High resolution sequence stratigraphy analysis in Tengge'er Formation from well logging data

According to the dynamic changes of accommodation space (A) and sedimentary supply (S) ratio reflected in well logging response characteristics, combined with sedimentary characteristics, sedimentary facies and cyclic symmetry changes data and well logging stacking patterns, the different base levels cycle of well logging response characteristics and sedimentary volume distribution within system tract have been determined in the guidance of the high resolution sequence stratigraphy theories.Short-term base lever cycle have been divided into 3 types including up-deepening asymmetrical type (A), up-shallowing asymmetrical type (B) and up-deepening asymmetrical into up-shallowing symmetry (C).According to the low and high accommodation characteristics, type-(A) is divided into A1 and A2, the type-B is divided into B1 and B2.Based on the symmetry of ascending base lever cycles and descending base lever cycle, type-C is divided into complete- nearly complete symmetric (C1), incomplete-symmetry of mainly ascending base lever cycles (C2) and incomplete-symmetry of mainly descending base lever cycles (C3).Besides, there are 7 short-term types of base-level cycles.