A study of frequency dependent analyses on Stratton Oil Field, South Texas.
Frequency dependent analysis has been utilized recently by the industry. It allows the seismic interpreter to see features that could not be clearly seen when dealing with the whole frequency band. This could be related to bed thickness, lithology, or physical properties of the reservoir. Stratton Oil Field was discovered in 1937, and it is well known to be a highly productive area. At the level of Oligocene Frio Formation, the Stratton field is defined by multiple NW-SW trending structures like most of the reservoirs along the Gulf of Mexico. The Frio formation is divided into upper, middle, and lower segments. Our study zone lies in the middle and lower segments. Conventional analysis processes were applied, such as; AVO, inversion, and LMR transform. The investigated zone showed different behavior at each stage of the investigation. Thus, we suggested utilizing a frequency dependent technique to investigate the dataset. Frequency dependent amplitude analysis was utilized, where anomalous behaviors were indicated at the reservoir zone. Further frequency dependent analyses showed the same anomalous behavior at the reservoir zone. The low frequencies could map the reservoir zone much more obviously, where the anomalies on every stage of the analysis had the same behavior that corresponds to the same zone. Frequency dependent analysis can help the seismic interpreter to better understand the reservoir characteristics, and can help to map the reservoir anomalies in a better way.