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Home My WebLink AboutGMC Data Report No. 357Thin Section and Scanning Electron Microscopy summary photographs from plugs taken from core of the Union Oil Company of California Trading Bay Unit M-29 (11,481.1'-11,511.0'), along with photographs of the original core (Marathon Collection at the Alaska GMC) before and after the- plugging .. Received November 2008 Total of 36 pages in report (have data CD) Alaska Geologic Materials Center Data Report No. 357 M-29: 11,481.1 ft ,. ~ ' .:. ~~ ' 1 1~.•,. ~ Y 1 ~ K' ~. i, ,f. ~ • ~ ~, S $" , ~- }~ _ ~ ~ • ~, ' ~ 250 microns ,~ G~IiC DATA REPORT 3 5 7 Strongly compacted, very poorly sorted, medium-grained, carbonaceous, fossiliferous, feldspathic-lithic (VRF) sandstone with abundant pseudomatrix, authigenic chlorites (cements &replacive) &replacive zeolites. Intercrystalline micropores -common. Effective porosity is lacking. Page 1/36 ~ _ ~,~ ,~" i~ - r ~ ~... y ~ ~, 5$ ~ ~ ,~ ~ r "~ ~ ~~ a {,~ ; ~ + { r ` .. sir ~ r .,g' . 1...777°°°°:---~5~~~~,,M~~~T~`~ ~~~ ~ .s ; .r. - t~" „- ".. ~^ :.fir ~" 500 microns M-29: 11,482.6 ft Strongly compacted, poorly sorted, fine- grained, fossiliferous, feldspathic-lithic (VRF) sandstone with abundant pseudomatrix, microstylolites & authigenic (replacive) chlorite & zeolites. Inter-crystalline microporosity - common. Effective porosity is absent. Page 2/36 GN~C DATA REPORT 3 5 7 M-29: 11,483.5 ft GMC DATA REPGRT 3 5 7 Strongly compacted, very poorly sorted, medium- to coarse- grained, fossiliferous, feldspathic-lithic (VRF) sandstone with abundant pseudomatrix, authigenic chlorite (cements &replacive) &replacive zeolites. Effective porosity is lacking. Page 3/36 M-29: 11,483.9 ft ,_. ~ ~ ~.: ~ A `yi. M 1 + ~ Y ~ • R b ~ J V t.~YlC 2 pr ~ ~ JF ~ '~ 4 ~ ~ yn ~ ,. ~ ~ w _ -. ~ ~ € ~ ~ . t ~ ~ ~t 1` r H `. ` ,# ti ~ - ~ . +,* ' r 3 ~ ,,. i~Y fi nR y - ... ~,4~_ 5 ~ . j ' ry r ' ~ -. - p5 L ~k i.. ~ 4 f . s e !kr _ ^,:v ' t ~. ~ ' 3+°~~r `~ ~ r . ~ ~ j ~ d ~ ~ . .E.. ~ ' r ~ r ~ ~,~, 250 microns GN~C DATA REPORT 3 5 7 Strongly compacted, moderately sorted, fine- to medium-grained, very fossiliferous, feldspathic- lithic (VRF) sandstone with pseudomatrix, authigenic chlorites (cements &replacive) & replacive zeolites. Micro-sutured grain contacts abundant. Intercrystalline micropores - common. Effective porosity is absent. Page 4/36 M-29: 11,485.1 ft ~~~ _ .r: ~ ~.' ~ ~~ ~• ~M;. ~~_ ~, ~. ~ 1' x • ~ rt~ ,.~ .ti J .,p- ... e T a r.s ~ !.. ... ~ ~` a. ~ ~.~ ' .y d `±~ lt i~'Ji . s v Y ~... ¢ Y „~ ~. ~3 C ~t ~ ~1. ''i ' 1, `1*~ _~, ` r _~ N » , ~,. v ai r ~ _ _~ . , `"`~ ~' } 250 microns ~ ,; ~. Strongly compacted, moderately sorted, fine- to medium-grained, fossiliferous, feldspathic-lithic (VRF) sandstone with abundant authigenic chlorites (cements & replacements) & replacive zeolites. Intercrystalline micropores, isolated grain molds & cemented microfractures -present. Effective porosity is lacking. GMC DATA REPOT ? 