First report of TSR origin minerals filled in anhydrite dissolved pores in southeastern Ordos Basin

摘要

1.Objective Yican 1 well, drilled in Southeastern Ordos Basin by Oil & Gas Survey, China Geological Survey in 2014 produced 3.7×104 m3 natural gas daily, which is the most productive well in the area by far. However, the reservoir quality is poor compared with those of Jingbian gas field in the middle of the Basin, which is mainly caused by the pores filling in karst reservoir.