Mineralogy and Particle Size Analysis

Western Atlas International
A Litton/Dresser Company

CORE LABORATORIES

UNION OIL CO. OF CALIFORNIA

ASETª MODEL COMPONENTS
MCKITTRICK FRONT 418
CYMRIC FIELD
KERN COUNTY, CA

CL FILE #57111-92021

PERF0RMED BY:
CORE LABORAT0RIES
3430 UNIC0RN R0AD
BAKERSFIELD, CA 93308
(805) 392-8600

REPORT PRESENTED
AUGUST 28, 1992

INTRODUCTION


Core Laboratories was requested to create an ASETª model from conventional core samples supplied from the McKittrick Front 418 well in the Cymric Field, Kern County, CA. Presented herein are the results of the porosity, permeability to air, Mineralog and Laser Particle Size Analysis portions of this study.

We appreciate this opportunity to be of service and look forward to applying the developed model in your reservoir.

DESCRIPTION OF SERVICES


Samples of conventional core material in the form of 1" diameter drilled core plugs were selected from the conventional core based on the hydraulic units identified from the conventional core analysis.

Mineralogª Analysis
Mineralogª utilizes Fourier Transform Infrared Spectroscopy to determine mineral composition. The analytical technique is based upon the infrared absorption of a finely ground sample dispersed in a potassium bromide matrix and provides rapid quantification of specific rock-forming minerals. The weight percentages of the mineral constituents identified are reported with an accuracy of ± 5 percent.

Calculated Grain Density
Grain density calculations from Mineralogª analysis are based upon the mineral densities of the standards used for calibration of the equipment. Due to the chemical variability of certain minerals, the densities used may not ecessarily be identical to those of the minerals from a specific location.

Quartz 2.65 Analcime 2.3 Magnesite 3
Plagioclase 2.63 Hornblende 3.2 Ankerite 3.01
K-spar 2.56 Siderite 3.96 Perlite 2.1
Calcite 2.71 Gypsum 2.32
Dolomite 2.86 Apatite 3.15
Pyrite 5 Opal-CT 2.3
Kaolinite 2.59 Opal-A 2.2
Chlorite 2.78 Albite 2.62
Illite 2.66 Cristob. 2.32
Smectite 2.53 Tridymite 2.26
Anhydrite 2.96 Chert 2.6
Barite 4.48 Aragonite 2.95
Celestite 3.97 Coal-1 1.1
Laumontite 2.27 Coal-2 1.1
Muscovite 2.85 Dawsonite 2.44
Biotite 3.2 Fe-Dolomite 2.87

Laser Particle Size Analvsis (LPSA)
LPSA utilizes laser diffraction techniques to determine the volumetric grain size distribution of a sample.

Material coarser than 800 microns required that a grain density be determined and the weight size fraction be determined. This material was dry sieved and then converted to volumetric percentages for incorporation with the LPSA data (finer than 800 microns).

A sample split of the material finer than 800 microns was then dispersed in a liquid medium and passed in front of a laser with the resulting dispersion pattern being analyzed by computer. The resulting size data is presented in both tabular and graphical formats for the conventional core locations.

ASET Calibration
The conventional core sample data was merged with its Mineralog and LPSA data to develop the relationships between porosity and the mineralogic and textural components. Relationships were also developed between permeability and the mineralogy and texture of the samples. The model was then tested with additional samples which were not part of the original calibration.

Once the conventional core model was complete, the mineralogy of the sidewall core samples were compared to the conventional core sample mineralogy to determine which sidewall cores could be used to model textural alteration. This was successfully achieved. The sidewall core samples textural characteristics were then modified based on the mineralogic components present. Once the textural corrections were made to the sidewall cores, they could be imported into the conventional core model. The resulting ASET data for these sidewall cores along with the LPSA and Mineralog data are included in this report.

Company: Union Oil Co. of California Field: Cymric File: 57111-92021
Well: McKittrick Front 418 Formation: Date: 3-Aug-92
County: Kern State: Calif. Analyst: AB
ADVANCED SOFTCORE EVALUATION TECHNOLOGY
Conventional Core
Depth (ft) a b c d e f g h i j k l Lith. Desc.
1145.7 70.9 13.99 0.139 14.2 71.2 2.3 2 7 0 High 0.01 * Diat, slty,
1188.5 64 5.32 0.09 5.4 64.1 2.35 17 7 4 Low 0.008 *
1275.5 68 11.28 0.128 11.3 68 2.32 5 8 0 Med 0.01 * Diat, slty,
1298.5 68.6 9.57 0.11 79 68.5 2.3 5 7 0 Med 0.009 * Diat, slty,
1308.5 67.5 6.95 0.1 16.6 67.2 2.29 0 7 0 High 0.008 * Diat, slty,
1360.5 65.9 6.19 0.09 66.2 65.8 2.35 7 11 0 Med 0.008 * Diat, slty,
1377.5 66.1 9.77 0.12 19 66 2.32 0 2 6 High 0.01 * Diat, slty,
1430.S 66.5 8.18 0.11 8.6 66.5 2.31 7 9 2 Med 0.009 * Diat, slty,
1490.5 62.9 14.88 0.153 14 62.4 2.33 8 8 3 Med 0.014 * Diat, slty,
1595.6 57.6 l2.38 0.146 12.9 57.4 2.38 16 4 1 Low 0.016 * Diat, slty,
1695.5 56.5 2.6 0.06 72.6 56.8 2.42 19 5 7 Low 0.0077 * Diat, slty,
1740.4 52.9 3.94 0.08 63.9 52.9 2.42 18 0 9 Low 0.0112 * Diat, slty,