5 7 Page 5/ 3 6 M 29: 11,486.3 ft Strongly compacted, very poorly sorted, medium- grained, fossiliferous, feldspathic-lithic (VRF) sandstone with abundant pseudomatrix, authigenic chlorite (cements & replacive), other clay minerals & replacive zeolites. Intercrystalline micro-porosity -common. Effective porosity absent. 9' ~ .pr '; 1 ^;. a ff~~(( - ~ - ~~ Y y~ Ri,t'l~ t. b i ~ a ~~~',", ~ `; ... }~' ~~ GPJIC DATA REPQRT 3 5 7 Page 6/ 3 6 M-29: 11,488.1 ft Strongly compacted, moderately sorted, medium- grained, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites, chlorite & calcite. Intercrystalline micropores (abundant); isolated grain molds & cemented microfractures- present. Effective pore network is lacking. t s -- ~ .s'a" '..~ , s•' ~, ~' f 1 ~ ..r 1~ ~ ~ ~bMi ~ 4. r d - d w ~ ~ ~ e , . ~ ~ v ~, .~.. ~ _.;711 y~' .~;'~ ~, ~ 4 q~ ~ t' 1 2JO ~ , a. ; \: ~ h Gi~G DAT~- REPGRT 3 5 ~ Page 7/36 M-29: 11,489.5 ft AMC QATA REPORT ' 5 7 Strongly compacted, poorly sorted, fine- to medium-grained, feldspathic-lithic (VRF) sandstone with abundant authigenic chlorite (cements & replacements) & replacive zeolites. Hematite replacement is pervasive. Microstylolitic grain contacts abundant. Intercrystalline microporosity -scattered. Effective porosity is absent. Page 8/36 M-29: 11,490.5 ft Moderately compacted, moderately sorted, medium-grained, chlorite cemented, feldspathic- lithic (VRF) sandstone with pervasive replacement by zeolites, clays & calcite. Intercrystalline micropores -abundant & chlorite-cemented microfractures evident. Effective porosity absent. :F~ti ~4r ~~~~ r R,~ -i 250 microns 1'„ ' ' ^a i. ~ 5 *{ !'K ~A ~~ l u ' \ rya 2a . efcF~W 4 r~~}.' z s-~~ 4 .. ,. ti ( ~.v b~. y, ~~ CMC DATA REPORT 3 5 7 Page 9/ 3 6 M-29: 11,491.2 ft Strongly compacted, moderately sorted, fine- grained, feldspathic-lithic (VRF) sandstone. Chlorite cemented with abundant microstylolitic fabrics & pervasive replacement by clay minerals & zeolites (mainly laumontite). Intercrystalline microporosity -common. Effective porosity is lacking. Page 10/36 GMC DATA REPORT 3 5 7 M-29: 11,492.4 ft 500 microns , ,~ ~_# 1 `~~i ~.~ ~~ Open r, t ~ ~ -~"»~ - , ~ ~ fracture • ; ' v . ,~, war "~ y+ ~ a ~q'` o- Z '~ ~ j ~1y y ~.