Velocity-Porosity-Mineralogy Model for Unconventional Shale and Its Applications to Digital Rock Physics

Rock physics characterization of shale reservoirs: a case study

Unconventional resources are typically very complex to model, and the production from this type of reservoirs is influenced by such complexity in their microstructure. This microstructure complexity is normally reflected in their geophysical response, and makes them more difficult to interpret. Rock physics play an important role to resolve such complexity by integrating different subsurface di...

Porosity and Permeability Analysis on Nanoscale Fib-sem 3d Imaging of Shale Rock

As oil and gas production from conventional reservoirs is declining and oil price is going up, unconventional mudstone reservoirs (“shale-gas”) are becoming more important. However, while their characterization is of utmost importance for production planning, these low permeability rocks are very challenging to characterize due to their complex nano-scale pores and mineral structure. 3D imaging...

Experimental Mineralogy and Mineral Physics

A Crossplot for Mud Logging Interpretation of Unconventional Gas Shale Reservoirs and its Application

The drilling time data of gas logging are used to calculate drilling time ratio of the reservoir, and the total hydrocarbon data are used to calculate hydrocarbon contrast coefficient and to establish the drilling time ratio--hydrocarbon contrast coefficient crossplot. The standards of distinguishing the boundaries of hydrocarbon zones, hydrocarbonaceous water layers and dry layers are determin...

Joint Estimation of Porosity and Saturation Using Stochastic Rock Physics Modeling

Porosity and saturation are fundamental sedimentary properties that affect both seismic wave propagation and appraisal development and production of an oil field. Traditionally, these parameters have been estimated from seismic impedances and velocities using Biot-Gassman theory and/or or porosity-velocity relationships. However, when using theory to relate surface seismic attributes to reservo...