Maximize the Value of Image Log Data and Core Samples: How To Utilize Geological Data

Morelli, Chiaki (Schlumberger K.K.) | Kodaira, Chihiro (INPEX Corporation) | Irie, Shiori (INPEX Corporation)

OnePetro 

Abstract

For the past several years, cores and image logs have been utilized extensively by petroleum geologists to solve many exploration and development related challenges.  However, maximum utilization of these data has not been achieved due to lack of availability of advanced computation techniques and methodology. Because of the limited utilization, the need for these very important logging data may be questioned, particularly in this highly cost-sensitive period of oil industry. In this study, different advanced techniques have been systematically demonstrated to display the maximum utilization of this logging data for oil exploration and development activity.

Much critical information, such as rock texture, thin laminations, formation dip, and reservoir heterogeneity, cannot be clearly understood using conventional log data because of very low resolution. INPEX geologists decided to conduct a detailed analysis on existing core samples and image log data to identify and understand heterogeneous reservoir properties that will be critical information for future field development.

At the beginning of the workflow, raw data from the field were carefully processed though accurate depth matching and applying the most accurate processing parameters. After initial processing of field data, different advanced techniques were applied to achieve the maximum amount of high-resolution information from these data utilizing Techlog*wellbore software platform:

  • Log quality control
  • Image calibration with shallow resistivity
  • Static and dynamic image creation
  • Fullbore image creation
  • Slab-like image creation
  • Dip picking
  • Sand counting analysis
  • Sand resistivity spectrum analysis
  • Porosity spectrum analysis

 

To achieve the most information from core photography data, core slab photographs were converted to digital array data through the latest technique of core array creation. First, core photographs(whole core four-direction photograph and slab photograph) were loaded into the Techlog platform, and core photos were converted to red, green, blue, and grayscale 2D arrays.

 

*Mark of Schlumberger

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