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An injection backflow method for measuring fracture surface area adjacent to a wellbore measures an initial temperature profile along the length of a wellbore. A tracer composition is injected into the wellbore at an initial concentration. The tracer composition includes a reactive tracer and a seco

An injection backflow method for measuring fracture surface area adjacent to a wellbore measures an initial temperature profile along the length of a wellbore. A tracer composition is injected into the wellbore at an initial concentration. The tracer composition includes a reactive tracer and a secondary tracer that is less reactive than the reactive tracer. The tracer composition diffuses within subterranean reservoir for a time. A secondary tracer concentration and a reactive tracer concentration are measured as a function of time. A reservoir fracture surface area is calculated using a reservoir fluid flow model.

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1. A method, comprising: measuring an initial temperature profile along the length of a wellbore;injecting a tracer composition into the wellbore at an initial concentration, wherein the tracer composition includes a first thermally reactive tracer and a second thermally reactive tracer, wherein the

1. A method, comprising: measuring an initial temperature profile along the length of a wellbore;injecting a tracer composition into the wellbore at an initial concentration, wherein the tracer composition includes a first thermally reactive tracer and a second thermally reactive tracer, wherein the second thermally reactive tracer is less thermally reactive than the first thermally reactive tracer;allowing the tracer composition to diffuse within a subterranean reservoir for a time;measuring a second tracer concentration of the second thermally reactive tracer and a first tracer concentration of the first thermally reactive tracer as a function of time; andcalculating a reservoir fracture surface area using the second tracer concentration and the first tracer concentration and thermal decay information of the first thermally reactive tracer and the second thermally reactive tracer. 2. The method of claim 1, further comprising fracturing a subterranean reservoir adjacent the wellbore prior to or during the injecting of the tracer composition. 3. The method of claim 1, wherein the second thermally reactive tracer is a conservative tracer. 4. The method of claim 3, wherein the second thermally reactive tracer is selected from the group consisting of deuterated water, alkali metals, alkaline-earth metals, halides, and combinations thereof. 5. The method of claim 3, wherein the second thermally reactive tracer is 2,6-naphthalene disulfonate. 6. The method of claim 1, wherein the first thermally reactive tracer is selected from the group consisting of esters, amines, aryl halides, rhodamine WT, eosin Y, dyes, halogenated fluoresceins, and combinations thereof. 7. The method of claim 1, wherein the initial concentration of the first thermally reactive tracer or the initial concentration of the second thermally reactive tracer is from about 0.1 ppb to about 100 ppb. 8. The method of claim 1, further comprising shutting-in the wellbore when allowing the tracer composition to diffuse for an extended shut-in time. 9. The method of claim 8, wherein the extended shut-in time is from about 6 hours to about 4 days. 10. The method of claim 1, wherein the time is from ten minutes to 4 hours. 11. The method of claim 1, further comprising stimulating a subterranean reservoir adjacent the wellbore to increase the reservoir fracture surface area, and wherein the injecting the tracer composition occurs when stimulating the subterranean reservoir, and wherein the measuring the second tracer concentration occurs during a backflow of fluid from the subterranean reservoir. 12. The method of claim 1, wherein the measuring the second tracer concentration uses liquid chromatography, spectrofluorimetry, filter fluorimetry, or absorption spectroscopy. 13. The method of claim 1, wherein the measuring the secondary tracer concentration occurs at a wellhead of the wellbore. 14. The method of claim 1, wherein the calculating the reservoir fracture surface area comprises applying an inversion technique to the thermal decay model of the first thermally reactive tracer to calculate the reservoir fracture surface area. 15. The method of claim 1, wherein the reservoir fluid flow model is run in a numerical simulation program. 16. The method of claim 1, wherein the reservoir fluid flow model includes an estimate of an original reservoir temperature. 17. The method of claim 1, further comprising shutting-in the wellbore subsequent to the injecting the tracer composition and prior to measuring the secondary tracer concentration. 18. The method of claim 1, wherein a subterranean reservoir adjacent the wellbore is a geothermal reservoir, gas reservoir, oil reservoir, or combination thereof.