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为了明确南堡凹陷油气成藏的地质条件,在油气藏类型及分布规律研究的基础上,通过油藏解剖、地化资料分析、断裂活动期次、烃源岩排烃期、盖层识别和砂地比分析等,利用成藏条件综合分析方法,对烃源岩、断裂、盖层、储层和构造部位5个方面的地质条件进行了详细分析,厘定了南堡凹陷油气成藏的有利地质条件及相互关系。结果表明,南堡凹陷的油气成藏具有5个有利地质条件:①2套烃源岩为油气运聚提供充足来源;②油源断裂为油气运移提供输导通道;③3套区域性盖层为油气聚集提供保存条件;④高砂地比地层为油气聚集提供储集空间;⑤油源断裂附近的正向构造为油气聚集提供有利部位。
In order to clarify the geologic conditions of hydrocarbon accumulation in Nanpu Sag, based on the study on the type and distribution of oil and gas reservoirs, through the analysis of reservoir anatomy, geochemical data, period of fault activity, hydrocarbon expulsion period of hydrocarbon source rocks, Sand and land ratio analysis and so on. Based on the comprehensive analysis of reservoir forming conditions, the geological conditions of 5 source rocks, faults, caprocks, reservoirs and structural parts are analyzed in detail, and favorable geological conditions of hydrocarbon accumulation in Nanpu Sag are determined Conditions and relationships. The results show that there are five favorable geological conditions for oil and gas accumulation in Nanpu Sag: ① 2 sets of source rocks provide sufficient source for hydrocarbon migration and accumulation; 2) oil source fracture provides a guide channel for hydrocarbon migration; ③ 3 sets of regional cap rocks are Oil and gas accumulation to provide the preservation conditions; (4) high sand than the formation of oil and gas accumulation to provide storage space; (5) the positive tectonics near the fracture of the oil source to provide favorable sites for oil and gas accumulation.