Superimposed multiple orders of sequences predict reservoir migration and thickness in stratigraphy trapped Haynesville carbonate reservoirs

Conference · Thu Aug 01 00:00:00 EDT 1991 · Geobyte; (United States)

OSTI ID:5890080

Neuhart, D; Hwang, D ^[1]

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1. Exxon Co. USA, Houston, TX (United States)

The Upper Jurassic Haynesville Formation is part of the Louark group located on the east flank of the East Texas salt basin. Haynesville gas production is from ooid grainstones which formed on a gently dipping carbonate ramp. Hydrocarbon was sourced from the underlying Smackover Formation basinal deposits and trapped stratigraphically by multiple ooid shoal pinch-outs. Therefore, an essential tool in prospecting for Haynesville gas is an understanding of Haynesville stratigraphy. Toward that end, the authors placed the formation into a sequence stratigraphic framework. Haynesville stratal-stacking patterns and lithology distribution result from the superimposition of three orders of cyclicity. Evidence of second order, third order, and fourth order sequences are found within the Haynesville data. The entire Haynesville Formation lies within a second-order transgressive systems tract, which is expresses in facies as an overall deepening event. The superimposition of second-order extreme retrograde deposition during periods of in-phase second- and third- order transgression. The results were large shifts in deposition centers and additional reservoir thickness due to increased accommodation. Fourth -order sequences exerted the greatest control an ooid reservoir distribution due to shoal progradation. By superimposing the observed multiple orders of sequences into the Haynesville geologic model, the top of Haynesville becomes both a sequence boundary in the third order and a maximum flooding surface in the second order. Together, fourth-order flooding surface in the second order. Together, fourth-order and third order sequences indicate the direction of reservoir migration as well as areas of maximum reservoir thickness.

• OSTI ID: 5890080
• Report Number(s): CONF-910978-; CODEN: GEOBE
• Journal Information: Geobyte; (United States), Vol. 75:8; Conference: International conference and exhibition of the American Association of Petroleum Geologists (AAPG): the way ahead-hydrocarbons for the 1990s, London (United Kingdom), 29 Sep - 3 Oct 1991; ISSN 0885-6362
• Country of Publication: United States
• Language: English

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GEOLOGIC FORMATIONS
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