Quantitative research of coupling relationship between boundary fault activity and sedimentary evolution in Dongying Depression

Key words:  fault activity  sedimentary evolution  coupling relationship  Dongying Depression

Abstract:

Based on the analysis of the combination patterns and evolution characteristics, the boundary fault activity in Dongying Depression was studied quantitatively using a new method. The relationship between the boundary fault activity and the depositing process was analyzed at the micro to the macro level, and the depositional models template based on fault activity was built. Results show that the activity of boundary fault in Dongying Depression has "weak-alternating strength-strong" characteristics from west to east. At the microscopic level, boundary fault activity controls the four types of sedimentary environment:"stable-rich source", "unstable-rich source", "stable-poor source", and "unstable-poor source". At the macro level, the boundary fault activity has a positive correlation with the sedimentary thickness and negative correlation with forward distance. Combining both microcosm and macrocosm, the depositional models template was built based on boundary fault activity, and the coupling relationship between boundary fault activity and steep slope sedimentary evolution has been defined quantitatively.