莺歌海盆地几个地质问题的探讨

Prediction of Forming,Evolution and Type of Reservoir of Yinggehai Basin

莺歌海盆地的重力高可能为古地块的反映 ,古地块可能是从冈瓦纳古陆裂离出来的碎块。莺歌海盆地第三纪形成的断 (陷 )坳 (陷 )结构与印度板块俯冲、碰撞印支板块有关 ,故莺歌海盆地的成生与发育应属特提斯构造域 ,其演化大体上经历了断陷期 (初陷、深陷、萎缩亚期 )、断坳过渡期、坳陷期 (Ⅰ、Ⅱ、Ⅲ次坳期 )和成盆期四个发育阶段。

The high gravity appeared in Yinggehai basin results from existing of paleomass i ves,which are the broken massives split from the Gangwanang ancient land.The for ming of fault depression in the Tertiary in the basin relats to collision and th rust of Indian plate to Indo China plate.The forming and development of Yinggeh ai basin belongs to the Tethys tectonic domain,in which the evolution basically include four developing phases,that is,fault depression(preliminary depression ,deep depression and shrinked subphase),depressed transitional phase,depression phase(Ⅰ，Ⅱ，Ⅲ and secondary depression phase)and the forming of the basin phase.