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下扬子苏南地区对中生界、古生界的油气勘探已进行了四十多年 ,在地质认识和地震勘探方法等方面取得了一些进展 ,但一直未能取得发现油气藏的实质性突破 ,致使勘探仍停留在早期阶段。从SK1井钻探的基本情况入手 ,分析钻探结果与钻前地质认识的差别 ,得到以下启示 :①苏南地区关键的石油地质问题是圈闭和油气藏的保存问题。②中生界、古生界的上、下构造不协调 ,只要下古生界的区域性有效盖层存在 ,即使浅层强烈变形 ,深层仍可能保存古油气藏。③下古生界的勘探区带评价的关键性指标首先是存在有效盖层 ,然后考虑张性断层对局部封盖条件的破坏作用。④对于中生界、上古生界的勘探 ,有效的成熟烃源岩分布和生烃强度分布可能是基本问题
Lower Yangtze In southern Jiangsu, Mesozoic and Paleozoic hydrocarbon exploration has been carried out for more than 40 years, and some progress has been made in geological understanding and seismic exploration methods. However, no breakthrough has been made in discovering oil and gas reservoirs , Causing exploration to remain at an early stage. Starting from the basic situation of well drilling in Well SK1, the difference between drilling results and pre-drilling geological understanding is analyzed. The following enlightenments are obtained: ① The key petroleum geology in southern Jiangsu is the preservation of traps and reservoirs. ② Mesozoic and Paleozoic unconformities of upper and lower structures, as long as the regional effective caprocks of the Lower Paleozoic exist, the deep reservoirs are still likely to save the paleo-oil reservoirs, even though the shallow layers are strongly deformed. ③ The key indicators for the evaluation of the exploration zone in the Lower Paleozoic are firstly the existence of an effective caprock, and then the damaging effect of the Zhang fault on the partial capping condition. ④ For Mesozoic and Upper Paleozoic exploration, the distribution of effective mature source rock and hydrocarbon intensity distribution may be the basic problems