澳大利亚Georgina盆地元古代和古生代页岩特征及其页岩气远景研究

Geological Features of Paleozoic and Proterozoic Shales and Shale Gas Exploration Potential in Georgina Basin,Australia

澳大利亚Georgina盆地为元古代-古生代形成克拉通内裂谷盆地,发育了晚元古界和中寒武统海相沉积。古生代以来的多期造山运动、裂陷事件造成盆地内现今地层分布的复杂性,加大了常规和非常规油气勘探的难度。为了明确该盆地古老海相地层特征,判断其是否具备页岩气勘探的基本条件,开展了Georgina盆地的构造演化和地层充填研究,特别对海相泥页岩的特征进行了分析,并结合钻井的地球化学指标,认为Georgina盆地北部晚元古界地层和南部中寒武统地层的海相泥页岩有机质含量高、热演化程度较高,具备页岩气勘探的基本条件。

Georgina Basin, an onshore intra-cratonic basin in Australia, deposited marine shale in Paleozoic and later Proterozoic. Conventional and unconventional oil exploration are both difficult in the basin because of the complex sedimentary resulted from multiple orogenic and rifting events. Tectonic evolution, sedimentary deposi- tion, marine shales features and geochemical data have been studied in order to indentify the potential of shale gas exploration in Georgina Basin. The result suggests the marine shales in northern and southwestern Georgina basin have elementary conditions of shale gas exploration.