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Home My WebLink AboutGMC Data Report No. 012THERMAL~MATURATIONANALYSIS-AMOCOCA~RAL RIVER NO. 1 10,255 to 11,850' TOTJtL OR~%NIC CARBON ROCK-EVALPYROLYSIS . KEPOriT NO 823-7TM TOTAL ORGANIC CARBON AND ROCK-EViL PYROLYSIS OF SEVENTEEN.~,~,,,-~"*°?,.,,.,.,~ ~'ROM THE CATHEDR_-'.-L ~IVE.K WELl., Projeot No. P.P. US/8?,3/T/7/2 (B) F--~pa,,.ed by: Rcbertson Research (U. ~ 3 Ir, o. I~?~9 HeC~°-croft, Suite 306 Houston, Texas ~05U-35~,. ~. Pr~_pare~ for- Cities Service Company Expl. a~]d Prod, R.esearch P.. O. Box T'alsa. O.~;/anoma ? ¢i'22 - INTRODUCTION Seventeen Samples from the interval 10,255 to 11,850 feet of the Cathedral River well were forwarded for total organic carbon (TOC) and l~ock-Eval pyrolysis, the latter to be run on every other sample regard- less of the TOC value. · SUMMARY The total organic carbon values range from 0.5 to 0.7 wt. %, indicating a marginal source quality. The pyrolysis data suggest that the level of maturity is near the end of the oR-generating window. The low S2 and S2/S3 values reflect the present state of the kerogen a]~d are not necessarily indicative of the original generating capabilities. The T-max values for samples 10,255 and 10,450 feet are unreasonably low eonsideririg the trend of the remaining samples. ROBERTSON RESEARCH (U.S.) INC. IYPEJ ~: ~x~.~T~' AMORPHOUS ' ~s~s ~ CATHEDRAL RIVER WELL MATURITY FLUORES- GENERATION CENCE INTENSITY ZONES. i i I I ! I 11 SOURCE RICHNESS ORGANIC CARBON) e'.5 I]0 ,, Y£RY GOOD I : FIGURE I: SUMMARY PLOTS SHOWING KEROGEN TYPES, MATURITY, AND SOURCE ,RICHNESS (SEE APPENDICES I AND III) CATHEDRAL RIVER WELL SOURCE POTENTIAL (S2) 2.5 PETROLEUM TYPE (S2/S3) L5 5.0 l~"I, GAS OIL I GENERATION Z 0 N E S (T-max) I : ! PRODUCT ] V ] TY INDEX (Si/ESl+S2]) , INI) I ORATE:I) FIGURE 2: SUHHARY PLOTS OF ROCK-EVAL PYROLYSIS DATA (APPENDIX II) :ATHED~AL R~VER WELL 41~0 20~ 125 150 1 '75 2~g F~GURE $: AEROGEN TYPE DETERmINAT]ON FROm PYROLYSIS DATA (APPENDIX ROBER I ,..~ON RESEARCH (U.S.) INC. APPENDIX I , TOTAL ORGANIC CARBON DATA Total organic carbon is determined by pulverizing the sample, treating a carefully weighed portion with warm hydrockloric acid to remove car- bonate miner ~ais, and analysing the residue for carbon content with a Leco carbon ana!yser. It is generally accepted that samples ~ith less than about 0.5 percent TOC cannot yield sufficient petroleum to form commercial deposits and are therefore considered nonsources; samples with between 0.5 and 1.0 TOC are rated as marginal in source quality; and samples with more than 1.0 TOC are considered to be good ir. source quality. ROBEH "i SON RESEAROH (U.S.) INC. i07 10.~ 107 1:0 et 5O 5O 50 50 DEPTH (Feet) 11150 0.6i 11250 0.60 ~1350 0.52 114~ 0.5? '0. 61 0.66 ¢ .61 !! I1 ?50 0 63 850 O.EO ROBERTSON RESEAROI-! (U.S.) INO. APPENDIX II _ ROCK-EVAL PYROLYSIS DATA Rock-Eval data are expressed as mg/g of rock and include four basic parameters: 1) S1 represents the quantity of free hydrocarbons pre- sent in the rock and is roughly analogous to the solven+~ exrrac:ab!e portion of the organic matter; 2) S2 represents the quanlity of hy- drocarbons released by the kerogen in the sample dtu~ing pyrolysis; 3) S3 i~ related to the amount of oxygen present in the kerogen; and 4) T-max, in °C, is the temperature at which the maximum rate of generation (of the S2 peak) occurs and can be used as an eszimate of thermal matu~y. in addition, the ratio S2 / S3 provides a general indication of kerogen quality (type) and reveals whether oil or gas are likely to be generated. The ratio S1 / (S1+S2), or the productivity index, is ar, indication of the relative amount .of free hydrocarbons (in place or migrated) present in the s.'mple. '.