Based on the core analysis and combined with the analyses of log facies, seismic facies and seismic attribute extraction, fan-delta and shallow and semi-deep lacustrine sedimentations have been identified in Lower Zuunbayan Formation. The development and distribution of sedimentary facies and microfacies have been revealed in the sequence stratigraphy framework with high-accuracy, and the main source direction is the uplift areas in the east and northeast of the slope. Four types of development patterns of the favorable reservoir facies belts in this block have been established: structural-lithologic trap formed by fan-delta front sand bodies in highstand and lowstand system tracts in faulted slope-break zone; truncated unconformity trap formed by fan-delta front sand bodies in highstand system tract under sequence interface; lithologic trap formed by incised valley in lowstand system tract; onlap unconformity trap formed by fan-delta front sand bodies in lowstand system tract. All of theye providea reliable evidence for the exploration and development of this block.%以岩心分析为基础,结合测井相、地震相和地震属性提取分析,在南屯组内识别出扇三角洲沉积、湖泊相浅湖一半深湖沉积.在高精度层序地层格架内揭示了沉积相及微相的发育及分布,物源方向主要为东部、北东部隆起区.建立了该区的4种有利储集相带发育模式:发育断裂坡折带下高位体系域和低位域扇三角洲前缘砂体形成的构造-岩性圈闭;层序界面下的高位域扇三角洲前缘砂体形成削蚀不整合罔闭;低位域下切谷形成的岩性罔闭;低位域扇三角洲前缘砂体形成上超不整合罔闭.为该区勘探开发提供了可靠依据.
展开▼
