A comparison of the correlation structure in GPR images of deltaic and barrier-spit depositional environments

We have used geostatistical analysis of radar reflections to quantify the c orrelation structures found in 2-D ground-penetrating radar (GPR) images. W e find that the experimental semivariogram, the product of the geostatistic al analysis of the GPR data, is well-defined and can be modeled using stand ard geostatistical models to obtain an estimate of the range or correlation length, and the maximum correlation direction, in the 2-D GPR image. When we compare the results from geostatistical analysis of GPR data from select ed deltaic and barrier-spit depositional environments we find different cor relation structures in GPR images from different depositional environments. GPR images from braid deltas have near-horizontal correlation directions a nd correlation lengths on the order of a few meters. In contrast, the GPR i mage of a fan-foreset delta has a very long (>24 m) correlation length and a maximum correlation direction plunging 20 degrees. In the GPR images from barrier spits, we find maximum correlation directions that are horizontal or plunging a few degrees. The correlation lengths range from 7 to 43 m, de pending on the orientation of the GPR image relative to spit end growth, an d on the specific radar facies that is analyzed.