical sequence stratigraphy and high-resolution sequence stratigraphy, was determined first. On the basis of clarifying the sedimentary genetic model, the key wells are optimized, the stratigraphic subdivision scheme is determined, and the geological and geophysical information is fully excavated. The high-precision isochronous stratigraphic framework of single-layer level in the target layer of the study area is established by using the information of strong reflection of seismic event, lithology change of coring wells, sedimentary cycle, conductivity curve, resistivity curve value change, and fine secondary interpretation results of logging. The correctness of stratigraphic subdivision results is verified by using different single-layer top surface structure maps. The results show that the Yulou Oil-bearing sets in the study area can be divided into 29 short-term base level cycles (single layers), which correspond to the high resolution sequence stratigraphy and medium-term base level cycle(geological age 0.01 Ma). The band developed formation is generally in the direction of NE-SW, and the local highs are in a dome shape, mainly affected by sedimentation and differential compaction.

Key words:  , Liaohe basin, western depression, Yulou Oil-bearing sets, single sand body, single layer, short-term base level cycle, high resolution sequence stratigraphy, reservoir heterogeneity