摘要
采用高分辨率层序地层学理论与基准面旋回识别技术,根据区域构造旋回变化和海平面变化特征,将上二叠统—下三叠统作为1个长期基准面旋回。基于南黄海盆地钻井资料,以岩电组合旋回性特征及特殊岩性(煤层、白云岩、砂岩)为依据,将长期基准面旋回划分为5个中期基准面旋回(MC1—MC5)。连井对比分析表明,上二叠统—下三叠统主要发育三角洲相、潮坪相、台地相和陆棚相,水体西北深、东南浅。依据基准面旋回变化和沉积环境变迁,上二叠统—下三叠统发育两种基准面旋回充填模式,即上二叠统龙潭组相对稳定的潮坪相和上二叠统大隆组—下三叠统青龙组快速海侵陆棚相至稳定的台地相,这些模式可为南黄海盆地中古生界油气地质评价提供基础依据。
The Upper Permian-Lower Triassic (P2-T1) sequence can be classified into one whole long-term base-level cycle(LC1) by using the high-resolution sequence stratigraphy and the base-level cycle recognition technology, and re-ferring to the regional tectonic cycles and sea level changes in Lower Yangtze area. Based on the drilling data in the South Yellow Sea, five medium-term base-level cycles (MC1 to MC5) are recognized in LC1. The analysis of well-linking correlation has shown that delta, tidal flat and shelf facies commonly develop in P2-T1 strata, and sedimentary waters is deeper in the northwest than in the southeast. In the light of integrated analysis of changing base-level cycles and sedimentary environments, two filling patterns of base-level cycles can be recognized in the Upper Permian-Lower Triassic sequence, one is the stable Upper Permian Longtan tidal flat facies and the other is the rapidly-transgressive Upper Permian Dalong shelf facies to stable Lower Triassic Qinglong platform facies. These patterns will be significant to petroleum geology evaluation to Mesozoic and Palaeozoic marine sediments in the South Yellow Sea Basin.
出处
《海相油气地质》
CSCD
北大核心
2015年第3期10-16,共7页
Marine Origin Petroleum Geology
基金
全国油气资源战略选区调查与评价国家专项"南黄海前第三系油气前景研究"(编号:XQ-2005-01)
国家油气资源调查专项"海域油气资源普查"(编号:GZH200800503)等资助
