Application of continuous electromagnetic profiling method to the exploration of a rift depression in Maigaiti slope,Tarim Basin
With deepening understanding of the deep oil and gas exploration in the Tarim Basin,the Sinian-Nanhua rift trough plays a crucial role in controlling the development and preservation of source rocks.Hence,detecting the rift trough in this area is a pivotal exploration direction for oil and gas.Previous studies have suggested the existence of the Sinian-Nanhua rift trough in the southwestern Tarim area,particularly on the Maigaiti slope.However,due to the limited quality of seismic data in this region,our understanding of deep structures,especially the basement and the distribution and extent of the rift trough,remains limited.By implementing CEMP(Continuous Electromagnetic Profiling)section through the Maigaiti slope and the Yecheng depression in the southwestern depression,and correlating geological conditions with well data,we constructed a layered resistivity structure model.From the two-dimensional inversion of actual data,we derived both the deep electrical structure and comprehesive geological interpreation of the area.We provided new electromagnetic evidence for assessing the development of the Neoproterozoic rift trough in this region,and further delineated the electrical characteristics and structures of both the basement and rift trough,and our analysis suggested that the trough was predominantly controlled by normal faults,showcasing a pattern of half grabens,asymmetrical grabens,and alternating graben-horst structures.Two sets of rift troughs,evident in the central and southern parts of the Maigaiti slope and Yecheng depression,enhance the deposition of source rocks in the area.In regions where the Sinian-Nanhua strata are more prominent,there exists enhanced deep oil and gas exploration potential.
Maigaiti slopeCEMPSinian-Nanhuarift troughsource rock
万方数据
维普
