RE: Back to a strong Buy 💪🏼9 Dec 2025 07:36
The flow path through a sandstone reservoir is a function of Tortuosity and Differential Pressures - Example is the Pantheon Dubhe-1H well. Plus additional Reservoir and Gas information. A Lunch and Learn Post.
>To the readers: The information below is fundamental, basic, elementary, introductory, and primary but it is essential to understanding O&G. Not for Discord Type discussions. Not knowing something is not a valid argument against it.
In Sandstone reservoirs, the pore space is the storage, The fluids such as oil, gasses and water occupy the pore spaces The connectivity from one pore space to another is the permeability. How the entire systems flows to a well bore is Tortuosity. Pantheon Resources Plc Dubhe-1H SMD-B is a sandstone reservoir with complex lithology and description.
I covered this subject material in greater detail in this Reddit Sub at this link: [https://www.reddit.com/r/invictusenergy/comments/18w8om2/a\_lunch\_and\_learn\_sandstone\_pore\_space/](https://www.reddit.com/r/invictusenergy/comments/18w8om2/a_lunch_and_learn_sandstone_pore_space/) I just want to add some more information and direct the reader to more information.
Sandstone tortuosity is a measure of the winding, convoluted path fluids (like water, oil, or gas) must take through its interconnected pores, defined as the ratio of the actual, longer flow path length (Lt) to the straight-line distance (L) between two points (τ = Lt / L). Higher tortuosity means a more twisted path, increasing resistance, reducing permeability, and slowing transport of fluids or solutes through the rock. See image below. The Dubhe-1H reservoirs are gas saturated and it is the Gas Expansion in the reservoir flowing towards a lower pressure area such as the well bore back to surface is the energy to allow the well to flow, No gas = no flow - period. In oil reservoirs, the gas is in solution and expressed as the GOR. As example; the reservoir has Gas Pore Pressure of 3,500 PSI. The well is flowing to atmospheric pressure of 14.7 PSI. The differential pressure between the reservoir and the surface pressure is what provides the Expansion Energy. In this example, about 3,485 PSI. One cubic foot of gas in the reservoir becomes about 600 cubic feet at the surface. This is the PVT relationship using the Gas Laws.

The Pantheon Resources Plc Dubhe-1H is a long 5,200 foot laterals that cross-cuts the sandstones that were deposited in a Shelf Margin Deltaic System (see image below.) The lateral connects the multiple individual types of reservoirs to the single well bore. The Dubhe-1H was fractures stimulated in 25 separate stages using Plug & Perforate Methods. The Deltaic environment contains Pro Delta and Delta Front, distributary channel, splays, overbank, and many other types of depositions due to the fresh water river channels transporting sediments that are then dumped into a marine (ocean or sea) environment. This means that there is no