American Oil and Gas Reporter - January 2016 - 49

'Barnett-Style,' High-Rate Fracs
Give New Life
To Liquids-Rich Marble Falls

Vertical Resource Play
By Ulysses "Trey" Hargrove,
Beau Berend, Craig Adams and Will Greathouse

FORT WORTH-The Marble Falls play in North Texas is a highly economic, liquids-rich resource

play that unconventional technology has resurrected from an old, lackluster trend. The reservoir
is a continuous, unassociated hydrocarbon accumulation, and production trends are atypical

of fracture-dominated reservoirs, more closely resembling those of unconventional reservoirs
with high initial rates and protracted hyperbolic declines.

The Fort Worth Basin was historically the venue of small operators chasing small trends,

but Barnett Shale development beginning in the early 2000s transformed it into one of North
America's most active basins. As Barnett activity began dwindling in 2009 with lower natural

gas prices, another resurgence in leasing and drilling activity soon began, this time targeting
a relatively unknown vertical "unconventional" liquids play: the Marble Falls.

More than 3,500 wells had been completed in the Morrowan-age Marble Falls in at least

18 counties prior to 2010. Those wells employed simple completion designs consisting of
selectively perforating narrow zones of higher porosity and stimulating with small volumes of

hydrochloric acid. This resulted in modest estimated ultimate recoveries of 32,000 barrels of

oil equivalent per well. However, applying high-rate slickwater hydraulic fracturing treatments

is allowing Marble Falls wells to achieve average EURs of 150,000-250,000 boe in the core

area. Coupled with low vertical drilling and "Barnett-style" completion costs, these wells can

generate 25-30 percent rates of return even at today's depressed commodity price levels.

JANUARY 2016 49



American Oil and Gas Reporter - January 2016

Table of Contents for the Digital Edition of American Oil and Gas Reporter - January 2016

Contents
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