Publications

Continuous excellent limestone and igneous rocks exposures in Grasberg Open Pit shows that shear fractures are numerous and extensively distributed. These fractures are interpreted as a result of a leftlateral Riedel shear system trending ~N600W (Sapiie, 1998), with approximate maximum displacement of 1 km (Sapiie and Cloos, 2004). Pervasive R-shears, trending NE-E were studied in detail to obtain several character that is thought to be useful in assessing fractured reservoir.The result of this study shows that fault intensity throughout the area varies locally. A particular area can be classified and characterized as having: (i) high fault intensity characterized by fault spacing less than 5 meters, (ii) medium fault intensity characterized by fault spacing between 5 and 10 meters, and (iii) low fault intensity characterized by fault spacing more than 10 meters.In the TK Formation (New Guinea Limestone Group), fault intensity correlation was performed for traverse lines that cross the same fault belt. This correlation shows that the fault intensity character is continuous for at least 600 meters in the lateral direction and 240 meters in the vertical direction.A power-law diagram of fault spacing in the TK Formation shows two best fit lines, while in the Monomict breccia DLMF Rock Unit only one best fit line can be drawn. Furthermore, for a particular fault belt, fault intensity in the TK Formation is higher than fault intensity in the DLMF Rock Unit. This difference is interpreted to be caused by different time length of R-shears deformation, where R-shears deformation in TK Formation had developed before, during, and after DLMF formation, resulting in a more complex and more intense R-shears.