Abstract Overbalanced drilling is the most common technique; nevertheless, it has several disadvantages such as formation damage, mud losses, and stuck pipes; challenges that are in high permeability zones highly fractured formations. To overcome those issues, underbalanced method could be implemented. The (UBD) technique widely utilized hard, under pressure, depleted, fractured/vuggy Low-densi...

Based on percolation mechanism of fractured reservoirs and simulation technique, the numerical simulation software of fractured reservoirs has been developed on PC-Linux environment, which is on the basis of DQHY simulator of three dimensions and three phases. It can treat dual-porosity/singlepermeability and dual-porosity/dual-permeability model. The results of examples indicate that the perfo...

Décollement zones within the organic-rich black shale members of the basal Marcellus Formation in New York and Pennsylvania have been recognized for some time (Nickelsen, 1986; Evans, 1994, among others). Outcrop study of the upper Onondaga Formation-Marcellus Formation contact at three localities in the central New York outcrop belt (Figure 1) demonstrates that thrust fault structures are pres...