Replies to This Discussion

Permalink Reply by Todd on December 11, 2013 at 12:11am

Check out Page 12

Figure 4. Portions of combined geophysical logs of Metropolitan Industry #1

well, Beaver County, Pennsylvania, showing zones of shale-gas production.

From 2/6/1975 - Shows Gas in Place in the Rhinestreet, Middlesex, and Burket - All in the Upper Devonian

Furthermore -

Black Shale Facies

Three major and three minor black shale facies are recognized in the subsurface

of Pennsylvania. The major units include the Middle Devonian Marcellus

facies of the Hamilton Group, and the Upper Devonian Rhinestreet facies of the

West Falls Formation and Dunkirk facies of the "Canadaway Group". The minor

units are the Burket facies of the Genesee Formation, the Middlesex facies of

the Sonyea Formation, and the Pipe Creek facies of the Java Formation, all Upper

Devonian. These black shale facies in Pennsylvania and their relationship to

the formally recognized units of New York and Ohio are shown in Figure 6.

Permalink Reply by wozzle on December 13, 2013 at 9:40am

That Devonian clastic wedge is pretty impressive; the Rhinestreet alone is up to 175 feet thick in the northeastern Beaver County townships.  The county will be seeing major gas development for decades to come. 

 

 

Permalink Reply by Jason on December 13, 2013 at 9:51am

Wozzle - what about SW beaver county? Hanover Twp and into Hancock county? Same geology?

Permalink Reply by wozzle on December 13, 2013 at 10:21am

Looks to be about 50-100 feet there - still plenty of shale thickness, but I don't know about the organics.  It thins in the southeast part of the county to about 40 feet, if this map is accurate (PA DCNR). 

Permalink Reply by Trapper on December 13, 2013 at 12:24pm

Wozzle how about NW Beaver County/SW Lawrence County?

Permalink Reply by Todd on December 13, 2013 at 12:42pm

Rhinestreet Shale thickens as you go north into Lawrence County.

75-100' thick in SW Beaver County

Attachments:

• West Falls_Net_Feet_Map.pdf, 145 KB

Permalink Reply by wozzle on December 13, 2013 at 12:53pm

Todd, how dare you use the same map I'm using :)

Permalink Reply by wozzle on December 13, 2013 at 12:51pm

About 75-100 in NW BC, thickening to about 175 in SW Lawrence. Remember this is only the Rhinestreet; other shales have decent thicknesses around here, too.  Southern Lawrence is a "bulls-eye" on the isopach maps. Another area in eastern Erie, Crawford and northern Venango counties is everywhere over 100 feet and reaches over 225 feet thick.  I haven't seen any isopachs of shales other than the Rhinestreet, Marcellus and U-PP -yet.

Permalink Reply by Todd on December 13, 2013 at 1:04pm

The legend for the organic black shale cross sections is in the upper right corner of the Cross Section map.

100-150' of total UD thickness for NE, NW and SW Beaver County according to the Upper Devonian Net Feet Map.

Attachments:

• Cross_section_Western PA Upper Devonian Shales.pdf, 240 KB
• Upper_Devonian_Net_Feet_Map.pdf, 160 KB

Permalink Reply by wozzle on December 13, 2013 at 1:17pm

Nice find, Todd.  

Permalink Reply by Todd on December 13, 2013 at 1:38pm

Thanks fozzle wozzle! :)
Do you have any other faults and folds maps of the area?

Permalink Reply by wozzle on December 13, 2013 at 2:03pm

There was one produced  for the U-PP by John Harper of the PA Geological Survey O&G Division (a revision of a previous map) but I can't seem to find it online now. I have a hard copy, and it looks very similar to the one the Ohio folks put together. Folks should remember, however, that with the incredible amount of data coming in for analysis most of the current maps could change significantly, especially those for TOC and other geochemical measurements.  

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