California's Kreyenhagen elevated to primary target

By OGJ editors
HOUSTON, July 27
-- Zodiac Exploration Inc., Calgary, has upgraded the Eocene Kreyenhagen formation to a primary objective based on further analysis of engineering and geological data from its 4-9 vertical test well in Kings County, Calif.

As previously reported, following a 24-ton frac stimulation over a 30-ft siltstone interval in the Kreyenhagen formation, the 4-9 well averaged a flow of 24 b/d of 29° gravity oil for 9 days before being shut-in for pressure build-up.

The pressure test analysis indicated significant skin (formation) damage of approximately +13, which the company believes can be addressed by optimizing stimulation procedures in future wells. The Inflow Performance Relationship (IPR) derived from the well test analysis demonstrated that a rate of 120 b/d could potentially be achieved with 60% pressure drawdown and elimination of formation damage.

The reservoir is overpressured with 12,800 psi reservoir pressure and a gradient of 0.9 psi/ft. Porosity and permeability values derived from well log analysis indicate effective siltstone porosity of 10-13% with permeability of 0.4-3.0 md.

Murray Rodgers, Zodiac president and chief executive officer, said, “To put these results into perspective, this test rate was generated from the stimulation of a 30-ft siltstone interval, while we have identified a total of 150 ft of siltstone in this formation in the 4-9 wellbore. It is significant that our geoscience team has also identified up to 500 ft of siltstone on other portions of company acreage.

“We have now demonstrated that we can successfully place a hydraulic fracture into the Kreyenhagen siltstone which greatly enhances our ability to access the existing natural fractures present in the reservoir. As we improve our completion techniques, an increase in production performance can be achieved. We believe we have identified a major light oil resource play; however, additional testing and evaluation will be required to confirm the potential of the Kreyenhagen formation.”

The shales of the Kreyenhagen formation in the 4-9 well exhibit specific geological characteristics similar to and in some cases superior to other successful source rock plays in North America, Zodiac noted. Extensive analysis of well logs, drill cuttings, and core data indicate high oil-prone total organic carbon of up to 5.75% and sufficient maturity to assist in confirming the company’s view that the Kreyenhagen shales are presently generating oil on company lands.

The analysis indicates high shale porosity and permeability, averaging 5.7% and .06 md, respectively. A pervasive natural fracture system that may enhance these reservoir parameters has also been identified.

Substantial gross formation thickness including both siltstones and shales range from 800 to more than 1,000 ft across company lands. While not expected to be prospective on all of the company’s lands, the Kreyenhagen formation is present on the entire 86,000 net acres controlled by the company. For comparison, net siltstone reservoir thicknesses in the Bakken formation in North Dakota and Saskatchewan is 20-30 ft on average.

The company also announces that in addition to the ongoing completion and testing program for the 4-9 well, Zodiac’s 1-10 appraisal well has reached a total depth of 13,515 ft and the company is preparing to set intermediate casing. The 1-10 well reached this depth in 36 days versus 57 days to a similar depth in the 4-9 well.

The 1-10 well is 1 mile east of the 4-9 well and is planned as the company’s first horizontal well. The 4-9 well test results, combined with geological and geophysical data gathered to date, will determine the placement of the horizontal leg in the 1-10 well.

A large independent oil and gas producer has elected to participate in the drilling of the 1-10 well with a 20% working interest. Results of the Lower Vaqueros completion in the 4-9 well are still being analyzed, and Zodiac expects to begin testing the Oligocene Whepley formation in early August.

Related Articles

EIA: US shale oil production to fall 91,000 b/d in August

07/13/2015 Crude oil production in August from seven major US shale plays is expected to decline 91,000 b/d to 5.36 million b/d, according to the US Energy In...

BHI: US rig count continues upward creep

07/10/2015 Although the overall US drilling rig count only edged up 1 unit to 863 rigs working during the week ended July 10, it represented the third consecu...

BHI: US oil rig count rises for first time in 30 weeks

07/02/2015 A sudden 12-unit jump in oil-directed rigs during the abbreviated week ended July 2 represented their first rise since Dec. 5, 2014, and helped lif...

BHI: US rig count posts first increase in 29 weeks

06/26/2015 Buoyed by respective rises in natural gas-directed and offshore rigs, the US drilling rig count gained 2 units during the week ended June 26 to rea...

Hess, GIP form Bakken midstream joint venture in $2.675-billion deal

06/22/2015 Global Infrastructure Partners (GIP), an independent infrastructure fund manager, has agreed to acquire 50% interest in Bakken shale midstream asse...

