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RhoVe Temperature Modeling Methods
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First EAGE Workshop on Pore Pressure Prediction, Mar 2017, cp-506-00025
- ISBN: 978-94-6282-205-4
Abstract
Temperature profiles may be constructed for use in evaluating smectite to illite conversion, or simply applied to a well of interest by utilizing rhob density wireline data, or any continuous velocity-depth profile transformed to density-depth and then porosity. Thermal conductivities of brine & shale matrix (end-members) are input from a transformed continuous density-depth profile, proportional to the porosity or void ratio. In this manner, a variable 1D k-z profile can be constructed from a porosity profile derived from density-depth. Where applicable, thermal conductivities of salt (or other lithologies) can then be inserted into the profile and the local heat flow adjusted to match the span of corrected and uncorrected bottom hole temperatures (BHT) and/or MDT fluid temperatures. The raw BHT can be used as a low-side calibration point and corrections between the raw input and any Horner-type correction, if available, can be used to position the high-side; otherwise, BHT +10% can be used as a reasonable corrected BHT estimate. This method can also be more accurate than temperature estimates derived from a 1D basin model, which typically do not include temporal effects around large salt bodies, but can be included in the variable 1D k-z profile derived from density-depth.