Dulu siapa ya yang bertanya ttg ini ? Kebetulan aku dapet rumusnya di paper yg cukup baru ini (2004). Mudah2an bisa dibaca dengan bener. Kalau masih kesulitan baca nanti ako coba scan, paper printnya sih didepan meja.
RDP ================================== A method for correcting log-derived temperatures in deep wells, calibrated in the Gulf of Mexico *Petroleum Geoscience<http://www.geolsoc.org.uk/template.cfm?name=journals_pg_home_page> A publication of The Geological Society Publishing House<http://www.geolsoc.org.uk/template.cfm?name=geohome> * *Volume 10, Issue 3<http://www.earthscape.org/r2/ES15518/10-3sept04toc.html> September 2004* ------------------------------ * Douglas W. Waples[1]; Jorge Pacheco[2]; Alfredo Vera[2]* Abstract A method for correcting log-derived temperatures in deep wells (3500�C6500 m) has been developed by comparing log temperatures from the Gulf of Campeche (Mexican Gulf of Mexico) with DST temperatures in the same wells. The equations developed in this study are modified slightly from those of Waples & Mahadir Ramly (2001), which were calibrated using data from depths <3500 m in Malaysia. The correction depends strongly on time since end of mud circulation (*TSC*) and, to a much lesser degree, on depth. In this study the true subsurface temperature (Celsius) is given by Ttrue=Tsurf + *f* ・ (Tmeas �C Tsurf) �C 0.001391(Z �C 4498) where *f*=1.32866-0.005289*TSC*, Tsurf is the seafloor or land-surface temperature (°C), Tmeas is the measured log temperature (°C), *TSC* is in hours and Z is depth below seafloor in metres. If *TSC* is unknown, it can be estimated from the trend of TSC with depth. An estimate of the uncertainty in the corrected temperature is obtained from the equation: σ=0.10842-0.029*TSC* where σ is the standard deviation of the correction factor *f*. The uncertainty in the correction factor *f* can be expressed as ±2σ. [1] Consultant, 9299 William Cody Drive, Evergreen, CO 80439, USA, Email: [EMAIL PROTECTED] [2] Pemex Exploración y Producción, Calle 33, No. 90, Col. Burócratas, CP 24160, Ciudad del Carmen, Campeche, México -- --Writer need 10 steps faster than readeR --
