准噶尔盆地车排子地区下白垩统沉积体系分布及油气成藏模式

准噶尔盆地车排子地区自排2井区发现春光油田后，未能取得更大的勘探突破，该区存在斜坡带薄层砂体识别困难以及油气成藏主控因素及成藏模式不清等问题。通过高精度层序地层学、地震沉积学和石油地质的综合研究，明确了研究区白垩系的沉积相类型，包括扇三角洲前缘水下分流河道和水下分流河道间微相以及滨浅湖坝砂、滩砂和湖泥微相。有利的储集砂体、阶梯式输导体系和保存封堵条件是车排子地区下白垩统油气藏的主控因素。由于保存条件的不同，工区不同层位、不同位置发育的油气藏，其油品具有显著的差异。进而建立了斜坡带下部、中部和上部3种不同的成藏模式，最终指出斜坡带下部的SQq _1-SQq_2是油气勘探的有利区带和有利层位。研究结果为下一步勘探指明了方向。

Sedimentary System and Reservoir Models of the Lower Cretaceous in Chepaizi Area,Junggar Basin

There aren’t any other exploration breakthroughs after the discovery of the Chunguang Oilfield in well Pai 2 area, Junggar Basin. Some problems need be solved, such as that thin sandbodies is difficult to be depicted and that the main factors and models of reservoirs are not clear, and so on. In this study, through the comprehensive study of high resolution sequence stratigraphy, seismic sedimentary and petroleum geology, the sedimentary microfacies of the study area are indentified as subaqueous distributary channels, interdistributary channels of fan delta, bar and beach of shallow lacustrine. The main factors which control the reservoirs in Lower Cretaceous are the favorable sandbody, translocating system and preservation condition. Due to the different preservation conditions, the oil quality is different in different places and different intervals, so there are three reservoir models in the lower, middle and upper of the slope zone. The favorable zones and intervals is SQq _1 to SQq_2 in the lower of the slope zone.