~ x yh~ ~ Y ~°'• ham- ';~ 4 9`. ~ '~~`' " ~. . J 4 ' Y'9+ 'w ~ ~ S t, ' Y, ^ r ~ ` ,~ ~~~~~ ~ ' ~ y ~ ~ , ~ ~ A ! , } ~r~ 3 . ~ Jy1l k ? ' ~ Ts ~"~' ~ Rt3 ~ ~ , '~ : a ~ , ~ t~ ~'y 44. ~" `~ + ~'~~+'v'"9 ~ ~,.. A' .d~. , •y, w~ ~ , ~ ~ +~' -"~''"' ~~" ~ 250 microns , r ~~~.. nr,-~~, kF~O~T 3 5 7 Strongly compacted, moderately well sorted, very fine-grained, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites, chlorite & calcite. Intercrystalline microporosity (abundant); vertical open & chlorite- cemented microfractures associated with stylolites. Dissolution is evident along margins of fractures. Effective porosity limited to fractures. S~ [+~~'€ r~ :,,~ Yy 1 •~ .~ J Page 11/36 M-29: 11,493.3 ft Densely compacted, poorly sorted, medium- grained, fossiliferous, chlorite-cemented feldspathic-lithic (VRF) sandstone with pseudomatrix, authigenic clays (cements & replacements) & zeolites. Microstylolitic grain contacts well developed. Intercrystalline micropores & open, sub-horizontal microfractures present. Effective porosity restricted to fractures. GMC DATA REPORT 3 5 7 Page 12 a/ 3 6 M-29 : 11,495.8 ft Moderately compacted, moderately sorted, medium-grained, fossiliferous, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites & clay minerals. Intercrystalline micropores - abundant &chlorite-cemented micro- fractures- present. Effective porosity absent. Y ~ f,, i kf 1, n~1.~ `j~Y ~ . ' C " & f a~ ~ '~Y ~ r• ~ ~ FFF ~~ . e .. 1t r . ~ ~ y~ ` y ,~A ~ >~ ~ 4i ~_ y ~ •+• '~~~ w ~ \ k ~. , , ~ ~~ w ?~ ,.y 3-~ a 250 GMC DATA REPORT 3 5 7 Page 12b/36 M-29:11,496.5 ft Moderately compacted, poorly sorted, medium- grained, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites, chlorite & calcite. Intercrystalline micropores - abundant; grain molds -scattered. Hematite replacement -common. No effective porosity. ~. _ . _ ~ ~ ~ -. , ., ..~ °. _ ,. ~ .4 ~,. ~ ~ z~, ~ ~. Chlorite ~~ ~~ ~ ~ ~~ `" '`'' ~ ~ cement F u: ~ • ~ ~Y ~ is , S~ti. , y ,• ~ •- + ~A R~ , Y t ~a ~ii ~ t~6' . ~4 ~; f ~ia r ~ Y', ,~~. .9 ~ .• ~g„t " 250 microns ".. 6MC DATA REPORT 3 5 7 Page 13/ 36 M-29: 11,497.8 ft Moderately compacted, poorly sorted, fine- to medium-grained, feldspathic-lithic (VRF) sandstone with abundant chlorite cements with replacive zeolites & clays. Microstylolitic grain contacts developed on larger grains. Intercrystalline microporosity -common. Effective porosity is absent. GMC DATA REPORT 3 5 ~ Page 14/36 M-29:11,498.3 ft 6MC DATA REPORT 3 5 7 Pervasively microstylolitized, poorly sorted, fine- grained, carbonaceous, fossiliferous, lithic- feldspathic sandstone with pseudomatrix, chlorite cements & replacive zeolites. Intercrystalline microporosity -abundant. No effective porosity. i ±~ ~ P` e y _ ~ ~' ~{7y '~,' ._ ~ ~ ~ =~S `~~ °`4'~` " `'' ~c.~ :;ins ~ ~ ~:. ~y S ,~,~ ~ ~ /f,~b"r F rw~iiS~ r~ -.4a'~,':.5 t r.