裂谷盆地高效大中型气田形成的断裂输导条件

Transporting condition of faults required in formation of large and medium gas fields with high efficiency in rift basin

通过裂谷盆地天然气成藏特征分析和气藏断裂输导天然气能力综合评价参数及气藏天然气聚集效率计算,对天然气输导类型及我国裂谷盆地16个大中型气田断裂输导天然气能力进行了研究。结果表明:断裂是裂谷盆地大中型气田天然气运移的主要输导通道;随着断裂输导天然气能力综合评价参数增大,裂谷盆地大中型气田天然气聚集效率增高,反之则降低;裂谷盆地高效大中型气田形成的必要条件是断裂输导天然气能力综合评价参数应大于2.0×10-14m/(Pa.s)。

By gas accumulation characteristic analysis and calculating the comprehensive evaluation parameter of gas transporting ability through fault and gas accumulation efficiency in gas reservoir, the types of gas transporting pathway and transporting ability of faults of 16 large and medium gas fields in rift basin were studied in China. It was concluded that faults are the main transporting pathways for the migration of gas in large and medium gas fields in rift basin. Gas accumulation efficiency of large and medium gas fields in rift basin increased with the increase of comprehensive evaluation parameter of gas transporting ability through fault, conversely it decreased. Necessary condition for the formation of highly efficient large and medium gas fields in rift basin is accordingly the comprehensive evaluation parameter of gas transporting ability through fault should be greater than 2. 0 × 10^-14 m/（ Pa·s）.