Chemostratigraphic analysis and petrophysical modeling of the Upper Jurassic Haynesville Shale in East Texas and West Louisiana.


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The Haynesville Shale, a Late Jurassic, organic-rich marine shale found in east Texas and west Louisiana, is one of the most heavily developed shale-gas plays in the United States. This study integrates the geochemical data of core samples from three Haynesville wells, the Prescott Family 35 H 1 (API# 1701524594), Woolworth 25 H (API# 1701734753), and Rosborough 1 H (API# 4220334702), with petrophysical well logs and depositional facies to evaluate the controls on productivity and preservation of organic matter in the Haynesville Shale and to predict the most hydrocarbon-rich zones. The three cores were described and sampled to enable the evaluation of paleoceanographic conditions across the northernmost extent of the Haynesville Basin. Furthermore, petrophysical well-logs were compared to geochemical facies for correlative and predictive purpose. Reducing oceanic conditions and high productivity and burial rates all contribute to the preservation of organic-rich source rocks. However, through an integrated analysis of geochemical data, it is possible to conclude that high productivity, which drives high sedimentation and burial rates, results in the most organic matter preservation, rather than the traditional theory that deep water anoxia is the driving mechanism. Additionally, by using the relationship between geochemical character and petrophysical log response it is possible to identify the most organic-rich zones.



Geochemistry. Petroleum.