【摘要】 靖边气田下奥陶统气藏马家沟组五段侵蚀沟异常发育,过去对它的研究主要是利用钻井、地震波形及古风化壳上下地层补偿关系进行定性或半定量识别,这些方法对规模较大的侵蚀沟刻画精度较高,但对规模稍小的井间二、三级侵蚀沟较难准确辨别。用试井分析和动态法验证了井间二、三级侵蚀沟的存在,为精细刻画地质模型提供了依据。结合钻井约束、地震波形等特征,验证下奥陶统气藏存在一级侵蚀沟16条,二级侵蚀沟83条,三级侵蚀沟206条。更多还原

【Abstract】 Grooves are extremely developed in No.5 Member of Majiagou formation of the Lower Ordovician in Jingbian gas reservoir.In the past,the grooves were studied mainly by drilling,seismic waveform and compensation relationship between upper and lower layer of paleo-weathering crust for qualitative and semi-quantitative identification.The large scale grooves could be identified easily,while the small scale (second-tertiary class) cross-well grooves were difficult to identify.This paper verifies the existence of such grooves boundary by using dynamic methods such as well test analysis and production transient analysis,providing basis for fine depicting the geologic model.Combined with drilling constraints,seismic waveform and arc length parameters,there exist 16 primary grooves,83 secondary grooves and 206 tertiary grooves in Lower Ordovician gas reservoir in this area.更多还原