SHALE GAS RESERVOIR-FORMING CONDITIONS AND EXPLORATION PROSPECT IN PERMIAN SHANXI FORMATION OF THE SOUTHERN NORTH CHINA BASIN
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摘要: 对南华北盆地二叠系山西组暗色泥页岩发育的地质背景、有机地球化学参数以及钻井资料的分析研究表明,南华北盆地二叠系山西组暗色泥页岩在研究区内分布广泛,沉积厚度达30~100 m,其中在太康、鹿邑地区的平均厚度超过60 m;有机质丰度中等—高(1.76%~4.16%),镜质体反射率适中,有机质处于成熟—过成熟阶段。研究区山西组地层发育微孔隙、微裂缝等孔隙类型,储集性能较好。等温吸附实验测得暗色泥页岩吸附气含量平均为1.32 m3/t,表明山西组暗色泥页岩具有较强的吸附能力,吸附性较好。综合研究认为,南华北盆地二叠系山西组暗色泥页岩在荥阳—通许—太康—郸城一带分布厚度大,埋深适中,页岩气保存地质条件较好,具有良好的资源开发前景。Abstract: Dark shale is widely distributed in the Shanxi Formation of Permian in Southern North China Basin. Exploration prospects of shale gas in the region were studied in this paper based on the geologic background and the geochemical and drilling data. The Shanxi Formation ranges from 30 up to 100 m in thickness with an average of over 60 m in Taikang-Luyi area characterized by medium-high abundance of organic matter(1.76%-4.16%), and medium vitrinite reflectance. The organic matters are highly and over highly matured. Micro-cracks, and other types of pores are well developed for the formation of high quality reservoirs. The isothermal adsorption experiment shows that the dark shale has strong adsorption ability, which is 1.32 m3/t on average. It is concluded that the region of Xingyang-Tongxu-Taikang-Dancheng within the Southern North China Basin is favorable for shale gas exploration.
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Key words:
- shale gas /
- reservoir-forming condition /
- Shanxi Formation /
- Southern North China Basin
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