摘要
基于实测压力、流体包裹体数据,利用盆地模拟技术,对潍北凹陷的现今地层压力、成藏期古压力以及压力演化特征进行了分析。结果表明,潍北凹陷现今地层压力纵向上分为2段,2 300 m以上地层主要发育常压,2 300 m以下的地层出现大量的低压,低压主要分布于凹陷北部的孔二段地层中。研究区成藏期储层古压力多表现为弱超压,盆地模拟表明孔二段地层经历了"压力积累—压力释放—压力分异"3个演化阶段;基于后期保存条件的差异,划分为"常压—超压—弱超压"、"常压—超压—低压"、"常压—弱超压—常压"3种演化模式。由于成藏期时凹陷东南部剥蚀量最大,压力减少最快,成为油气运移指向的低势区,导致了油气多富集于潍北凹陷的东南部。
Based on measured pressure and fluid inclusion data, the current formation pressure, the paleopre-ssure during petroleum accumulation and the characteristics of pressure evolution in the Weibei Sag were studied by means of basin modeling technology. At present, the formation pressure in the study area can be divided into 2 segments vertically：normal pressure above 2 300 m and low pressure below 2 300 m, mainly found in the 2nd member of the Kongdian Formation in the north. The paleopressure during petroleum accumulation period mainly appeared to be low overpressure. Basin modeling showed that the formation pressure in the 2nd member of the Kongdian Formation evolved through 3 levels：“pressure accumulation-pressure release-pressure differentiation”. Due to different preservation conditions, the pressure evolution was divided into 3 patterns：“normal pressure-over pressure-low overpressure”, “normal pressure-over pressure-low pressure”, and “normal pressure-low overpressure-normal pressure”. Since the southeast of the sag was eroded obviously during accumulation, and the formation pressure decreased rapidly, this area became the target for petroleum migration.
出处
《石油实验地质》
CAS
CSCD
北大核心
2014年第2期160-164,共5页
Petroleum Geology & Experiment
基金
国家重大科技专项(2011ZX05006-003)
山东省自然科学基金(ZR2011DL009)联合资助
关键词
地层压力
压力演化
油气分布
潍北凹陷
渤海湾盆地
formation pressure
pressure evolution
petroleum distribution
Weibei Sag
Bohai Bay Basin
