鄂尔多斯盆地南部中生界大中型油田形成条件与勘探策略

为查明鄂尔多斯盆地南部中生界油气分布规律,寻求现实有效的勘探部署策略,以尽快实现选区油气突破和油田（藏）发现,通过对其石油地质条件的系统分析和勘探开发实践的思考总结,认为鄂南中生界油气既具有大面积生成、分布、富集并连片成藏的特点,又在不同层位和空间上聚散不一,呈现出复杂的变化格局;油藏类型以隐蔽性的构造-岩性复合油藏及岩性油藏为主,大型有利沉积相带与低幅度局部构造及其集中分布、组合发育的大规模低幅度构造背景是控制油气大面积聚集成藏的主要因素,也是大中型油田发育的基本条件.结论：在鄂南中生界这样一个具备大中型油田发育条件但勘探手段颇受限制的地区,应该兼顾上下油层,以钻井为主要手段,实行规模化勘探策略.图4参13

Geology characteristics and exploration strategy of Mesozoic large and medium oilfields in Southern Ordos Basin

In order to find out the Mesozoic oil-gas distribution regulation,design a practical and effectual strategy of exploration disposition,and realize an oil-gas breakthrough and oilfield discovery as soon as possible in the southern Ordos Basin,the petroleum geologic conditions of the basin were systematically analyzed and exploration and development practices were wholly examined.It shows that the Mesozoic oil and gas in the basin are generated,distributed,gathered and accumulated in large scales,and the gathering degrees of oil-gas in different layers and spaces are different,presenting a complicated and variable complexion.The main oil pool types are of subtle structural-lithologic oil pools and lithologic oil pools.A large size advantageous sedimentary facies belt and a low partial vertical relief structure,and large-scale and low vertical relief structure setting formed by a series of partial low vertical relief structure are the main factors of controlling the large scale oil pool formation,and are also the basic condition of forming large-medium-sized oilfields.Conclusion: Mesozoic Southern Ordos Basin has the geology condition of growing large-medium-sized oilfields,but the exploration means is restricted by the condition of geography and surface feature.A scale exploration strategy should be performed,taking into account both upper and lower oil layers and taking drilling as the main means.