Publications

Fractured volcanic reservoirs differe from the other type of naturally fractured reservoirs in the volcanic host rock in that they are generally considered to have no primary effective porosity so that the fractures are considered to create enhanced porosity and permeability to allow hydrocarbon production. In general, volcanic rocks have been ignored because of a perceived lack of reservoir quality. Fractures were detected in the volcanic formation which enhanced porosity and permeability allowing hydrocarbon production. To exploit this type of reservoir to the fullest, comprehensive studies must be done including determination of distribution and orientation of fault and fractures, possible migrations, and trap of hydrocarbons. Fractures identification and distribution modeling has been carried out with a combination of seismic interpretation by post-stack seismic structural attributes extraction, wire line log, imaging log and cores. The first step in this study is to identify the presence of fractures in the reservoir and by doing petrophysical analysis on the well data, which are predicted from: 1) the analyses of fracture occurrences based on FMI data, core and conventional log, 2) petrophysical analyses to calculate the fracture porosity, fracture aperture, and fracture permeability using an artificial networking concept, and 3) The analyses of fracture characteristics such as geometry, genetic, and its geomechanical properties to separate the fractures based on their productivity. The next step is to perform an analyses of fractures characteristics on the 3D seismic properties. A methodology in defining the fractures in this study is the optimized post-stack structural seismic attributes that comprise the instantaneous phase, advanced coherence, and automatic fault extraction. Then, the fractures characteristic maps are constructed to predict geometry, distribution, and productivity fracture. The final integrated model can predict the productive fracture, hydrocarbon prospect zone, and make a drilling proposal for a directional well in order to penetrate perpendicular of the productive fracture.