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采用回剥法和局部均衡模式研究万安盆地的构造沉降作用,探讨了该盆地构造演化特征:万安盆地是一个剪切拉张盆地,经历了3次快速沉降.渐新世时期的沉降幅度占总沉降幅度的45%～60%,在盆地中、北部发育了两个沉降中心,βmax为1.84.中新世时期的沉降作用与南海西南次海盆开启有关,盆地发育了3个沉降中心,βmax为1.60.上新世一第四纪时期沉降作用与南海区域沉降有关.该盆地经历了断陷、拗陷、压扭和区域沉降等4个构造演化阶段,盆地北部和中部具有良好的油气远景.
The tectonic subsidence of Wan’an Basin was studied by the back-stripping method and local equilibrium model, and the tectonic evolution of the basin was discussed. The Wan’an basin is a shear-stretch basin experienced three rapid subsidences. The sedimentation rate during the Oligocene Accounting for 45% -60% of the total sedimentation rate. In the middle and northern part of the basin, two subsidence centers are developed with a βmax of 1.84. During the Miocene, the subsidence was related to the opening of the Southwest sub-sea basin in the South China Sea. Three subsidence centers were developed in the basin, βmax is 1.60.The Pliocene-Quaternary sedimentation is related to the subsidence in the South China Sea.The basin underwent four tectonic evolution stages such as fault depression, depression, compression buckling and regional subsidence.The basin possesses good hydrocarbon prospect in the north and middle part .