Research on distribution characteristics of sedimentary microfacies of a system tract under a high resolution sequence framework: A case study of Qixia Formation in Gaomo block, central Sichuan

In conventional sequence stratigraphy research, owing to the limitation of resolution seismic data, strata can only be divided into third order sequences at most on profile. this study, vertical fourth is using high resolutions gamma ray (GR), uranium (U), thorium (Th), and potassium (K) curves in logging curves, depth system then accurately superimposed profile through one dimensional forward modelling. Subsequently, three Fourier transform technology, dip angle azimuth information data entire region are scanned obtain horizons. Through progradation retrogradation characteristics sediments Wheeler system, guided by framework, horizontal interpretation tract conducted region. Finally, attribute optimisation, root mean square amplitude attribute, with highest degree coincidence well selected study evolution sedimentary microfacies different periods four tracts. Notably, Qixia Formation area two-fourth sequences, wherein SQ1 comprised transgressive systems 1 (TST1) stand (HST1), SQ2 TST2 HST2. With change relative sea level cycle, developed overlapping interbank depression, sea, intraplatform shoal from bottom top.