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Methods and cement compositions are provided for sealing a subterranean zone penetrated by a wellbore, wherein the cement composition comprises zeolite, cementitious material, and a mixing fluid.

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1. A method of sealing a subterranean zone penetrated by a wellbore comprising:mixing a base blend with a mixing fluid to form a cement composition, wherein the base blend comprises at least one cementitious material and at least about 20 weight percent zeolite; placing the cement composition into t

1. A method of sealing a subterranean zone penetrated by a wellbore comprising:mixing a base blend with a mixing fluid to form a cement composition, wherein the base blend comprises at least one cementitious material and at least about 20 weight percent zeolite; placing the cement composition into the subterranean zone; and allowing the cement composition to set therein. 2. The method of claim 1 wherein the zeolite is represented by the formula:Ma/n[(AlO2)a(SiO2)b]·xH2O where M represents one or more cations selected from the group consisting of Na, K, Mg, Ca, Sr, Li, Ba, NH4, CH3NH3, (CH3)3NH, (CH3)4 N, Ga, Ge and P; n represents the cation valence; the ratio of b:a is in a range from greater than or equal to 1 and less than or equal to 5; and x represents the moles of water entrained into the zeolite framework.3. The method of claim 1, wherein the zeolite is selected from the group consisting of analcime, bikitaite, brewsterite, chabazite, clinoptilolite, faujasite, harmotome, heulandite, laumontite, mesolite, natrolite, paulingite, phillipsite, scolecite, stellerite, stilbite, and thomsonite.4. The method of claim 1 wherein the base blend comprises from about 20 to about 50 weight percent zeolite.5. The method of claim 1 wherein the base blend comprises from about 30 to about 90 weight percent zeolite.6. The method of claim 1 wherein the base blend comprises at least about 30 weight percent zeolite.7. The method of claim 1 wherein the base blend comprises from about 50 to about 75 weight percent zeolite.8. The method of claim 1 wherein the base blend comprises at least about 50 weight percent zeolite.9. The method of claim 1 wherein the base blend comprises at least one cementitious material selected from the group consisting of micronized cement, Portland cement, pozzolan cement, gypsum cement, aluminous cement, silica cement, and alkaline cement.10. The method of claim 9 wherein the cement composition further comprises fly ash.11. The method of claim 1 wherein the mixing fluid is present in a range of about 22% to about 200% by weight of the base blend.12. The method of claim 1 wherein the mixing fluid is present in a range of about 40% to about 135% by weight of the base blend.13. The method of claim 1 wherein the cement composition further comprises at least one accelerating additive.14. The method of claim 13 wherein the at least one accelerating additive is selected from the group consisting of sodium sulfate, sodium carbonate, calcium sulfate, calcium carbonate, potassium sulfate, and potassium carbonate.15. The method of claim 14 wherein the cement composition comprises at least two accelerating additives selected from the group consisting of sodium sulfate, sodium carbonate, calcium sulfate, calcium carbonate, potassium sulfate, and potassium carbonate.16. The method of claim 15 wherein at least one accelerating additive is selected from the group consisting of sodium sulfate, calcium sulfate, and potassium sulfate; and at least one accelerating additive is selected from the group consisting of sodium carbonate, calcium carbonate, and potassium carbonate.17. The method of claim 1 wherein the cement composition further comprises:at least one accelerating additive in an amount of about 0.5% to about 10% by weight of the base blend. 18. The method of claim 17 wherein the accelerating additive is present in the base blend in an amount of about 3% to about 7% by weight of the base blend.19. The method of claim 1 wherein the cement composition further comprises a fluid loss control additive selected from the group consisting of anionic water based soluble polymers, hydrophobically modified anionic water based soluble polymers, non-ionic water based soluble polymers and hydrophobically modified non-ionic water based soluble polymers.20. The method of claim 1 wherein the cement composition further comprises a fluid loss control additive selected from the group consisting of hydroxyethylcellulose, hydrophobically modified hydroxyethylcellulose, carboxymethylhydroxyethylcellulose, guar, modified guar, polyvinyl alcohol, montmorillonite clay, anhydrous sodium silicate, grafted polymers prepared by the polymerization of monomers or salts of monomers of N,N-dimethylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid and acrylonitrile having a lignin or lignite or other backbone, and copolymers or salts of copolymers of N,N-dimethylacrylamide (NNDMA) and 2-acrylamido, 2-methyl propane sulfonic acid (AMPS).21. The method of claim 1 wherein the cement composition further comprises:at least one fluid loss control additive in an amount of about 0.5% to about 1.0% by weight of the base blend. 