Tectonic evolution and its control on oil–gas accumulation in southern East China Sea since the Jurassic

Based on the results from previous research Mesozoic igneous rocks, as well tectonic environments in northern South China Sea and southern East (NSCS-SECS), geophysical parameters, strata, characteristics of seismic facies NSCS-SECS were investigated. These findings combined with analysis balanced profile evolution to re-evaluate SECS since Jurassic. Furthermore, burial history simulation wells analyzed using well, source rock data. favorable models oil–gas accumulation Lower–Middle Jurassic proposed combination studies elements conditions petroleum system. The demonstrated that had consistent settings comparable strata Cretaceous time. There was a large unified basin this period. experienced two evolutionary stages, respectively, fore-arc depression Early–Middle (J 1-2 ) back-arc faulted Late Jurassic–Cretaceous 3 -K). considerable deposition dark mudstones during Keelung Sag depositional center accumulating thickest section rocks which entered high-maturity stage. Hence, it hydrocarbon generation SECS. process generating hydrocarbons high complexity northwest southeast. at edges while toward southeast three stages. types various phases different due control by evolution. Oil gas generated migrated accumulated western high-tectonic units. Research provide insights into oil exploration NSCS-SECS.