南黄海盆地26口钻井特征

CHARACTERISTICS OF THE 26 WELLS FROM THE SOUTH YELLOW SEA BASIN

总结了南黄海盆地54年来油气探井钻探成败的经验,图示了井震圈闭的特征,指出迄今南黄海盆地完钻26口井,其中中国21口,总进尺54 502 m;124°E以西平均8 047km2钻井1口。钻井揭露地层包括石炭系、二叠系、三叠系、侏罗系、白垩系、古近系、新近系与第四系,最老地层为石炭系;钻遇岩性有碳酸盐岩、煤系和碎屑岩;揭露了16种地层接触关系,解剖了背斜、断块、透镜体岩性和不整合面等圈闭类型。中方21口井主要分布于南黄海盆地南部坳陷、北部坳陷和勿南沙隆起3个区带,先后在CZ6-1-1井获得轻质原油2.45t、在ZC1-2-1井泥岩岩心裂缝中见轻质油以及在其他3口井中见油气显示。最后提出了古生界参数井钻探等建议。

There are a total of 26 drilling wells in the South Yellow Sea Basin, of which 21 with a total footage of 54 502 m are drilled by China. To the west of 124°E, there is one well per 8 047 km^2 on average. The Carboniferous is the oldest sedimentary strata encountered so far in the region. There occur the Permian, Triassic, Jurassic, Cretaceous, Paleogene, Neogene and Quaternary deposits. Carbonate, clastic rocks and coals are all available. There are 16 kinds of stratigraphic contacts and various traps, such as dissected anticlines, fault block, lens and traps sealed by lithology and unconformities. The 21 Chinese wells are located in the three districts, they are the Southern Depression, the Northern Depression and the Wunansha Uplift of the South Yellow Sea Basin. In the well of CZ6-1-1 there gained 2.45 tons of light oil and in the well of ZC1-2-1 light crude oil is found in shale fractures. Oil and gas shows are observed in other three wells. Based on the data mentioned above, we put forward some suggestions about drilling Paleozoic parameter wells.