If pressure, temperature, and chemical composition (PTX) are known, any thermodynamic property of a subsurface brine can be calculated, at least in theory. If in addition to PTX, spatial position can be defined, then the mechanical energy available to drive fluid flow can be calculated. In this chapter we will discuss the pressure and temperature of subsurface fluids and how these physical parameters can be measured or calculated. We will then look at a number of other physical parameters which can be readily derived if PTX is known.
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The topics covered in these notes have been selected to provide the general sedimentary geologist with an introduction to some of the key problems and a conversational familiarity with some of the basic techniques in this important area of sedimentary geology. A number of field examples are drawn from the Louisiana Gulf Coast, buy many of the general principles will be applicable to other areas and problems.