Oil-rich shale, prospective for major resource

100 % Control

TAG controls 100% of the most prospective acreage at accessible depths

12.65 Billion

Undiscovered resource potential of 12.5 billion barrels of oil

50 Degree Oil

The ultra high quality oil the shale formations are generating

Oil Shale

TAG holds a 100% interest in more than 1.5-million acres in the East Coast Basin covering a widespread fractured oil shale prospects. This prospect has been independently estimated to have an undiscovered resource potential in excess of 12.65 billion barrels, calculated on just 20% of TAG-controlled acreage.

The East Coast Basin’s Waipawa Black Shale and Whangai source-rock formations are subject to significant over-pressuring and are generating high quality 50 degree API oil. Furthermore, they are comparable in total organic carbon content oil and gas maturity levels to such successful oil and gas shale plays such as the Bakken of North America’s Williston Basin. See the independent report: Undiscovered Resource Estimate

Shale Formations

Unconventional Shale Formations in the East Coast Basin


Map of East Coast Basin Exploration

Click map to enlarge

Oil-rich East Coast Basin source rocks

These naturally fractured oil and gas shale formations found in the East Coast Basin have long been viewed as a high-quality oil and gas source rocks, though they were never considered to be producible until recent extraction technology success in the U.S. provided a model for successful unconventional oil and gas exploration.

The Waipawa Black Shales are fine-grained sedimentary rocks, usually composed mainly of clay materials that have a high amount of carbonaceous and organic material within the rock’s matrix. They’re the same types of rich hydrocarbon source rock found in the Bakken in North Dakota and Montana, and the Kimmeridge Claystone in the North Sea. Outcrop sampling indicates average total organic carbon (TOC) values of 5% and average Hydrogen Index (HI) of 245, with maximum 12% TOC and 550 HI, respectively. The formation occurs throughout TAG Oil’s East Coast Basin acreage.

The Whangai Formation is 300 to 600m thick throughout much of the onshore East Coast Basin with maximum 1.7% TOC and 336 HI. Although its TOC content is lower than the Waipawa, the Whangai Formation has been geochemically linked to many onshore oil and gas seeps, validating its potential as an unconventional reservoir. In addition, the Formation is heavily fractured, providing both increased reserve potential as well as natural pathways to enhance flow rates. The fact that the Formation is typically some twenty times thicker than the overlying Waipawa formation adds immensely to the potential of its overall oil and gas generation.

Unit Bakken Waipawa Whangai
Depth (m) 2700 – 3500 0 – 5000 0 – 5000
Net Thick (m) 10 – 50 10 – 60 300 – 600+
Primary Perm (microdarcies) 40 – 50 10 – 200 10 – 110
Tmax (C) 420 – 450 430 – 445 420 – 445
TOC % 1.1 – 12 3.0 – 12 0.2 – 1.7
Quartz Content % 20 – 68 40 – 80 40 – 80
Vit Refi R 0.3 – 1.2 0.3 – 0.4 0.4 -1.4
Total Porosity % 8 – 12 9 – 23 16 – 31
Source Rock / Oil Gravity (API) Type II/42 Type II/50 Type II/50
Icon - Shallow

Years of low-risk drilling opportunity in lightly explored discovery acreage.

Icon - Deep

Deeper Oligocene and Eocene strata with high-impact reserve potential.

Icon - Offshore

The last remaining pearl in the prolific Taranaki Basin production fairway.