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Porosity is thus the major factor affecting resistivity values. Theory of Resistivity Logging The basic theory relies upon shale resistivity increasing with depth in normally pressured shale as the porosity decreases. An increasing porosity, and thus higher pore water content, is indicative of abnormally pressured shales and will result in lower resistivity. 42 Well Engineering & Construction TOC Previous Next . . . . . ..... PORE PRESSURE Direct Measurements of Pore Pressure A logarithmic plot of shale resistivity vs linear depth is constructed.
T. ESTS ............................................ The term Formation Integrity is one of the most widely misused term in the oil industry. It is usually used to indicate a test to determine the fracture gradient. In reality, the term Formation Integrity Test has a more encompassing meaning which includes: Limit Test: A test carried out to a specified value, always below the fracture gradient of the formation. Leak off Test: A test carried out to the point where the formation leaks off.
Previous Next ..... PORE PRESSURE i) Eaton Method 1. Record the value of the normal trendline dc (dcn) and observe dc (dco) at the depth of interest. NOTE: use only dco values from shales. Do not use any other lithology dc value. 2. Record the overburden gradient from the overburden plot at the depth of interest. 3. 12) the Eaton Method is basically simple if we remember the basic pressure relationship σov = Pf + σmat. 2 to calculate the actual matrix stress. This value of this factor is largely dependent on the degree of undercompaction reflected in the equation by the ratio between the observed dc and the dc value for normally pressured shales at the depth of interest.
Well Engineering and Construction by H. Rabia