论文部分内容阅读
以中上扬子地区早古生代2套含气页岩为研究目标,结合2套层位古生物发育特征与保存情况,并运用图像分析方法建立了笔石立体结构模型,定量对比分析了2套层位有机质孔隙结构特征。筇竹寺组炭质化石以藻类为主,受矿化影响明显,化石内部孔隙空间较大但相对孤立分布,且围岩致密,分散有机质内海绵状孔隙发育程度低于龙马溪组。龙马溪组保存了大量炭化笔石薄膜并沿层面发育,高TOC层段与高笔石丰度层段对应发育,导致气体有利赋存空间与岩石力学薄弱面直接相连;同时笔石体呈多层炭化薄膜保存,保留有一定的层间孔隙,通过笔石体立体模型的建立,表明笔石体内仍有一定的孔隙空间,沥青填充部分孔隙,对气体的保存起到积极影响。
Taking the two Paleozoic gas-bearing shales in the middle-upper Yangtze region as the research goal, combining with the paleo-biological development characteristics and preservation of two sets of layers, and using image analysis method, the three-dimensional structure model of pen-stone was established. Organic matter pore structure characteristics. Qiongzhusi carbonaceous fossils dominated by algae, affected by mineralization obvious, fossil internal pore space larger but relatively isolated distribution, and dense rock, scattered organic matter within sponge-like pore development degree is lower than the Longmaxi group. The Longmaxi Formation preserved a large number of carbonized penolith films and developed along the strata. The high TOC intervals corresponded well with the high penaeid abundance intervals, resulting in the favorable gas storage space being directly connected with the weak mechanics of the rock mechanics. At the same time, The layer of carbonized film is preserved, and some of the interlayer pores are reserved. Through the establishment of the penolith body model, it is indicated that there is still some pore space in the penolith body and some of the pores are filled with the pitch, which has a positive effect on gas preservation.