Biot-Rayleigh theory Dongsha Waters in the northern South China Sea margin History of engineering & technology Mesozoic hydrocarbon P-wave velocity dispersion and attenuation Research & information: general Technology: general issues XRD Yinggehai airflow reversal amplification effects anelasticity asymmetric failure biomarker cemented coal gangue-fly ash backfill sample compression test concrete lining structure conformance control control measures crack strain creep behavior crushed rocks cyclic steam stimulation deep chamber deformation characteristics directions of incident waves discrete element method dynamic contact force equivalent nodal forces extreme gradient boost (XGBoost) trees