a ASET Porosity Index (%)
b ASET Perm Index (mD)
c Reservoir Quality Index (microns)
d Core Saturation, Oil (%PV)
e Core Saturation, Water (%PV)
f Grain Density Index (gm/cc)
g Total Clay (%)
h Potassium Feldspar (%wt)
i Acid Solubility (%wt)
j Sanding Potential
k Median Grain Diameter (mm)
l Gravel Pack (mesh)
Company: Union Oil Co. of California Field: Cymric File: 57111-92021
Well: McKittrick Front 418 Formation: Date: 3-Aug-92
County: Kern State: Calif. Analyst: AB
ADVANCED SOFTCORE EVALUATION TECHNOLOGY
Sidewall Core
Depth (ft) a b c d e f g h i j k l Lith. Desc.
1145 68.5 7.52 0.104 61.4 38.5 2.32 13 8 0 Low 0.008 * Diat, slty,
1188 68 7.24 0.102 60.6 38.9 2.33 12 6 4 Low 0.008 * Diat, slty,
1228 66.5 3.64 0.073 61.2 38.3 2.33 14 7 4 Low 0.006 * Diat, slty,
1265 72 9.69 0.115 65.7 34.2 2.29 6 7 0 Med 0.008 * Diat, slty,
1275 63.5 6.46 0.1 51 48.2 2.36 16 11 0 Low 0.009 * Diat, slty,
1298 66.5 6.46 0.098 57 41.6 2.33 17 8 0 Low 0.008 * Diat, slty,
1308 74 14.11 0.137 65.7 33.3 2.27 0 7 0 High 0.009 * Diat, slty,
1318 70.1 10.69 0.123 57.2 42.1 2.29 0 7 2 High 0.009 * Diat, slty,
1340 41.5 7.15 0.13 37.3 40.6 2.7 0 0 81 Low 0.008 * Diat, slty,
1360 69.8 10.43 0.121 73.3 26.6 2.29 3 7 0 High 0.009 * Diat, slty,
1377 69.7 15.48 0.148 74.1 25.5 2.29 0 5 0 High 0.011 * Diat, slty,
1385 70.1 13.18 0.136 80.1 19.3 2.3 0 6 0 High 0.01 * Diat, slty,
1430 68.5 11.75 0.13 55.4 43.9 2.32 13 8 0 Low 0.01 * Diat, slty,
1444 72 21.81 0.173 68 31.8 2.28 0 10 1 High 0.012 * Diat, slty,
1460 66.6 6.51 0.098 80.1 19.7 2.29 8 0 0 Med 0.01 * Diat, slty,
1490 66.4 10.04 0.122 79.2 20.4 2.3 12 4 3 Low 0.01 * Diat, slty,
1510 65.8 6.14 0.096 73.4 26.3 2.32 5 0 1 Med 0.013 * Diat, slty,
1534 65.5 5.97 0.095 36.2 42.4 2.33 7 0 0 Med 0.018 * Diat, slty,
1595 59.7 3.73 0.079 52.9 44.1 2.38 18 4 1 Low 0.01 * Diat, slty,
1620 59.7 3.73 0.079 47 46.2 2.37 17 4 2 Low 0.008 * Diat, slty,
1655 53.2 2.08 0.062 20.9 72.2 2.42 27 0 4 Low 0.008 * Diat, slty,
1670 60.8 4.09 0.081 6.8 74 2.37 15 5 0 Low 0.008 * Diat, slty,
1695 46.8 0.82 0.042 9.7 83.7 2.48 37 5 7 Low 0.007 * Diat, slty,
1740 56.8 2.9O 0.071 6.5 76 2.41 20 5 6 Low 0.007 * Diat, slty,

a ASET Porosity Index (%)
b ASET Perm Index (mD)
c Reservoir Quality Index (microns)
d Core Saturation, Oil (%PV)
e Core Saturation, Water (%PV)
f Grain Density Index (gm/cc)
g Total Clay (%)
h Potassium Feldspar (%wt)
i Acid Solubility (%wt)
j Sanding Potential
k Median Grain Diameter (mm)
l Gravel Pack (mesh)