Abstract

The optimum quality geophysical data is key input to the explorationist in oil industry. To fulfill the aspirations of explorationist, acquiring the desired quality seismic data had been a concern and prime objective of field Geophysicists. Various Quality Control (QC) norms and techniques had been developed to monitor and improve the quality of data at acquisition stage. Since the damage caused to the data at this stage cannot be recovered afterwards by processing or interpretation. In this direction, the authors have made an attempt to further sharpen the QC tools by developing Quantification of Quality. In this methodology, the primary elements contributing to the quality of the data are identified at acquisition stage and each identified element is assigned a weightage factor. Adding all these compounded weighted factors, the total Quality Control weightage for each shot is computed. The weighted information is tabulated for each shot and data quality is represented in the form of various contour maps viz. composite QC map, Frequency content map, Optimum Depth / Drilled Depth map etc. The information is prepared and upgraded on daily basis resulting in real time quality monitoring in field. The weaker quality zones are analyzed to find out the reasons for deterioration of data quality and remedial measures are taken in the field itself. These maps help not only to monitor and improve the quality on day-to-day basis but would immensely help in processing and interpretation of the data.