Pore-throat sizes in sandstones, siltstones, and shales: Reply
American Association of Petroleum Geologists Bulletin
By: Philip H. Nelson
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Abstract
In his discussion of my article (Nelson, 2009), W. K. Camp takes issue with the concept that buoyancy is not the dominant force in forming and maintaining the distribution of gas in tight-gas accumulations (Camp, 2011). I will restrict my response to the issues he raised regarding buoyant versus nonbuoyant drive and to a few comments regarding water saturation and production. I claim that the pressure generated in petroleum source rocks (Pg), instead of the buoyancy pressure (Pb), provides the energy to charge most tight sandstones with gas. The arguments are fourfold: (1) buoyant columns of sufficient height seldom exist in low-permeability sand-shale sequences, (2) tight-gas systems display a pressure profile that declines instead of increases upward, (3) gas is pervasive in overpressured systems, and (4) source rocks can generate pore pressures sufficiently high to charge tight sandstones.
Suggested Citation
Nelson, P.H., 2011, Pore-throat sizes in sandstones, siltstones, and shales: Reply: American Association of Petroleum Geologists Bulletin, v. 95, no. 8, p. 1448-1453, https://doi.org/10.1306/12141010159.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Pore-throat sizes in sandstones, siltstones, and shales: Reply |
| Series title | American Association of Petroleum Geologists Bulletin |
| DOI | 10.1306/12141010159 |
| Volume | 95 |
| Issue | 8 |
| Year Published | 2011 |
| Language | English |
| Publisher | American Association of Petroleum Geologists (AAPG) |
| Publisher location | Tulsa, OK |
| Contributing office(s) | Central Energy Resources Science Center |
| Description | 6 p. |
| First page | 1448 |
| Last page | 1453 |