OIL AND GAS EXPLORATION IN THE MESOZOIC OF EAST CHINA SEA SHELF BASIN: PROGRESS AND CHALLENGES
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摘要:
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。
Abstract:The East China Sea Shelf Basin is a large-scale Cenozoic complex petroliferous basin in China's sea area. The Mesozoic basins there are regarded as the strategic successor for oil and gas exploration in China. In the period prior to 2005, the Cenozoic was the major exploration target in the country. 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 evolutionary 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.
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Key words:
- oil and gas exploration /
- progress /
- challenge /
- Mesozoic /
- East China Sea Shelf Basin
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表 1 东海陆架针对中生界地震采集参数
Table 1. Seismic acquisition parameters for the Mesozoic in the East China Sea Shelf Basin
参数名称 参数值 道间距/m 12.5 炮间距/m 37.5 震源容量/in3 6 060 电缆工作段总长/m 8 100 道数/道 648 覆盖次数/次 108 采样率/ms 2 记录长度/ s 12 最小偏移距/m ＜250 震源沉放深度/m 10 电缆沉放深度/m 16 记录格式 SEG-D，8058 滤波档位 低截止3 Hz/陡度12 dB/oct，
高截止206 Hz/陡度276 dB/oct
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表 2 东海陆架盆地与邻近陆域中生代地层对比
Table 2. Correlation of Mesozoic in the East China Sea Shelf Basin and adjacent land areas
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