Geologic analysis of the Upper Jurassic Cotton Valley Formation in Jefferson TOC) compared to the productive Haynesville Shale Formation (% TOC). Samples of Jurassic Haynesville Formation mudstone are examined with FIB- SEM and Sorry, there is no online preview for this file type. . properties of pore types and networks from a variety of geologic environments. Hydraulic Fracture Design and Well Production Results in the Eagle Ford Shale: . Modeling: A Worked Example From the Haynesville Shale, De Soto Parish.

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As a result of these restrictive conditions, anoxic conditions frequently occurred during the deposition of the sediments that form the Haynesville Shale. Possibly, further alteration of silty, calcareous mudstones has resulted in the formation of the dolomitic mudstones and dolostones. Haynesville and Bossier gas shales are distinctive on wireline logs—high gamma ray, low density, low neutron porosity, high sonic travel time, moderately high resistivity. The Upper Jurassic Kimmeridgian to Lower Tithonian Haynesville and Bossier Shales of East Texas and northwest Louisiana are currently one of the most important shale-gas plays in North America, having high IPs, steep decline rates, EURs estimated at 3 to 7 Bcf per well of each formation, and play resources estimated together in the hundreds of trillions of cubic feet.

The mudstone comprising it accumulated as a widespread and laterally continuous blanket across the limits of this jaynesville basin. The submarine fan sandstones of the Gray sand in north Louisiana are also significant producers. The composition of these mudstones varies haynezville depending on position on geographic location and stratigraphic position.


As a result of rising gas prices and improved technology in hydraulic fracturing and directional drillingit became possible to extract the gas from the Haynesville Shale in an economic and cost-effective manner.

Sandwiched between haynrsville also unconventional Cotton Valley, Bossier and Smackover formations, the Haynesville Shale is one of the most notable plays along the U.

The Haynesville Formation consists of marine and coastal plain limestone, shale, mudstone, and sandstone.

Haynesville Shale

In haaynesville, the Haynesville Shale was thought to be the largest natural gas field in the contiguous 48 states with an estimated trillion cubic feet 7. Northeast Marcellus Shale Utica Shale. Reported prepared under contract no.

Organic matter in the form of amorphous kerogen coats the argillaceous material. The shallow coastal waters were bordered further north by an arid coastal plain characterized by extensive sabkhas.

This sandstone is regarded as having accumulated as submarine fans carrying sediment from the coastline into the basin within which the Haynesville Shale accumulated.

They comprise the foration boundary of the ancient shelf basin within which Haynesville Shale accumulated. In that well, the Haynesville Shale consists of silty, argillaceous mudstones, silty, calcareous mudstones, and dolomitic mudstones and dolostones.

The northern edge of this basin consisted of shallow coastal waters floored by carbonate muds and oolite shoals lying just north of the modern Louisiana – Arkansas border. Jurassic basement blocks, Cretaceous thermal uplifts, and Cenozoic flexure. Bioturbated calcareous mudstone showing abundant calcitic bioclasts in organic-rich matrix.

That makes directional drilling and hydraulic fracturing popular avenues for tapping into its gas reserves. Anoxic bottom water conditions allowed organic matter falling to the floor of this basin filetypw be preserved and incorporated into sediments that became the Haynesville Shale. The silt often occurs as laminations within these mudstones. In January the formation produced 6.


Hettangian Sinemurian Pliensbachian Toarcian. Haynesville and Bossier depositional areas are characterized by different mudrock lithologies.

Haynesville Shale Overview – Maps – Geology – Counties

Ternary diagram showing Bossier and Haynesville mineralogical data from x-ray diffraction analyses. Organic-rich Bossier unlaminated mudstone facies showing fillibranch mollusks and silt-sized siliceous and calcareous grains. Department of Energy, Washington DC.

From Wikipedia, the free encyclopedia. Haynesville mudstones contain abundant carbonate, whereas Bossier mudstones are dominantly clay and quartz, indicating a shift from transgressive carbonate-dominated environment formatioj progradation of clastics due to highstand deposition in the Bossier.

Haynesville samples are from Louisiana and East Texas. Aalenian Bajocian Bathonian Callovian. In addition to the Haynesville Shale, the Haynesville Formation contains two formal subdivisions, which geologists call members.

The western edge of the basin in which the Haynesville Shale accumulated consisted of a broad north-south carbonate platform with prominent oolite shoals. Retrieved from ” https: Recently, Haynesville production of 5. Boulder, Colorado Geological Society of America.