~~J Pt `.i. roS ~1.1::i. e ~qa ~ ,~ ~ l `~ ~v5 V ~~ 4 n` f t!j. " ~ +~16~ ? <' .s'ao, ' v~ ~3.'y.,. bit Ffl _ a~ ~~~~ x f~ ~ `~ '~: aF. s .,- . - ~~ Page 15/36 M-29: 11,498.8 ft Pervasively microstylolitized, poorly sorted, medium-grained, carbonaceous, fossiliferous, feldspathic sandstone with scattered pseudo-matrix, authigenic chlorite cements & replacive zeolites. Intercrystalline microporosity -abundant. Sample transected by open, horizontal to oblique microfractures. Effective porosity restricted to fracture network. F GMC GATA REPORT 3 5 7 Page 16/36 M-29: 11,500.7 ft Moderately compacted, moderately well sorted, medium-grained, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites & clay minerals. Intercrystalline micropores - abundant &chlorite-cemented micro- fractures- evident. Effective porosity absent. Y .~~i'` j~ .~~ 7 akni.-: i as +a. _ ~f,: r,3r l3 i~ t~iiT~ a `,y j t ~ + i ,~j"+ YL ~ .u? ~ s '%•,, _ .. ~ .~~ GiUiC GATA REPORT 3 5 7 Page 17/36 M-29 : 11,501.8 ft Moderately compacted, moderately sorted, medium-grained, fossiliferous, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites & clay minerals. Intercrystalline micropores - abundant. Effective porosity lacking. GiU~t; ur1 ~ ~~ I~tFGi~T ~ ~ 7 Page 18 / 3 6 M-29 : 11,502.5 ft Densely compacted, moderately sorted, medium- grained, fossiliferous, chlorite-cemented, feldspathic-lithic (VRF) sandstone. Well- developed microstylolitic fabrics & pervasive replacement by zeolites, & clay minerals. Authigenic hematite concentrated along stylolites. Intercrystalline microporosity - scattered. Effective porosity is lacking. `jolt ~ . r • ~ c{r ~^ P . r :/k~: t~ q !.Y ~ (~ .., hi sE , ~ _ ';, 250 microns ~~~,' G~l~ GATA REt ORT 3 5 7 a ; F f mm d ~ ? ~. 1'„. ~~ -Y.~.' qqx ~ Y x.:,43-~ Y.=`~ '~ ,a-~"'* t`~ ::~~ l f'~ ~ l J~ Y Fg~~z ~ f , r ~``~ t" 4 l `~~, ~,, *~ a g 1 '~~ . ~a ( ~ ~i4Ha11~ J Jts~~, 1 ,~~ ~ t ~,~, `~ SS ~tf ,, ~ -.i t ~ ;~j .:.~ } ~~1~.,i~!~sS{ ~i9 4+° f' j ~ i J'~ y^ +k~''~1 ~~ S .~ °~~~ ¢ f£ i ~iy~ ` a `~~' ~ l a ~ , ~ t ~{' }~~\ Page 19/36 ' ~ d M ~ f tt -JN yt r _ Y ~ r ! ~~ .~ ur ~~,,,. j F. 5 ~ k}~ V ~ ~ 'rr't r~~'i~~ 1 ~ ;s "~ ~ ~: '~ r ~- ~_> ~ may,,, ~ f" ° _ ~ ,~. ^~a :. , f .~ x ~~sy, , ~ A'1 ~'.-t., -+~ l 1, .~4 < ~ ~ ~,, :. . `~ ~~, ~ '~ ,:, +~ ' ~ ~ ~ 500 microns ,Y ~ GMC DATA REPORT 3 5 7 M-29: 11,503.3 ft Moderately compacted, moderately well sorted, fine-grained, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites & clay minerals. Microstylolitic fabrics developed locally. Intercrystalline micropores & laumontite cemented microfractures present. No effective porosity. Page 20/36 ~-. x. 6MC DATA REPORT 3 5 7 M-29: 11,505.5 ft Moderately compacted, moderately well sorted, fine-grained, chlorite cemented, feldspathic-lithic (VRF) sandstone with pseudomatrix & pervasive replacement by zeolites & clay minerals. Intercrystalline micropores & laumontite cemented microfractures present. Effective pore network absent. Page 21/36 '~ _ '~~ 500 microns -~~,,, ,_ ~ ti v • ~ } ~~ , s ~ r ~ ' ~ Lf , :y .. ~ e... ~ t ~ ~ t _. 