Tight thin reservoir prediction in Maling Oilfield

In the Chang 81 formation, Maling Oilfield, Ordos Basin, there are two sets of tight sands, viz. Chang 81 1 and Chang 81 3. The tight sands are thin with sharp lateral variation. This paper discusses some approaches for tight thin sand prediction. Using both self-organizing neural network waveform classification and frequency decomposition, we characterize this kind of thin reservoirs based on seismic forward modeling, and also predict their distributions. The predictions are mutual corroborated by these two approaches. Results show that our approaches are efficient.