Whiting reports high IP rates from Bakken, Three Forks

06/12/2015 Whiting Petroleum Corp. reported some of industry's top initial production rates from both the Bakken and Three Forks formations in the Willison ba...

RJA: US rig count recovery will be led by three core unconventional plays

06/12/2015 Raymond James & Associates revised its US rig count forecast, noting it expects a 2016 recovery will be disproportionately weighed toward horiz...

Statoil lets carbon dioxide contract for Bakken pilot

06/12/2015 Statoil has let a major carbon dioxide supply and service agreement to Ferus LP of Denver to supply liquid CO2 to be used in a test well to evaluat...

Statoil focused on improving completions and doing tests during low-drilling period

06/11/2015 Statoil ASA plans to use what one executive calls "low-activity time" to work on completion designs and to enhance recovery in its unconv...
White Papers

UAS Integration for Infrastructure: More than Just Flying

Oil and gas companies recognize the benefits that the use of drones or unmanned aerial systems (UAS) c...

Solutions to Financial Distress Resulting from a Weak Oil and Gas Price Environment

The oil and gas industry is in the midst of a prolonged worldwide downturn in commodity prices. While ...
Sponsored by

2015 Global Engineering Information Management Solutions Competitive Strategy Innovation and Leadership Award

The Frost & Sullivan Best Practices Awards recognise companies in a variety of regional and global...
Sponsored by

Three Tips to Improve Safety in the Oil Field

Working oil fields will always be tough work with inherent risks. There’s no getting around that. Ther...
Sponsored by

Pipeline Integrity: Best Practices to Prevent, Detect, and Mitigate Commodity Releases

Commodity releases can have catastrophic consequences, so ensuring pipeline integrity is crucial for p...
Sponsored by

AVEVA’s Digital Asset Approach - Defining a new era of collaboration in capital projects and asset operations

There is constant, intensive change in the capital projects and asset life cycle management. New chall...
Sponsored by

Transforming the Oil and Gas Industry with EPPM

With budgets in the billions, timelines spanning years, and life cycles extending over decades, oil an...
Sponsored by

Asset Decommissioning in Oil & Gas: Transforming Business

Asset intensive organizations like Oil and Gas have their own industry specific challenges when it com...
Sponsored by
Available Webcasts

Operating a Sustainable Oil & Gas Supply Chain in North America

When Tue, Oct 20, 2015

Short lead times and unpredictable conditions in the Oil & Gas industry can create costly challenges in supply chains. By implementing a LEAN culture of continuous improvement you can eliminate waste, increase productivity and gain end-to-end visibility leading to a sustainable and well-oiled supply chain.

Please join us for this webcast sponsored by Ryder System, Inc.


On Demand

Leveraging technology to improve safety & reliability

Tue, Sep 22, 2015

Attend this informative webinar to learn more about how to leverage technology to meet the new OSHA standards and protect your employees from the hazards of arc flash explosions.


The Resilient Oilfield in the Internet of Things World

Tue, Sep 22, 2015

As we hear about the hype surrounding the Internet of Things, the oil and gas industry is questioning what is different than what is already being done. What is new?  Using sensors and connecting devices is nothing new to our mode of business and in many ways the industry exemplifies many principles of an industrial internet of things. How does the Internet of Things impact the oil and gas industry?

Prolific instrumentation and automation digitized the industry and has changed the approach to business models calling for a systems led approach.  Resilient Systems have the ability to adapt to changing circumstances while maintaining their central purpose.  A resilient system, such as Maximo, allows an asset intensive organization to leverage connected devices by merging real-time asset information with other critical asset information and using that information to create a more agile organization.  

Join this webcast, sponsored by IBM, to learn how about Internet of Things capabilities and resilient systems are impacting the landscape of the oil and gas industry.


Taking the Headache out of Fuel License and Exemption Certificates: How to Ensure Compliance

Tue, Aug 25, 2015

This webinar, brought to you by Avalara, will detail the challenges of tax document management, as well as recommend solutions for fuel suppliers. You will learn:

-    Why it’s critical to track business partner licenses and exemption documents
-    The four key business challenges of ensuring tax compliance through document management
-    Best practice business processes to minimize exposure to tax errors


Emerson Micro Motion Videos

Careers at TOTAL

Careers at TOTAL - Videos

More than 600 job openings are now online, watch videos and learn more!


Click Here to Watch

Other Oil & Gas Industry Jobs

Search More Job Listings >>
Stay Connected