Formation temperatures determined from stochastic inversion of borehole observations
نویسندگان
چکیده
منابع مشابه
Structure of Sr5Zr3F22 Determined from an Inversion Twinned Crystal
— Synthesized from hydrothermal conditions, Sr5Zr3F22 crystallizes in the orthorhombic symmetry with a = 7.655(1) Å, b = 10.313(1) Å and c = 10.255(1) Å, space group P21212, Z = 2. The structure is determined from 3999 independent reflections including the Friedel opposites and refined up to the residual R1 = 0.036. Inversion twinning is evidenced with a Flack parameter refined to x = 0.377(4)....
متن کاملJoint inversion of borehole electromagnetic and sonic measurements
New-generation electromagnetic (EM) and sonic logging tools are capable of measuring multi-frequency multi-component data at multiple depths of investigation. This allows us to image the formation around the borehole by using an inversion method. A method is developed for directly obtaining porosity and fluid saturation distributions by simultaneously inverting borehole EM and sonic measurement...
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We have employed a few-parameter estimation (FPE) technique to derive information on past surface temperature variations from present-day borehole temperatures. Synthetic experiments show that the FPE t•hnique can separate reasonably well information on century-long trends of surface temperature change from borehole temperatures within a .wide range of noise levels. The technique also allows a ...
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We construct a mid-latitude (30–60 N) reduced temperature-depth profile from a global borehole temperature database compiled for climate reconstruction. This reduced temperature profile is interpreted in terms of past surface ground temperature change and indicates warming on the order of 1C over the past 100 to 200 years. The combination of an initial temperature (the primary free parameter) w...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1990
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1990.tb05572.x