Abstract:

There are 5 sets of source rocks in the south of North-China Bain.Among them,the Permian-Carboniferous source rock is the key.There are good conditions for secondary hydrocarbon-generation in the sags with thick Tertiary and Quaternary systems.In this area,weathering crust of the Paleozoic carbonate and the Permian sandstone are the major reservoir beds,and the Carboniferous bauxitite of Taiyuan Formation and Benxi Formation are high-quality capping beds.There developed a great variety of structural traps and stratigraphic traps in this area.233 traps with total area of 4225.65 square kilometers have been discovered. 10 promising sags were chosen as the resource assessment units.The analogy method was taken as a primary assessment method,and the basin simulation method was applied in Luyi Sag and Huangkou Sag.The total expected oil in place value of the 10 sags is 352.6 million tons,and the total expected gas in place value is up to 160.6 billion cubic meters.The comprehensive assessment shows that Shangqiu Sub-sag and the middle and west of Huangkou Sub-sag in Huangkou Sag,the slope play of Huangkou Sub-sag toward Dangshan salience and Dalian Anticline of Luyi sag are the promising exploration targets.

Key words: North-China Basin, south area, oil and gas geologic condition, secondary hydrocarbon-generation, analogy method, resource assessment, exploration prospect

摘要：

华北盆地的南部地区发育有5套烃源岩,其中石炭-二叠系烃源岩是全区的主力烃源岩,在第三系、第四系沉积厚度较大的凹陷存在二次生烃的条件.下古生界碳酸盐岩古风化壳和二叠系砂岩为该区主要储集层,石炭系太原组和本溪组的铝土岩为优质盖层.该区发育多种类型的构造圈闭和岩性地层圈闭,已发现各类圈闭233个,总计圈闭面积为4225.65km².选择了10个有利凹陷作为油气资源评价的单元,评价方法以类比法为主,但对鹿邑、黄口2个凹陷应用盆地模拟法进行了油气资源评价.10个评价凹陷的总地质资源量:油期望值为3.526×10⁸t,气期望值为1606×10⁸m³.综合评价结果表明,黄口凹陷的商丘次凹及黄口次凹中、西部和黄口次凹向砀山凸起的斜坡带,鹿邑凹陷大连背斜是油气勘探的有利区带.

关键词: 华北盆地, 南部地区, 油气地质条件, 二次生烃, 类比法, 资源评价, 勘探方向