Block Rotation Effect and Its Significance of Tanlu Fault

In order to explore the starting time of dextral strike slip of the Laizhou Bay segment of the Tanlu fault and its tectonic response, structural sedimentary responses closely related to right strike slip movement are studied in depth based on the latest drilling data and 3D seismic data. It is found that the clamped geological block rotated clockwise passively as soon as the double track strike slip began its dextral strike slip, resulting in differential strain (extension or extrusion) effect. During a regional extensional background, subsiding would be promoted if the extension effect is produced, enlarging the subsidence area of the partial depression and changing the part of the uplift into the depression area, both proved to be hydrocarbon rich depressions. If the extrusion effect is produced, subsiding would be inhibited, resulting in the slowdown, even shrinking, uplifting and eroding of the settlement of some depression areas, and the potential of hydrocarbon generation decreases or even disappears, and convex areas still maintain a state of protruding. The comprehensive information of stratigraphic residuals and regional tectonic environment indicate that tectonic responses to the dextral strike slip of the Tanlu fault (Laizhou Bay segment) simultaneously appeared when the E₂s₃^M was deposited.