Seismic Sedimentological Analysis on Meandering River of Lower Jurassic in Hinterland of Junggar Basin
For exploring the regional distribution of continental reservoirs characterized by deep burial depth,intense compaction,high diagenesis,and tight reservoir pore space,the seismic sedimentology was analyzed in the Lower Jurassic strata in the hinterland of the Junggar Basin utilizing the sequence stratigraphy and the instantaneous phase,root mean square amplitude and frequency decomposition attributes extracted from flattened seismic data volume.Three sequences are identified,including SQ1,SQ2 and SQ3.From SQl to the transgressive systems tract of SQ2,sequences are dominated by fluvial sedimentary,while the highstand systems tract of SQ2 to SQ3 were dominated by deltaic sedimentary.The seismic attribute analysis exhibits consistent results which channels are recognizable and reliable.They are single-channel configurations to oxbow lakes,crevasse splay,and other fluvial microfacies during their migration and evolution.Rivers evolves from low curvature and wide riverbeds to high curvature and narrow riverbeds,before settling into medium-curvature and wide riverbeds.Additionally,there is a gradual shift in flow direction from south-north to northeast-southwest.The results can provide reference and guidance for utilizing seismic data to identify meandering rivers.
seismic sedimentologyseismic attributeflattened seismic data volumemeandering riverhinterland of Junggar Basin
万方数据
维普