22. The method of claim 1 wherein a flow enhancing agent is absorbed on the zeolite.23. The method of claim 22 wherein the flow enhancing agent is present in an amount of from about 15% to about 25% by weight of the zeolite.24. The method of claim 1 wherein the base blend comprises zeolite in an amount of from about 35% to about 50% by weight, and the cement composition formed has a density up to about 13.5 lb/gal.25. The method of claim 1 wherein the zeolite has a mean particle size of about 100 microns or less.26. The method of claim 1 wherein the zeolite has a mean particle size from about 3 microns to about 15 microns.27. The method of claim 1 further comprising reducing an apparent viscosity of the cement composition with the zeolite.28. The method of claim 1 wherein the mixing fluid comprises water.29. The method of claim 28 wherein the mixing fluid further comprises a defoaming agent.30. The method of claim 28 wherein the mixing fluid further comprises bentonite.31. The method of claim 1 wherein the base blend comprises about 22 weight percent zeolite.32. The method of the claim 1 further comprising preparing the base blend by mixing zeolite in an amount from about 20 to about 50 weight percent with at least one cementitious material.33. The method of claim 1 further comprising preparing the base blend by mixing zeolite in an amount from about 30 to about 90 weight percent with at least one cementitious material.34. The method of claim 1 wherein the base blend comprises at least about 35 weight percent zeolite.35. The method of claim 1 further comprising preparing the base blend by mixing zeolite in an amount from about 50 to about 75 weight percent with at least one cementitious material.36. The method of claim 1 wherein the base blend comprises at least about 40 weight percent zeolite with at least one cementitious material.37. A method of sealing a subterranean zone penetrated by a wellbore comprising:blending a cementitious base with an aqueous zeolite suspension to form a cement composition, which aqueous zeolite suspension causes the cement composition to have a zeolite content of at least about 30 weight percent of the weight of the cementitious base; placing the cement composition into the subterranean zone; and allowing the cement composition to set therein. 38. The method of claim 37 wherein the aqueous zeolite suspension comprises zeolite represented by the formula:Ma/n[(AlO2)a(SiO2)b]·xH2O where M represents one or more cations selected from the group consisting of Na, K, Mg, Ca, Sr, Li, Ba,NH4, CH3NH3, (CH3)3NH, (CH3)4N, Ga, Ge and P; n represents the cation valence; the ratio of b:a is in a range from greater than or equal to I and less than or equal to 5; and x represents the moles of water entrained into the zeolite framework. 39. The method of claim 37, wherein the aqueous zeolite suspension comprises zeolite selected from the group consisting of analcime, bikitaite, brewsterite, chabazite, clinoptilolite, faujasite, harmotome, heulandite, laumontite, mesolite, natrolite, paulingite, phillipsite, scolecite, stellerite, stilbite, and thomsonite.40. The method of claim 37 further comprising mixing zeolite with a mixing fluid to form the aqueous zeolite suspension.41. The method of claim 40 wherein the aqueous zeolite suspension is formed by mixing zeolite in an amount from about 40 to about 50 weight percent with the mixing fluid.42. The method of claim 40 wherein the mixing fluid comprises water.43. The method of claim 40 wherein the aqueous zeolite suspension is stable for at least two weeks before the blending with the cementitious base.44. The method of claim 37 wherein the cementitious base comprises a blend of cementitious material.45. The method of claim 44 wherein the cement composition further comprises hydrated lime.46. The method of claim 37 wherein the blending further comprises blending the aqueous zeolite suspension in an amount of about 1-150% by weight of the cementitious base.47. The method of claim 37 further comprising mixing the aqueous zeolite suspension with a mixing fluid before the blending of the aqueous zeolite suspension with the cementitious base.48. The method of claim 47 wherein the mixing fluid comprises water.49. The method of claim 47 further comprising mixing the cementitious base with a mixing fluid before the blending of the cementitious base with the aqueous zeolite suspension.50. The method of claim 37 further comprising mixing the cementitious base with a mixing fluid before the blending of the cementitious base with the aqueous zeolite suspension.51. The method of claim 37 further comprising adding lightweight materials to the aqueous zeolite suspension prior to the blending of the aqueous zeolite suspension with the cementitious base.52. The method of claim 51 further comprising adding the lightweight materials to the aqueous zeolite suspension in an amount of from about 1% to about 70% by weight of the cementitious base.53. The method of claim 52 further comprisingmixing zeolite with a mixing fluid to form the aqueous zeolite suspension; and adding at least one lightweight material to the aqueous zeolite suspension. 