南襄盆地泌阳凹陷陆相页岩气形成条件研究

Generation conditions of continental shale gas in Biyang Sag,Nanxiang Basin

参照美国海相非常规天然气—页岩气评价指标,首次对中国新生代陆相湖盆——南襄盆地泌阳凹陷核桃园组页岩气形成条件进行较系统地研究。综合研究认为,该区核桃园组页岩分布范围广,单层厚度大;有机碳含量较高;热演化程度与美国泥盆系盆地相当;含气页岩测录井响应特征明显;页岩储集空间类型发育微孔隙、微裂缝,储集性能较好;页岩气保存条件好;储层石英等脆性矿物含量高,易于页岩气储层压裂改造,具有较好的页岩气形成条件,资源潜力大,勘探前景良好。

Generation conditions of shale gas from the Hetaoyuan Formation in the Biyang Sag of the Nanxiang Basin were systematically studied according to the U. S. A marine shale gas evaluation index for the first time. The Hetaoyuan Formation extends widely with big thickness of single layer in the region. The TOC content is high and the thermal evolution degree is equivalent to that of Devonian basins in the U. S. A. The responses of gas-bearing shale in well logging are obvious. Micro fracture and micropore are well-developed in shale, providing good condition for reserving. Gas is well preserved in shale. The high content of brittle minerals such as quartz is favorable for reservoir fracturing. Shale gas exploration prospect is bright in the Biyang Sag where is favorable for shale gas forming and the potential resource of shale gas is huge.