Depositional response and filling process of the steep slope rift belt in the terrestrial fault basin: a case study of Paleogene in Dongying terrestrial fault basin

Abstract：Syndepositional rift obviously controls the deposition-filling process of the steep slope rift belt in the terrestrial fault basin. Two key rifts, i.e., Chenlan and Shengbei, are developed along the steep slope rift belt in Dongying terrestrial fault basin. The Chenlan rift controls the basin evolution, whereas the Shengbei rift controls the deposition. Clastic components in the steep slope rift belt chiefly came from Chenjiazhuang bulge, Binxian bulge and Qingtuozi bulge. Controlled by the tectonic setting and provenance, alluvial fan, fan-delta, nearshore subaqueous fan, delta and fluxoturbidite-fan were filled in the steep slope rift belt. There exists a typical temporal and spatial evolution in order of alluvial fan→nearshore subaqueous fan→fan-delta→fluxoturbidite-fan→lake. Having good physical properties and strong tectonic activities and being close to oil sources, the steep slope rift belt constitutes a favorable oil and gas accumulation place.