Oil and gas industry is one industry that requires a long process, a high technology, high cost and even high risks that need to work. One such process is Petrophysics Interpretation or better known as the well logging. Petrophysics is the study of rocks and their interaction with the fluid (gas, liquid hydrocarbons, and other solvent). Meanwhile, well logging is the process of making the details of the physical measurements of the geological formations penetrated by the borehole. In doing well logging required components, such as main equipment (equipment drillers), the control room where the engineers works, computer units to digitize the data obtained, and the logging tools. Logging tools are an sensor to determine the physical properties of geological formations in the borehole which is divided into a variety of shapes (arm, pad, and mandrel). Based on the process of implementation, logging is divided into several types of open hole logging, cased hole logging, and even perforation and production logging. Well logging process can be reclassified based on where we put the logging tools, there wireline logging, logging while drilling, and tractor. The data obtained from the well logging process varies from depth, caliper, gamma-ray (GR), density (RHOB), neutron porosity (NPHI), sonic travel time (DTC), until the resistivity (R). Once the data is obtained from a wellbore, the data is processed by various measures. The step is the preparation of data, loading data, QC data, environtmental correction, preinterpretation and computation, parameters, volume of shale, porosity, resistivity or Rt true, water saturation and permeability. After all the process is done then the physical properties of the rock formations there and penetrated by the well where do logging can be known. 

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