~.'~,~_~',.fen and oxygen ir.;dex values are in mg of hydrocarbons (S2 peak) or c~.bo~ diolide [S3 peak) per gram of organic carbon. When plotted against each other on a van Krevelen-~ype diagram, information on kerogen type and maturity can be obtained. Data are interpreted in the following manner: Source Potential - values of S2 <2.5 : poor 2.5-5.0 : marginal > 5.0 ~ : good Petroleum Type - value of S2/S3 <2.5 : dry gas 2.5-5.0 : wet gas >5.0 : oil' Generation Zones - values of T-max <435 : immature 435-470 : °fl 45~ · : gas Productivity Index - high values of Si/(sI+S2) indicate mig'rated hydrocarbons. ROBER 'i SON RESEARCH (U.S.) INC. (FEET) 2025.% lOq50 !~250 CATME~KAL ~iVER 0.2 0.2 · 3 ! O. : · a 5~ S* 53 ·224 .2?8 .292 ~1 0.0¢~ 0 ?5 0.107 0 ·220 ..380 .I74 0 .37.3 0.508 0.242 O.!Z2 0.25! 0.270 C.~'~ 0.4~I 439 ~.&53 467 0 s25 4~5 0.~27 ROBEH I SON RESEARCH (U.S.) INC. MYIDROG-'-N AND OXYGEN INDICES FROM ROCK-I~VAL PYROLYS!_~ DATA. ~iTI~ TOG DATA CATHEDRAL RIVER ~£LL DE?TM EYDROG£N INDEX OXYCEN INDEX 10255 43 11850 18 53 47 4'7 : TOC 0 .57 0.64 0 0.6: 0 .60 0.57 0.60 ROBERTSON RI~SEAROH (U.S.) INO. REFLECTED LIGHT ?.~ICROSCOPY DATA A sample of ground rock is treated successively with hydrochloric and hydrofluoric acids to -concentrate the kerogen, freeze-dr~.ed, mounted in an e ox · nd polished. Kerogen type is identified with the aid of blue light fluorescence. The visual kerogen analysis data sheet contains visual percentage esti- mates of each principle kerogen type, notes on vitrinite description, and kerogen fluorescence data. The histograms 'show measured reflectance values of all vir~nmite pre- sent and on all material with the visual appearance of vil~-~.nite. Shaded values are those used to calculate the interpreted vitrinite re- flectance maturities. Unshaded values are interpreted to be oxidized vitrinite, recycled vitrinite, or possibly misidentif~ed material such as solid bitumen, pseudo-vit~Luite, or semifusinite. Sometimes the .samples analysed contain no vitrinite or have an insufficient number of readings to allow a reliable maturity determination to be made. A/ret- nate maturity calculations are possible on a few samples. The histo- sraras are identified by a sequence number and depth or notation. ROBER I SON RESEARCH (U.S.) If*..l(.~.. II l II II II II II II i i . . ROBERTSON RESEARCH (U.S.)INC. REFLECTED LIGHT VISUAL KEROGEN ANALYSIS ....... . J ORGANIC UATTEF1 I SAUPLE '| 'JtTR,.I'T~"|ALO~E~EI ' . , . : ? - - ..... O ' NONE ~ o T TRACE ~ -- m SMALl. AMT. ~ ~ ~ M - MODERATE AMT. ' .... J ' J J' J J J J i I J i [, j ~ ~ ~ I- P $ 0 VITRINIT[ REFLECTANC-:. (RANDOI'q =t _ %1 %1 %1 %1 %1 %1 2~ 33 4t 47 ?$ DEPTH 10550.0 3247.0 '~ ~ RO ~ATURIT¥ ' VALUES 6.00 ~EAN 1.47 ST~ gEV 0.17 ~EDIAN i.47 '~0DE 1.45 , , ROBERTSON RESEARCH (U.S.) INC.