东海陆架盆地中生界油气调查进展与面临的挑战

OIL AND GAS EXPLORATION IN THE MESOZOIC OF EAST CHINA SEA SHELF BASIN:PROGRESS AND CHALLENGES

东海陆架盆地是我国海域的一个大型中—新生代复合型含油气盆地,中生代盆地是我国海域油气勘探战略接替区之一。2005年之前主要以新生界为目的层,2005年之后,随着地震采集和处理技术的提高以及勘探思路的转变,针对中生界开展了富有成效的调查研究,取得了一系列成果与进展:(1)初步建立了一套深层二维地震采集技术和处理技术;(2)通过海陆对比和地震地层学分析,东海中生界分布广,具有"东海西陆"的古地理格局;(3)中生代盆地具有北东分带结构特征和3期演化;(4)中生界发育2套烃源岩和2套生储盖组合。在此基础上分析了东海陆架中生代盆地油气调查所面临的问题与挑战。

The East China Sea Shelf Basin is a large-scale Cenozoic complex petroliferous basin in Chi- na＇s sea area. The Mesozoic basins there are regarded as the strategic successor for oil and gas explora- tion in China. In the period prior to 2005, the Cenozoic was the major exploration target in the coun- try. After 2005, however, with the improvement of seismic acquisition and processing technology and the change of exploration ideas, a series of progress has been achieved in exploration in the Mesozoic, such as, 1） the rapid development of deep 2D seismic acquisition and processing technology; 2） the distribution pattern of the Mesozoic in East China, i.e. ＂the terrestrial Mesozoic in the west and the marine in the east ＂ was established through stratigraphic correlation between the sea and the land; 3） the NE zonation of the Mesozoic basins is confirmed and the basins have passed through three evolu- tionary stages. 4） Two sets of source rocks are discovered in the Mesozoic. On the above basic facts, the problems and challenges of oil and gas exploration in Mesozoic basins in the East China Sea Shelf Basin are analyzed and discussed.