Author: Shirley P. Dutton
Publisher:
ISBN:
Category : Cementation (Petrology)
Languages : en
Pages : 71

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Author: S. P. Dutton
Publisher:
ISBN:
Category : Diagenesis
Languages : en
Pages : 76

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Book Description
Petrographic and geochemical studies were used to determine the diagenetic and burial history of Travis Peak sandstones in East Texas and to relate the diagenesis to permeability variations within the formation. Permeability in much of the formation has been reduced to less than 0.1 md by compaction, cementation and minor pressure solution. Travis peak sandstone is quartzarenite and subarkose, having an average composition Q95F4R1. The first authigenic cements to precipitate were illite, which coated detrital grains with tangentially oriented crystals, and dolomite. Next, extensive quartz cement, averaging 17% of the rock volume in well-sorted sandstone, occluded much of the primary porosity. Quartz is most abundant in the lower Travis Peak, in well-connected sandstone beds that were deposited in braided streams. Dissolution of orthoclase and albitization of plagioclase followed quartz cementation and occurred prior to mid-Cretaceous movement of the Sabine Uplift. Illite, chlorite, and ankerite precipitated after feldspar diagenesis. Oil migrated into Travis Peak reservoirs in the Late Cretaceous from Jurassic source rocks. Later deasphalting of the oil filled much of the remaining porosity in some zones near the top of the formation with reservoir bitumen.

Author: S. P. Dutton
Publisher:
ISBN:
Category : Sandstone
Languages : en
Pages : 170

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Author: Scott Brian Blount
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 354

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Author: Robert J. Finley
Publisher:
ISBN:
Category : Formations (Geology)
Languages : en
Pages : 233

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The Travis Peak (Hosston) formation constitutes a 1,000- to 5,000-ft-thick clastic wedge that formed two major depocenters along the north flank of the Gulf Coast Basin. The depocenters were dominated by fluvial-deltaic facies. A delta-fringe facies, including tidal flat and nearshore shallow-margin shelf facies, formed around the margins of the clastic wedge. These marginal-marine deposits within the upper Travis Peak are the most important productive facies of the formation within a nine-county area in East Texas. Sandstones in the Travis Peak are mineralogically mature. Low permeability and occlusion of porosity is primarily due to quartz overgrowths, authigenic clay, ankerite, and reservoir bitumen, a high-molecular-weight hydrocarbon residue. Within six Travis Peak gas fields in East Texas, porosity ranges from 8 to 11 percent and water saturation ranges from 28 to 44 percent within intervals of net pay. The permeability-thickness product is low in the southern part of the study area and increases toward the north. Upper limits of permeability range from 0.074 md (median value) to 0.084 md (thickness-weighted average), based on well tests that postdate fracture treatment. Within Chapel Hill field, three reservoir sandstone types were defined; sandstones with greatest lateral continuity were deposited as sandy tidal flats, including associated channel sandstones that trend northwest. Lower energy tidal-flat deposition is characterized by increased mud content of sandstones, and low marine transgression resulted in deposition of mudstone and muddy limestone.

Author: Zsay-Shing Lin
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 96

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Author: Stephen Ernest Laubach
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 64

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Author: Brian Douglas Hughes
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 324

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Author:
Publisher:
ISBN:
Category : Oil well logging
Languages : en
Pages : 826

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Author:
Publisher:
ISBN:
Category : Petroleum
Languages : en
Pages : 702

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