Forming mechanism of low-efficiency gas reservoir in Sulige Gas Field of Ordos Basin

Sulige Gas Field is the largest gas field with reserves in place of 533.652 billion cubic meters and gas-bearing area of 4054.6 square kilometers in Ordos Basin.It is a low-efficiency gas field with low reserves abundance.The forming mechanism of low-efficiency gas reservoir in Sulige Gas Field was researched.The geological factors resulting in low-efficiency gas reservoirs in Sulige Gas Field include the strong anisotropies in the reservoir,low height of gas column resulted from very gentle structures,poor connectivity and low energy induced by ultra-low pressure in gas pay zones.