Fuling area History of engineering & technology InSAR monitoring N2 adsorption experiment South China Sea Technology: general issues Yinggehai Basin acrylic acid brittle index carbon capture and storage carbonate cavern reservoir application chitosan coal coal gangue coal measure coalbed methane (CBM) complex fracture net diagenetic process estimated ultimate recovery feasibility assessment model formation of bedding fractures free methane gas reservoirs gas-bearing property gel–foam grey correlation method low-field NMR main control factor model