Publications

The "X" field which is located in Tuban Block (East Java Province) was discovered in 1994, after more than 10 years of production much remains interesting to be studied. As the main field at Tuban Block, the "X" carbonate having unique reservoir characteristic, where reservoir properties of each wells are heterogeneous in porosity and permeability. Until 2003, the 2D seismic has still been the primary data for development in this area. Limitation of 2D seismic data is limited resolution either lateral or vertical. Proper image sub-surface (sub-surface imaging) is less optimal sane for reef carbonate and 2D modeling is less flexible so that sub-surface information "X" data using 2D seismic limited. In 2004, 3D data was acquired as solution for limitation of the 2D data."X" field (2830 acres) is at survey 3D area (185 km2). Geophysical and geological modeling has applied 3D model to increase oil production or at least make it stable. The result of 3D seismic mapping on this area shows that "X" field extended to north-east and less to the south. Many inversion models that controlled by the selected wells were constructed. Qualitatively, sparse spike inversion model is the most representative method to describe reservoir distribution compare with other method (band-limited and model based), where as to find statistical relation seismic attributes with well log data by using seismic attribute analysis (reflection strength, instantaneous phase, and instantaneous frequency). The combination analysis from seismic data (seismic attribute and inversion) gives information about characterized reservoir to detect hydrocarbon along with spread. The result of 3D seismic data shows that effective porosity more than 20% (Fef > 20%). It obtaines reservoir distribution extended to north-west, so wells could be constructed in this area.