Microscopic Seepage Mechanism of Gas and Water in Ultra-Deep Fractured Sandstone Gas Reservoirs of Low Porosity: A Case Study of Keshen Gas Field in Kuqa Depression of Tarim Basin, China

To study the microscopic seepage mechanism of gas and water in fractured sandstone reservoirs low porosity, this kind reservoir Keshen field, Kuqa depression Tarim basin China, was taken as an example. Based on rock samples visualization technology, nuclear magnetic resonance experiments saturated water–gas drive CT scanning gas–water were conducted. The invasion during development simulated. Subsequently, distribution irreducible saturation influence factors efficiency analyzed. results show that is mainly related to structures matrix pores, fracture pattern, density. main resulting into good include large pores high angle fractures, saturation, separation between water. positively correlated with porosity dip angle. High fractures can effectively improve capability then increase drive. Besides, great proportion pore size matrix, dip, density also Therefore, for quite important since it provide guidance efficient deployment wells. significant by large-scale sand fracturing order It necessary strictly control production rate delay far possible. In case serious waterlogging, shut-in all wells a choice strengthen imbibition which recovery reservoir.