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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。
The overall exploration level and awareness of the Zongbaon sag in Mongolia are relatively low. Using the 3D seismic data and drilling data, the characteristics and distribution of sedimentary facies in the Lower Cretaceous in Zhaba sound depression are studied in depth. The results show that the Lower Cretaceous Zongba sound depression experienced two complete evolution stages of faults and depression. Affected by the regional tectonic setting, the Upper Member of the Upper Zongba Formation and the Upper Zongba Formation in the study area are predominantly braided deltaic sediments. The lower and middle Zongba Formation are mainly semi-deep lake and deep lake sediments. Generally speaking, the lake basin water body experienced a shallow-deep-shallow change process, and the braided river delta front and foreshore shallow lake, semi-deep lake-deep lake, braided delta front and shallow foreshore Phase sequence combination of the lake, the main source for the western Zongba sound low bulge. The braided river delta front facies facies is the favorable sedimentary facies belt in this area; the Zongba sound structure and the Zongba sound east structure are favorable prospecting zones.