Variable-depth streamer acquisition: broadband data for imaging, post and pre-stack inversion

Broadband Seismic Methods for Towed-streamer Acquisition

An efficient 4D processing flow for variable-depth streamer data

Variable-depth streamer acquisition is now widely used, achieving a bandwidth of more than 6 octaves (2.5 to 200 Hz) and excellent lateral resolution and providing improved impedance and reservoir analysis. This acquisition and processing method is based on towing the streamer deep, using a variable-depth profile optimized to ensure receiver notch diversity at the imaging stage and a deghosting...

Pre-stack Simultaneous Inversion of 3D Seismic Data for Velocity Attributes to Delineate Channel Sand Reservoir

Channel sand acts as stratigraphic trap for hydrocarbon accumulation in many parts of the world. Delineation of this type of reservoir is crucial as channel sand may be scarce and inaccurate location of the drilling wells could lose a huge currency. To differentiate channel sand from the host rocks, attributes such as P and S wave velocity ratio plays a vital role in the study area. The velocit...

Three-dimensional inversion of towed streamer electromagnetic data

A towed streamer electromagnetic system capable of simultaneous seismic and electromagnetic data acquisition has recently been developed and tested in the North Sea. We introduce a 3D inversion methodology for towed streamer electromagnetic data that includes a moving sensitivity domain. Our implementation is based on the 3D integral equation method for computing responses and Fréchet derivativ...

Comparing Post-stack AVO Inversion to Prestack Inversion for Estimating Rock Properties

Inversion of seismic data to rock properties is not a new method, however there are a wide variety of methodologies available one can use to achieve those estimates. The number of potential AVO equations one has access to now exceeds what many would consider useful. The problem then becomes, which of the several methods should be applied, given a specific exploration or development goal? While ...