.. " ... , . THE JOHNS HOPKINS UNIVERSITY

APPLIED PHYSICS LABORATORY LAUREL , MAR YLAND

~ III. STATE FUEL PRODUCT ION (1 9 73)

Type

Coal mines Natural gas (liq.) Natural gas wells Crude oil wells

IV. GEOLOGY

Number

o o o o

(C - 6 )

Un i ts

o thousand tons o thousand bbl o million cu. ft. (j thousand bbl

Trillion Btu

o o

° ° The surface of the basement complex to the north of Wilm­

ington dips to the southeast attaining a maximum onshore depth of approximately 10,000 ft. in the vicinity of Cape Hatteras. Coastal plain sediments , which range in age from Cretaceous to Recent, form a southeasterly thickenin~ wedge that overlies the Precretaceous basement complex. An onshore positive basement structure, trending northwest-southeast, is the dominant struc­tural feature south of Wilmington. This feature, the Cape Fear Arch, is covered by a thin (about 1500 ft.) veneer of sedimentary rocks.

V. RESOURCE DATA

The DOE/DGE sponsored geothermal drilling program drilled eleven 1000 ft. gradient holes in the North Carolina coastal plain. The geothermal gradients varied from 22°C/km to 41 o C/krn (1.2°F/ 100 ft. to 2.2°F/100 ft.). Since the depth to basement is 2000 to 3000 ft. over much of the coastal plain, estimates of tempera- ~ tures at basement are modest, i.e., 30°C to 44°C (86 to 112°F). ~ However for several holes on the mainland, to the west of Cape Hatteras, and where the depth to basement is 4000 to 5000 ft., I temperatures at basement are estimated to be as high as 85°C (l85°F) (3).

VI. GEOTHERMAL ACT IVIES

The geothermal gradient test holes sponsored by the DOE/DGE drilling program have been completed and the results have been assessed by VPI&SU. APL/JHU has conducted and published a study of the energy markets in the northern coastal region of the state (6). APL has forwarded information to a utility (Carolina Power and Light) en the nature and prospects for geothermal energy. ,

VII. LEGAL ACTIVITIES

NCSL may conduct a workshop for state legislature to con­sider geothermal legislation.

NC-2

I I I I

THE JOHNS HOPKI.,S UNIVERSIn'

APPUED PHYSICS LABORATORY LAUREL. MARYL-'.ND

10. Environmental Impact Assessments, Division of Budget Management, 116 W. Jones St., Raleigh, NC 27603, Crys Baggett, Clearinghouse Supervisor, (919) 733-7061.

11. State Coupled Reservoir Assessment Program, VPI&SU, Blacksburg, VA 24061, Prof. John Costain, Geothermal Program, (703) 961-5096.

REFERENCES AND LIST OF SIGNIFICANT REPORTS

(1) P. M. Brown, J. A. Miller, and F. M. Swain, "Structural and Stratigraphic Framework and Spatial Distribution of Permeability of the Atlantic Coastal Plain, North Carolina to New York," U.S.G.S. Professional Paper 796, 1972.

(2) "Evaluation and Targeting of Geothermal ~nergy Resources in the Southeastern United States, Progress Report Oct 1, 1978 - March 30, 1979," VPI&SU, Blacksburg, VA, DOE Report VPI-SU-5948-5.

(3) "Geothermal Resources of the Eastern United States ," Gruy Federal, Inc., Arlington, VA, DOE Report DOE/ET/ 28373-T2.

(4) "Geothermal Energy Market Study in the Atlantic Coastal Plain, Definitions of Markets for Geothermal Energy in the Northern Atlantic Coastal Plain," APL/JHU GEM-002 (QM-80-075), May 1980.

COMMON REFERENCES

(C-l), (C-4), (C-5), (C-6), and (C-7).

NC-4

I

THE JOHNS HOPKINS UNIVERSITY

APPLIED PHYSICS LABORATORY LAUREL . MARVLAND

~ "-

'" /

----

?

13W'" /·19' '\.

