【摘要】 蒙古国宗巴音凹陷总体勘探程度及认识程度较低。应用三维地震资料及钻井资料,对宗巴音凹陷三维区下白垩统沉积相特征及分布规律进行了深入研究。结果表明,宗巴音凹陷下白垩统经历了断陷和拗陷2个完整的演化阶段。受区域构造背景影响,研究区查二段、下宗巴音组上段及上宗巴音组主要发育辫状河三角洲沉积,下宗巴音组下段及中段主要发育半深湖—深湖沉积。总体来看,研究区湖盆水体经历了由浅—深—浅的变化过程,相应形成了辫状河三角洲前缘和滨浅湖、半深湖—深湖、辫状河三角洲前缘以及滨浅湖的相序组合,物源主要为西部的宗巴音低凸起。辫状河三角洲前缘亚相为该区有利沉积相带;宗巴音构造及宗巴音东构造为有利的勘探区带。更多还原

【Abstract】 Due to lack of sufficient data previous research mostly studied the petroleum geology character with limited 2D seismic data and logging data, so, the understanding is limited. On the basis of former understanding, and combined the 3D seismic data with core,well logging and logging data of new wells, we deeply studied the sedimentary facies and rules of distribution of down-Cretaceous in Zuunbyan sub-basin 3D work area, the author thought that, in the period of down-Cretaceous deposition, under the control of adjacent structure, the lake basin water body of study area went through shallow to deep to shallow, and relevantly formed phase sequence from stream delta front, shallow to semi-deep and deep lacustrine to delta front. Source of favorable sediments are mainly from west hog of Zuunbyan sub-basin.更多还原