北部湾盆地海中凹陷成藏关键要素及成藏模式

Key Factors and Mode of Hydrocarbon Accumulation of Haizhong Sag in Beibu Gulf Basin

海中凹陷经几十年勘探虽点上有发现,但因成藏关键要素不明勘探陷入了停滞。该文为寻求其勘探规模突破方向,在成凹、成烃研究的基础上,深化成藏关键要素研究,建立了海中凹陷成藏模式,指出了规模突破的勘探有利区带。研究认为:海中凹陷油气成藏关键要素是近生烃中心、圈源时空匹配佳、油气输导条件好、优质储层发育。北部陡坡带是各成藏关键要素匹配最佳区,是海中最有利的勘探区带。研究成果为寻求海中凹陷规模油气突破指明了方向。

After decades of exploration,active oil and gas shows have been found in Haizhong Sag,but the exploration has stalled because the key factors of the hydrocarbon accumulation are unknown.In order to seek for the breakthrough direction of exploration,the research on the key factors of hydrocarbon accumulation has been deepened on the basis of the studies of structural and sedimentary characteristics and hydrocarbon generation,and the accumulation mode is established to predict the favorable exploration zones.It is concluded that the key factors of hydrocarbon accumulation in Haizhong Sag are the near hydrocarbon generating center,time and space matching well of trap and source,good oil and gas transport conditions and development of high-quality reservoir.The northern steep slope zone is the best matching area and the most favorable exploration zone in Haizhong Sag.The research results point out the direction for seeking large-scale oil and gas breakthroughs in Haizhong Sag.