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南海西南海区是近年来我局新开辟的地球物理调查区,该区水深较浅,沉积巨厚,已发现多个油气田,油气远景喜人。由于缺乏钻井资料验证,地震层序的地质年代尚有不同意见。本文从区域地质资料分析、国内外地震调查解释及少量钻井层位对比三个方面进行了综合分析,认为T_2反射界面相当于上新统和中新统分界,T_3反射波相当于上中新统和中中新统间界面,T_4反射波相当于中新统和渐新统间界面,T_5反射波相当上渐新统或渐新统底部界面,局部地区可能为中生界顶面。
Southwest China Sea is a newly opened geophysical survey area of our bureau in recent years. The area is shallow in water depth and has a large deposition. A number of oil and gas fields have been discovered, and the prospect of oil and gas is gratifying. Due to the lack of verification of drilling data, the geological age of seismic sequences still has different opinions. In this paper, a comprehensive analysis is made on three aspects of regional geological data analysis, interpretation of seismic surveys at home and abroad, and comparison of a small amount of drilling beds. It is believed that the T 2 reflection interface is equivalent to the boundary of the Pliocene and Miocene, and the T 3 reflection wave is equivalent to the Upper Miocene The T_4 reflected wave is equivalent to the interface between the Miocene and Oligocene. The T_5 reflected wave is similar to the Oligocene or Oligocene bottom interface, and the local area may be the top of Mesozoic.