Unconventionals and Shale Gas Reservior

Unconventionals and Shale gas reservoir ha
ve become increasingly important potential sources of natural gas in the world. Shale gas reservoir is different from the traditional structural and lithologic trapping reservoir. First of all, clay platelets are the main constituent which give rise to strong anisotropy due to their shapes as well as preferred orientation during mechanical compaction and diagenesis. secondly,Organic richness can also have a significant influence on the anisotropy of shales. In addition,The presence of pores and microcracks during thermal maturity of organic matter is another reason for shale anisotropy.

During Phase 8, the anisotropy properties and rock physics modelling of shales was studied. Well logs from Barnett formation provided by Marathon oil have been analyzed through creating rock physics templates, microstructural parameters estimation and seismic modelling.

Shale rock physics modelling
Rock physics templates

The quantitative characterization of anisotropy for organic shales was also studied. Aspect ratio and Orientational Distribution Function (ODF) are used to analyze anisotropy originated from shapes and preferred orientation. The model is able to estimate elastic stiffness of organic shales if the mineralogy and kerogen content are known.

The 3D hydraulic fracturing process was simulated to calculate the real-time velocity model of fracturing domain and analyze the influence of fracturing process on microseismic propagation.

Symulation of hydraulic fracturing

In Phase 9, We will continue to develop methodologies including rock physics modelling of non-source shales and soure shales, Seismic response and inversion scheme to estimate the organic content, porosity and brittleness parameters. We will also endeavour to develop a GUI tool to incorporate these functions.