塔里木盆地英买力地区白垩系舒善河组相对湖平面变化

塔里木盆地英买力地区下白垩统舒善河组是岩性油气藏勘探的有利层位。然而，该区发育的浅水三角洲与滩坝沉积常相互交织叠加、难以区分，相对湖平面变化研究有助于确定该区沉积相类型及揭示其分布规律。依据高分辨率层序地层学理论，利用岩心、录井、测井等资料，通过结合定性层序划分与定量测井小波变换分析，对塔北隆起英买力地区白垩系舒善河组进行层序地层划分，定量划分出4个长期、8个中期、13个短期及84个超短期层序。基于超短期旋回的Fischer图解分析表明，舒善河组相对湖平面整体上为一次大规模湖侵到湖退，且在沉积中期湖平面缓慢上升至最大规模。舒善河组内部划分的4个长期旋回的湖平面分别对应一次完整的湖侵到湖退的变化过程。通过与前人的研究成果对比可以看出，取得的相对湖平面升降曲线与前人成果的整体趋势较吻合，其内部更精细的多次小规模湖平面变化可作为该区后续地质研究的理论基础。

A research on relative lacustrine level changes of Cretaceous Shushanhe Formation in the Yingmaili area of Tarim Basin

Lower Cretaceous Shushanhe Formation in the Yingmaili area of Tarim Basin is a favorable exploration formation for lithologic hydrocarbon reservoir. However, the shallow water deltas and beach bars deposits in this area were superimposed, so it is difficult to distinguish them. The quantitative analysis of relative lacustrine level changes is helpful to determine sedimentary facies type and reveal their distribution rules. According to the sequence stratigraphy theory, the sequence division of Cretaceous Shushanhe Formation in Yingmaili area of Tabei Uplift was done by using the data of core, drilling and logging, combined with qualitative sequence division and quantitative logging wavelet transform analysis. This formation can be quantitatively divided into 4 long-term sequence cycles, 8 middle-term sequence cycles, 13 short-term sequence cycles and 84 super short-term sequence cycles. The Fischer plots with 84 super short-term sequence cycles indicate the law that the relative lacustrine level changes were integrally from a long time lacustrine transgressive to a long time lacustrine regression and rose the largest during the middle deposition period of Shushanhe Formation. The four long-term cycles of Shushanhe Formation have undergone a complete lacustrine transgressive and lacustrine regression. Compared with previous results, we find that relative lacustrine curve on overall trend in this research was quite in accordance with previous results. Several subtle small-scale relative lacustrine level changes of Shushanhe Formation can be used as a theoretical basis for follow-up geological research in this area.