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近两年来开展了新一轮大调查 ,根据长排列多道地震资料显示 ,北黄海在印支—燕山运动形成的隆起背景上 ,分布着 4个中、新生代拗陷 ,最大沉积厚度 80 0 0 m,其中晚侏罗—早白垩世沉积厚度 60 0 0 m,是拗陷中主要的生储油层 ,局部构造类型主要为断块、断背斜、潜山及反转背斜等 ,具有形成中小型油气田的潜力。南黄海是下扬子后加里东台地的主体 ,于中部隆起及其两侧 ,广泛分布着厚度大于 50 0 0 m的较稳定的晚古生代—早中生代海相地层 ;中生代以来 ,在中部隆起南侧发育了裂谷型盆地 ,可与苏北盆地对比 ;其北侧 ,则在苏胶造山带与中部隆起之间形成前陆盆地 ,其面积约 4万 km2 ,古生代及中、新生代沉积厚度可达 1 50 0 0 m,具有海相及陆相多层系、多类型的成藏系统 ,局部构造类型多 ,晚期成藏条件好 ,具有形成大中型油气田的潜力。南黄海的“黄北前陆盆地”是本区最有远景的战略勘探区。对中部隆起区 ,应加强研究 ,以期在非构造圈闭油气田方面有新的发现
A new round of investigations has been carried out in the past two years. According to the long array of multi-channel seismic data, the northern Huanghai Sea distributed four Mesozoic and Cenozoic depressions on the uplift background of the Indo-Yanshanian movement with a maximum sediment thickness of 80 ° 0 m. The Late Jurassic-Early Cretaceous sedimentary thickness is 60 000 m, which is the major oil and gas reservoir in the depression. The local tectonic types are mainly fault blocks, faulted anticline, buried hill and anticlocking anticline, The potential of small and medium sized oil and gas fields. The southern Yellow Sea is the main body of the Caledonian platform after the Lower Yangtze. On the central uplift and its two sides, the relatively stable Late Paleozoic-Early Mesozoic marine strata with thicknesses greater than 500 m are widely distributed. Since the Mesozoic, Developed a rift basin that can be compared with the northern Jiangsu basin; the northern side of the foreland basin formed between the Su-rubber orogenic belt and the central uplift, an area of about 40,000 km2, Paleozoic and Mesozoic and Cenozoic sedimentary thickness It has a multi-layered and multi-type reservoir system of marine and terrestrial facies. It has many local tectonic types and has good reservoir forming conditions in the late stage and has the potential to form large and medium-sized oil and gas fields. The “Yellow River Foreland Basin” in the southern Yellow Sea is the most prospective strategic exploration area in the region. In the central uplift, the study should be strengthened with a view to finding new discoveries in non-structural trapped oil and gas fields