缝洞气藏断层油气保存条件评价

针对四川盆地下二叠统缝洞气藏地质特征，研究认为其断层油气保存条件应侧重于断层垂向封闭性，地层压力可作为直接判断依据。建立了判断保存条件的定量标准——保存系数，它表征断层破坏保存条件导致部分天然气散失后，缝洞系统中保存气量与原有气量的相对比值

APPRAISAL OF PRESERVATION CONDITIONS OF FRACTURE-CAVITY GAS RESERVOIR IN A FAULTED ZONE

Aimed at the geological characteristics of fracture cavity gas reservoir of the Lower Permian in Sichuan Basin, this paper proposes that the vertical sealing of a fault should be stressed and the formation pressure should be considered as the direct indicator in appraising the preservation conditions of the fracture cavity gas reservoir in the faulted zone. The author puts forward a quantitative concept, preservation coefficient ( C p), which represents the relative ratio of the existing gas reserve and original gas reserve of the fracture cavity gas reservoir affected by a fault.