Geomechanical Modeling of Reservoir Rock Using 2D Seismic Inversion: Its Application to Wellbore Stability in the Onshore of Northwest Java']Java Basin, Indonesia

Geomechanical modeling has been carried on Upper Cibulakan Formation, Baturaja Formation and Talang Akar Formation in the onshore of Northwest Java Basin. The three-dimensional (3D) geomechanical modeling provides elastic properties data such as bulk modulus, elastic modulus, Young modulus. The objective of this study is to characterize mechanical rock properties, and pressure also to predict wellbore stability for next exploratory well. Geomechanical modeling of an area is necessary for the drilling trajectory design so it would reduce the drilling operation cost. The study area is located in the onshore area of Jatibarang Sub-basin, North West Java Basin. This field is formed by several formations, which are Upper Cibulakan Formation, Baturaja Formation, Talang Akar Formation and Jatibarang Formation. This study consist of several works such as regional geological and pressure reviews, log and seismic data conditioning, geomechanical one-dimensional (1D) model, and establish geomechanical 3D cube by integrating well and seismic inversion data. The optimization of limited exploration data based on well log and the different vintage of two-dimensional (2D) seismic is one of the problems that would be discussed. The problems could be solved by leveling amplitude seismic and conditioning well log. The recommended drilling mud weight from pressure and stress analysis has range about 8.5-10.7 ppg from Upper Cibulakan Formation (MMC) to Talang Akar Formation. The recommended drilling mud weight is used for next exploration well.