Hydrocarbon geological conditions and exploration prospects of Lower Paleozoic in the South Yellow Sea Basin
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摘要:
钻探、包裹体分析及地球化学探测表明，南黄海盆地深部海相中—古生界存在油气充注过程，具备较好的油气资源潜力。基于南黄海盆地最新的地震资料解释成果和邻区下扬子陆域最新的钻井资料的充分认识，通过对南黄海中—古生代海相盆地的构造区划、下古生界成藏要素及油气成藏组合的系统分析，阐述了下古生界油气地质条件与勘探前景。研究结果表明：①南黄海盆地是受多期构造运动叠加改造形成的残留盆地，下古生界构造形变作用较弱，地层保存较完整，盆地中部崂山断隆带的高石稳定带构成了下古生界构造相对稳定带；②下古生界油气地质条件较优越，下寒武统烃源岩厚度较大且有机质含量较高，以Ⅰ型干酪根为主，中寒武统—奥陶系多发育交代白云岩和颗粒灰岩，可作为较好的储集层，上奥陶统—下志留统厚层泥质岩广泛发育，具备较好的封盖能力，可作为一套区域性盖层；③下古生界生储盖组合配置良好，相对稳定的高石稳定带发育多个大型构造圈闭且存在油气充注，构造圈闭与油气形成时空匹配较好，后期构造破坏较弱，油气保存条件较好，可作为南黄海盆地深部海相油气勘探的有利区带。
Abstract:Drilling, inclusion analysis and geochemical prospecting indicate that oil and gas charging process exists in the deep marine Mesozoic-Paleozoic strata in the South Yellow Sea Basin, which is endowed with a good potential of oil and gas resources.Based on the latest seismic data interpretation of the South Yellow Sea Basin and fully understanding of the latest drilling data in its adjacent Yangtze Platform, the geological conditions and exploration prospects of oil and gas in the Lower Paleozoic are described through systematic analysis on tectonic division of the Mesozoic-Paleozoic marine basins, hydrocarbon accumulation elements and assemblages of Lower Palaeozoic.The results show that: a.The South Yellow Sea Basin is a residual basin formed by the superposition and reconstruction resulting from multi-stage tectonic movements.As the Lower Paleozoic tectonic deformation is weak, the strata are relatively well preserved.The Gaoshi stabilized zone of the Laoshan fault uplift in the middle of the basin constitutes the Lower Paleozoic tectonic stable zone.b.Palaeozoic strata possess relatively superior geological conditions for oil and gas resources, of which the Cambrian source rock is characterized by great thickness and high contents of organic substance dominated by typeⅠkerogen.Metasomatic dolomite and granular limestone are mainly developed in Middle Cambrian to Ordovician, which can be used as better reservoirs.The thick argillaceous rocks of Upper Ordovician to Lower Silurian are widely developed and have good sealing ability, which can be used as a set of regional caprocks.The source-reservoir-caprock combination is well developed in Lower Paleozoic, and several large structural traps and hydrocarbon charging exist in the Gaoshi stable zone.As the structural traps match well with the formation of oil and gas in time and space, and the late structural destruction is relatively weak, the oil and gas preservation conditions are good.Therefore, it can be a favorable area for marine oil and gas exploration in South Yellow Sea Basin.
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表 1 下扬子陆域代表性钻井下寒武统烃源岩主要特征
Table 1. Characteristics of Cambrian source rocks of representative wells in the Lower Yangtze Platform
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表 2 下扬子陆域代表性钻井下古生界储层特征
Table 2. Lower Paleozoic Reservoir rocks of the representative wells in the Lower Yangtze Platform
代表性
钻井层位 (潜在)储
层厚度/m孔隙度
/%渗透率
/mD储集空
间类型苏121井 炮台山组 68 0.2~8.51 / 溶孔、溶洞 许24井 炮台山组 83.2 0.6~5.7 / 溶孔、缝洞、溶洞 兴参1井 观音台组 4 9.2~34.4 29.7~1164.1 蜂窝状溶孔、裂缝 苏103井 观音台组 5.6 0.63~2.73 / 溶孔、溶洞、晶间孔 许9井 观音台组 81.2 0.5~3 / 溶孔、缝洞、溶洞 N2井 红花园组 >54 / / 溶孔、缝洞、溶洞 昆3井 仑山组 / 最高5.54 0.42~21 晶间孔 注：部分数据据参考文献[21-22]整理；“/”为无相关数据
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