1. '~ ~ . ~l ~ 4 t .. ~ ~~ , ' . r i • r 6MC DATA REPORT 3 5 ~ M- 29: 11,506.5 ft Pervasively microstylolitized, moderately sorted, medium-grained, carbonaceous, fossiliferous, feldspathic sandstone with chlorite cements & replacive zeolites. Intercrystalline microporosity -abundant. Sample transected by open, vertical to oblique microfractures. Effective porosity restricted to fracture network. Page 22/36 M-29: 11,507.4 ft 500 microns .. ,~; ~, t ~ ?~ ~ a ~ ~, n ~ a yr 1 -. . _ . ~ _ L ~~ ~~ ~ '#' .mss , .c tc ~r ~ ~ `fir iz ~ ~ . ~ ?* ~ ~+„'" ~~ a~ ~ . t ' 4 t '4u~ ' w r~ ~ '. dfi,3~ Y. - ~. S~ 1 ., ,t' ~c. .. ~ l -n ~ ~y ~ Lp ~s~~~. ff"'"~~'~ w ~M. R .mil A' _r'~ `t ~. ~• _ ~ ~ . .v A 250 microns GMC DATA REPORT 3 5 7 Strongly compacted, well sorted, very fine- grained, carbonaceous, chlorite cemented, lithic-feldspathic-sandstone with pervasive replacement by zeolites, chlorite & clay minerals. Sub-horizontal microstylolites common. Intercrystalline microporosity - abundant. Effective porosity is lacking. Page 23/36 M-29: 11,508.6 ft 500 microns ~{ ~ §jj~~ "'l~ 1 ~ 5 • ~Y+ ,r.`._fy1~ v § T ~ ~ .rte{(i '._ ~ , '~ ',i ~f 4 ~ ' ~ 4 ar, v f r a- ~ 'f ~ Y,~'~' / " 7~"f'~ NA ~y~C ',f is ~ ;, ~, -`i ~ ,~^: ' _ } f 3M1'~' .~ ~~ t,~ysr~ ~ ~ ~f .gyp ~ "Y l~PF'sfi '+ / ~ 4. h. ~.. S t, 't~ ~ 1 ~ ~ '~` / r ~ ~ . r ~ !~ c M 'Cw ~ . ri ~, . '~ 250 microns Strongly compacted, moderately well sorted, very fine-grained, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites, chlorite & calcite. Intercrystalline microporosity- common; open & laumontite-cemented, oblique, en-echelon microfractures -present. Effective porosity limited to fractures. GMC DATA REPORT 3 5 .T page 2 4/ 3 6 ,;:. :~:. ~° 250 microns GMC DATA REPORT S 5 7 M-29: 11,509.5 ft Strongly compacted, poorly sorted, fine- to coarse-grained, feldspathic-lithic (VRF) sandstone with abundant chlorite cements, pseudomatrix & replacive zeolites & clay minerals. Microstylolitic fabrics -pervasive. Intercrystalline microporosity -common. Effective porosity is absent. r~y ~ ~~ ~~, s~ ~ye ~~ f51 :~ •.~ '. Ji,~.. ..... ,.. ~ - e ~e~ . e~ +" Page 25/36 M-29: 11,511.0 ft . y~ ~. ~ "F Yt tt~~~ *O ~~/r ~ { ~~ ~~y~~'J4~J ~. .r, .{, ~ ~ i ~. ~ ~.. M ~ ~ ~~. ~+ r~ ~ h J .~,,,~~ ~ fQ ++~~~~tt Y i~~+ar+~ ~~~ f,.,,„,1 ,? ~. ~, . ,; . .r• ~= . y' ~ : ' ' ', ~ ,~ l ~: 250 microns . f ~ y GMC DATA REPORT 3 5 7 Moderately compacted, moderately sorted, medium-grained, chlorite cemented, feldspathic-lithic (VRF) sandstone with pervasive replacement by zeolites & clay minerals. Intercrystalline micropores - abundant &chlorite-cemented micro- fractures- present. No effective porosity. Page 26/36