莺歌海盆地泥底辟成因、展布特征及其与天然气运聚成藏关系

泥底辟是南海北部边缘西区莺歌海盆地颇具特色的地震地质异常体，具有欠压实异常、高温高压特点及低密低速的地球物理特征，其展布则具有明显分带性且沿盆地北西走向呈近南北向雁行式排列。泥底辟成因及分布，主要受控于盆地快速沉降及高速沉积充填压实与排出流体不均衡所产生的巨大异常高温高压潜能．和区域控盆断裂晚期右旋走滑伸展活动。而晚期泥底辟热流体上侵活动及其他成藏条件的有效配置，则有效地控制了天然气及CO2运聚成藏规律。

Origin and distribution of mud diapirs in the Yinggehai basin and their relation to the migration and accumulation of natural gas

Mud diapirs are characteristic anomalous seismic-geologic bodies in the Yinggehai basin on the northern margin of the South China Sea and have the less compact, abnormally high-pressure and -temperature and low-density and -velocity geophysical characteristics. They show pronounced zoning and are distributed en echelon in a nearly N-S direction along the northwest trend of the basin. The origin and distribution of the mud diapirs were controlled mainly by the combined action of the great abnormally high-temperature and -pressure potential energy produced by rapid subsidence of the basin and inequilibrium between the filling-compaction of rapidly deposited sediments and fluids squeezed out and the dextral strike-slip extension of regional basin- controlling faults in the late stage. The natural gas and CO2 migration and accumulation were effectively controlled by the effective combination of the upward intrusion of the late-stage mud-diapir thermal fluids and their accumulation conditions.