Fractal Characteristics and Model Applicability for Pores in Tight Gas Sandstone Reservoirs: A Case Study of the Upper Paleozoic in Ordos Basin

2020 ◽  
Vol 34 (12) ◽  
pp. 16059-16072
Author(s):  
Yunbing Hu ◽  
Yinghai Guo ◽  
Jingwen Shangguan ◽  
Junjian Zhang ◽  
Yu Song
Keyword(s):  
Ordos Basin ◽  
Tight Gas ◽  
Upper Paleozoic ◽  
Fractal Characteristics ◽  
Sandstone Reservoirs ◽  
Tight Gas Sandstone

Seismic estimation of fluid saturation based on rock physics: A case study of the tight-gas sandstone reservoirs in Ordos Basin

2021 ◽  
pp. 1-47
Author(s):  
Chao Li ◽  
Peng Hu ◽  
Jing Ba ◽  
José M. Carcione ◽  
Tianwen Hu ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Rock Physics ◽  
Gas Production ◽  
P Wave ◽  
Quantitative Prediction ◽  
Rock Fragment ◽  
Tight Gas ◽  
Fluid Saturation ◽  
Sandstone Reservoirs ◽  
Tight Gas Sandstone

Tight-gas sandstone reservoirs of the Ordos Basin of China are characterized by high rock-fragment content, dissimilar pore types and a random distribution of fluids, leading to strong local heterogeneity. We model the seismic properties of these sandstones with the double-double porosity (DDP) theory, which considers water saturation, porosity and the frame characteristics. A generalized seismic wavelet is used to fit the real wavelet and the peak frequency-shift method is combined with the generalized S-transform to estimate attenuation. Then, we establish rock-physics templates (RPTs) based on P-wave attenuation and impedance. We use the log data and related seismic traces to calibrate the RPTs and generate a 3D volume of rock-physics attributes for the quantitative prediction of saturation and porosity. The predicted values are in good agreement with the actual gas production reports, indicating that the method can be effectively applied to heterogeneous tight-gas sandstone reservoirs.

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