0 25 50 I I I , I I

Miles

• Drill hole locations

• Key towns and cities included for reference

Locations of gradient test holes - Eastern North Carolina.

NC-5

I.~!C'. •

n I

W o

HOLE LATITUDE LONGITUDE 8W-T-I-7

SOUTlIPORT. t~. C • Cl~A 33 58.00 77 59.20 -WILHINGTON. N.C. Cl" 3" 12.00 77 53."0

SNEADS FERRY. N.C. C15A 34 31.60 77 27.30

JACKSONVIL~E. N.C. CIS 3~ 39.00 77 19.00

KINSTO~. N.C. C16A 35 15.70 77 35.30'

CHERRY POINT, N.C • . C16 34 5" . 70 76 53.30

BEAUFORT, N.C. C17 34 46.30 76 39.70

ENGLEHARI', N.C. C18 35 31.20 75 59.26

STUHPY POINT, N.C. C19 35 45.12 75 47.65

ELIZABETH CITY. N.C. C20 36 16.81 76 12.58

BELLCROSS, N.C. C21 ' 36 19.59 76 03.54

CREEDS, VA. C22 36 36.38 76 00."3

OCEANA. VA. C23 36 48.09 76 02.62

NORFOLl" VA. C2" 36 57.40 76 16.20

INTERVAL< H)

60-"63

45-390

30-475

50-500

69-217

90-309

"5-302

49-304

53-269 187.1-221.7 1'96.7-205. a 2"8.1-296.3

50-:-313

23-308

89-307

75-296

17-316 152.4-173.3 161.7-174.3 252.8-316.7 303.2-308.5

TABLE C-J.l

GRADIENT SIGHA(REGR. N) ( 'C/KH)

j2 *

29 *

31 *

30 *

23 * 22 *

25 *

36 *

40 * 57.0SiO.77(0.988~ 68)1 60.01i6.71(0.942. 17)2 54.14il.38(0.966? 56)3

31 *

33· *

34 *

38 *

37 * 44.1410.57(0.994. 41)2 49.00jl.64(0.975. 25)2 2~.75jO.0~(1.000,124)1 29.13i2.17(0.957, 10)2

SUFFOLK, VA. C25 3651.0176 ' 29.83 21-307 43"

c.oSTA/N,J.K.) q(..OI/€~J L.!Jf.jQr\cJ, SINf-4A1A.K.), 1~79..295.f3-309.9 26.9510.39(0.996. 23)1

~O~~r E VIIW!+T/ON AND TAlt~eTiNE;. 0'(: 6EOTfiel1.IIIAL ?Ilot:;L€S5 ef.JtER.~'1 R€SouR.c..~S IN rt-lE SOOTH €ASi€K.N ..- 10/ VN(r€~ SlAteS. _ __ _ _ /VPI fS U -5~48.Sf . .

COHO SIOI·IAno

"3.310.19(14) 3.3iO.19(14) 3.910.91(15)

3.4:1:0.45(25) 3.4:iO.4~j(25) 3.710.96(12) 3.7:1:0.96(12)

5.0:1:1.04(2")

Ke-pollr 3/30/79 ,

HEAT FLOW

1.94 1.9iO.l 2.0iO.3 2.1iO.6

1.34 1.5iO.2 1.7:1:0.'3 0.9t.0.2 1.1iO.4

1."" 1."iO.3

ESTlHAl'ED . BI"ISEHEtH SllR~~CE DEPTH TEHPERA . URf ( KIt) ('C)

.465 32

.385 28

.495 31

.505 31

.210 21

.84 36

1.36 51

1.94 91

1.78 95

.95 <44

1.22 55

1.08 SO

.94 49

.557 39

.. .. ,. .... ' -~ .... I:

I I

II I

Bw-T-I-79 ./ 144.

~ M - T-I -79 0./ 21

~ R-T-:I-79 ./ \7

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pR-i- I-79

H,(-I- I -79 J 18

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NH -T-/-70 J 14

0' 1- T -1-79 I S

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353\ 1?-

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3 4 ~9 0 0

3(PU.r: 49

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110 :..?? 32-

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70 12.. 3::;

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