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In the ratio method, pore pressure is calculated using the assumption that, for sonic delta-t, density, and resistivity, respectively, the pore pressure is the product of the normal pressure multiplied (or divided by) the ratio of the measured value to the normal value for the same depth.
Pore Pressure. Pore pressure is the pressure exerted by the fluids within a rock’s pore space. Pore pressure can be calculated via a variety of methods from either well logs or seismic velocities. The gradient is called PPG or pore pressure gradient.
The standard method for measuring pore water pressure below the water table employs a piezometer, which measures the height to which a column of the liquid rises against gravity; i.e., the static pressure (or piezometric head) of groundwater at a specific depth. [6]
This video explains a step-by-step procedure used to calculate the pore water pressure from a flow net sketch.
The basic steps in performing a conventional 1-D pore pressure analysis are: Calculate total vertical stress (S v) from rock density ; Estimate effective vertical stress (σ e) from log measurements or seismic (LWD-WL, Vel) Pore pressure P f = S v – σ e
Pore pressure. Pore pressure is the pressure at which the fluid contained within the pore space of a rock is maintained at depth. In the absence of any other processes, the pore pressure is simply equal to the weight of the overlying fluid, in the same way that the total vertical stress is equal to the weight of the overlying fluid and rock ...
Pore pressure is the pressure of fluids in the pore space of rock. For subsurface fluid flow and fluid potential, pore pressure is the most important variable, and pressure conditions can be a result of either local, regional or even basin-scale dynamic processes.
Pore pressure analyses include three aspects: pre-drill pore pressure prediction, pore pressure prediction while drilling and post-well pore pressure analysis. The pre-drill pore pressure can be predicted by using the seismic interval velocity data in the planned well location as well as using geological, well logging and drilling data in the ...
3.1 Introduction. This chapter mainly deals with the basic aspects required for pore pressure understanding/calculations starting from normal pressure to abnormal pressure scenarios. The estimation of pore pressure is important for well planning.
This guide explains what pore water pressure is, the formula used to calculate pore pressure, and its role in determining the structural integrity of earthworks. It also outlines how drainage helps to maintain pore water pressure and effective stress, preventing structures from collapsing. Read on to learn more about: What is pore water pressure?