54. The method of claim 53 further comprisingmixing the cementitious base with a mixing fluid prior to the blending of the aqueous zeolite suspension with the cementitious base. 55. The method of claim 54 further comprising blending the aqueous zeolite suspension with the cementitious base to form a cement composition having a density less than about 12 lb/gal.56. The method of claim 37 wherein the aqueous zeolite suspension causes the cement composition to have a zeolite content of at least about 35 weight percent of the weight of the base blend.57. The method of claim 37 wherein the aqueous zeolite suspension causes the cement composition to have a zeolite content of at least about 50 weight percent of the weight of the base blend.58. The method of claim 37 wherein the aqueous zeolite suspension causes the cement composition to have a zeolite content of at least about 67 weight percent of the weight of the base blend.59. The method of claim 37 wherein the blending further comprises blending the aqueous zeolite suspension in an amount of about 130-206% by weight of the base blend.60. A method of sealing a subterranean zone penetrated by a wellbore comprising:mixing a base blend with a mixing fluid to form an unfoamed cement composition, wherein the base blend comprises at least one cementitious material and at least about 20 weight percent zeolite; foaming the unfoamed cement composition to form a foamed cement composition; placing the foamed cement composition into the subterranean zone; and allowing the foamed cement composition to set therein. 61. The method of claim 60 wherein the unfoamed cement composition further comprises bentonite.62. The method of claim 60 wherein the foamed cement composition has a density of at least 8 lb/gal.63. The method of claim 60 wherein the base blend comprises from about 20 to about 40 weight percent zeolite.64. The method of claim 60 further comprising blending the base blend with an aqueous zeolite suspension prior to the foaming.65. The method of claim 64 further comprising forming the aqueous zeolite suspension by mixing zeolite in an amount from about 40 to about 50 weight percent with a mixing fluid.66. The method of claim 64 wherein the foamed cement composition is stabilized by the zeolite in the aqueous zeolite suspension.67. The method of claim 60 wherein the foamed cement composition is stabilized by the zeolite in the base blend.68. The method of claim 60 wherein the base blend comprises at least about 30 weight percent zeolite.69. The method of claim 60 wherein the base blend comprises at least about 40 weight percent zeolite.70. The method of claim 60 wherein the base blend comprises zeolite in an amount of at least 50 weight percent.71. The method of claim 60 wherein the zeolite is selected from the group consisting of analcime, bikitaite, brewsterite, chabazite, clinoptilolite, faujasite, harmotome, heulandite, laumontite, mesolite, natrolite, paulingite, phillipsite, scolecite, stellerite, stilbite, and thomsonite.72. A method of sealing a subterranean zone penetrated by a wellbore comprising:mixing a base blend comprising at least one cementitious material with zeolite in an amount of at least about 15 weight percent of the weight of the base blend to form a cement mix, which zeolite is selected from the group consisting of analcime, bikitaite, brewsterite, chabazite, clinoptilolite, faujasite, harmotome, heulandite, laumontite, mesolite natrolite, paulingite, phillipsite, scolecite, stellerite, stilbite, and thomsonite; mixing the cement mix with a mixing fluid to form a cement composition; placing the cement composition into the subterranean zone; and allowing the cement composition to set therein. 73. The method of claim 72 wherein the base blend is 100 weight percent cementitious material.74. The method of claim 72 wherein the mixing of the base blend with zeolite comprises mixing the base blend with zeolite in an amount of from about 5% to about 25% by weight of the base blend.75. The method of claim 72 wherein the mixing of the base blend with zeolite further comprises mixing a lightweight additive with the base blend and the zeolite.76. The method of claim 72 wherein the mixing of the base blend with zeolite further comprises mixing a dispersant with the base blend and the zeolite.77. A method of sealing a subterranean zone penetrated by a wellbore comprising:mixing a a base blend with an aqueous zeolite suspension and a mixing fluid to form an unfoamed cement composition, wherein the base blend comprises at least one cementitious material and the aqueous zeolite suspension comprises at least about 40 weight percent zeolite; foaming the unfoamed cement composition to form a foamed cement composition; placing the foamed cement composition into the subterranean zone; and allowing the foamed cement composition to set therein. 78. The method of claim 77 wherein the base blend is 100 weight percent cementitious material.79. The method of claim 77 wherein the foamed cement composition is stabilized by the zeolite in the aqueous zeolite suspension.