Geological characteristics of the Meso-Paleozoic in South Yellow Sea Basin and future exploration
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摘要: 南黄海广泛发育海相中、古生界，资源量丰富，勘探潜力大，但一直未取得勘探突破。通过与上扬子四川盆地类比，最大的差异在于后期构造改造的强度不同。南黄海盆地遭受多期次强烈的后期改造，致使早期生成的油气被破坏和改造，不利于油气保存，在南黄海区内寻找构造相对稳定的区带，是南黄海盆地中、古生界取得油气突破的关键；综合南黄海残留地层分布、石油地质条件、构造变形特征等的研究结果，对南黄海中、古生界最具现实勘探意义的区域进行了优选，认为崂山隆起中南部弱变形区是南黄海中、古生界实现勘探突破最有利区带，下古生界是下一步重点的勘探层系。Abstract: The South Yellow Sea Basin is a large Mesozoic-Paleozoic petroliferous basin with substantial hydrocarbon potential. However, there has had no breakthrough so far in oil exploration in the basin. Comparison suggests that the biggest difference between the South Yellow Sea Basin and the Sichun Basin is mainly caused by tectonic intensity. It is known that the South Yellow Sea Basin has suffered from multi stages of tectonic movement in the periods of Mesozoic and Palaeozoic and the preservation conditions are damaged to certain extent. Breakthrough in oil and gas exploration is expected in some tectonically stable zones. Based on the above observation, this paper is devoted to the tectonic- sedimentary evolution as well as the stratigraphic distribution of South Yellow Sea Basin, following the evaluation of petroleum geological conditions. Some target areas with weak deformation in middle-south area of Laoshan uplift are identified and the lower Paleozoic is selected as the key exploration strata. Some target areas such as the middle and south Laoshan uplift where deformation is relatively weak are recommended for future exploration.
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图 2 南黄海区早寒武世沉积相图
Figure 2. Sedimentary facies map of Early Cambrian in South Yellow Sea area
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图 3 南黄海区晚志留世沉积相图
Figure 3. Sedimentary facies map of Late Silurian in South Yellow Sea area
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图 4 南黄海区早二叠世沉积相图
Figure 4. Sedimentary facies map of Early Permian in South Yellow Sea area
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图 5 南黄海区晚二叠世沉积相图
Figure 5. Sedimentary facies map of Late Permian in South Yellow Sea area
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图 6 南黄海盆地残留地层总体分布特征
Figure 6. Distribution pattern of residual strata in South Yellow Sea area
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图 7 南黄海地区印支面构造图
Figure 7. Structural map of Indosinian surface of South Yellow Sea area
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图 8 南黄海地区加里东面构造图
Figure 8. Structural map of Caledonian surface of South Yellow Sea area
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图 9 下扬子地区碎屑岩储集空间镜下特征
a长石石英砂岩，颗粒间溶蚀孔隙，二叠系龙潭组，巢湖地区。单偏光，×40；b石英砂岩，溶蚀缝。泥盆系五通组，南京周边地区。单偏光，×40
Figure 9. Characteristics of the reservoir space in clastic rocks in Lower Yangtze areas
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图 10 南黄海中、古生界储盖组合特征
Figure 10. Mesozoic and Paleozoic reservoir and cap assemblages in South Yellow Sea
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图 12 印支末期崂山隆起构造分区
Figure 12. Tectonic division of Laoshan uplift at late Indo-sinian epoch
表 1 下扬子和南黄海地区烃源岩地化特征综合对比
Table 1 Comparison of the geochemical characteristics of source rocks between Lower Yangtze and South Yellow Sea areas
层位 沉积环境 主要岩石类型 主要生物 氧化还原条件 整体均值/(TOC%) 有机质类型 有机质成熟度 厚度/
m下扬子 南黄海 ∈1 盆地 泥/页岩 蓝绿藻、绿藻 厌氧 4.22 无资料 Ⅰ 高—过成熟 50~300 O3w~S1l 陆棚 页岩、泥岩 放射虫、海绵骨针、硅藻、笔石 准厌氧—厌氧 1.28 Ⅱ 高成熟 40~80 P1q 缓坡 碳酸盐岩 裸海松藻、筳、介形虫、腕足、珊瑚等 贫氧—厌氧 1.32 1.21 Ⅰ 成熟—高成熟 24~77 P2l 沼泽 泥岩/煤 头足、腕足、瓣腮、植屑 常氧 2.1 1.57 Ⅲ 234~252 P2d 陆棚 泥岩 放射虫、菊石、海绵骨针 厌氧 1.8 1.75 Ⅱ 45~80 
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