西澳大利亚珀斯盆地页岩气资源研究

摘要

The Perth Basin is located on the west coast of Australia, a key area of shale gas resource exploration in Western Australia. The basin is belonged to complex depressed rift;marine sedimentary Permian Carynginia Formation and early Triassic Kockatea shale are considered as potential gas-bearing strata. Through massive foreign language documents hunting and analysis, all-roundly summa⁃rized physical and chemical characteristics of gas-bearing zone of interest in the basin. Total organic carbon (TOC) in Carynginia For⁃mation is 1%~15%, kerogen type III, Ro 0.56~1.91;TOC in Kockatea shale is 1%~4%, kerogen type mixed II/III, Ro 0.48~1.93. Total⁃ly 11 lithofacies members have been partitioned from the two above, in which, black shale member and pyrite-containing mudstone member are most important hydrocarbon generation gas-bearing strata. Comprehensively considered the strata, geochemical indices and rock geophysical properties, shale gas sweetzones of reference have been delineated.%珀斯盆地位于澳大利亚西海岸，是西澳大利亚页岩气资源勘探的重点区域。该盆地属于复杂的凹陷裂谷，海相沉积二叠纪的Carynginia组和早三叠世Kockatea页岩层被认为是潜在的含气地层。通过搜集大量外文文献，全面总结了该盆地含气目标层的地物化特征，Carynginia组的总有机碳含量为1%～15％，干酪根为III型，Ro在0.56～1.91；Kockatea页岩层的总有机碳含量为1%～4%，干酪根为II/III混合型，Ro为0.48～1.93。两组共划分了11各岩相段，其中黑色页岩岩相段和含黄铁矿泥岩段是最重要的生烃含气层。综合考虑地层、地化指标和岩石地球物理性质，圈出了可供参考的页岩气甜点区。