Exploration / Appraisal of Shales. Petrophysics Technical Manager Unconventional Resources
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1 Exploration / Appraisal of Shales Rick Lewis Petrophysics Technical Manager Unconventional Resources
2 Organic Shale
3 Factors Controlling Gas Reservoir Quality Conventional sandstone Mineral framework Gas shale Schlumberger Kerogen Private 700 µm Pore system 100 µm Free gas in pore space Free gas in pore space Adsorbed gas on kerogen
4 Shale in Perspective: Permeability Arab-D Carbonate Berea Sand Brick Jonah Lance Fm. Organic Shale Cement Salt e-06 md
5 Shale Evaluation Needs Delineate organic shale beds Quantify mineralogy (clays) Accurate log evaluation Completion design Quantify hydrocarbon in place Predict producibility Permeability Pressure Amount and type of fractures Determine lateral landing point Near and far-field stress profile Rock quality Optimize frac design Near and far-field stress Rock quality Fluid compatibility Fines production GR sampling every ½ ft 10 ft
6 Key Factors for Economic Shale Gas in Place Matrix Permeability Hydraulic Fracture Surface Area Hydraulic Fracture Conductivity Hydraulic Fracture Containment Reservoir Quality Completion Quality Evaluation Process Must Address These Factors!
7 Reservoir Quality Phyllosilicate Pores Organic Pores Moncrieff 2009
8 Clay Quantification Necessary for shale gas evaluation Kerogen volume S w Geochemical log is key to evaluation Si, Ca, Fe, S, K SpectroLith lithology Independent of measurements affected by kerogen Gas Shale NPLC Detector Acquisition Cartridge AmBe Source BGO Crystal and PMT Boron Sleeve Electronics Heat Sink Dewar Flask Gamma Ray
9 Shale Lithology Woodford Barnett Fayetteville Haynesville Marcellus Eagle Ford Kerogen Hydrocarbon-filled porosity
10 Organic Geothermal Diagenetic Criteria Only measure with core
11 Porosity / Saturation S w 1 0 Phi Total Phi Eff Phi Pore Water
12 Gas Adsorption Free gas Schlumberger Private ~0.4 g/cm 3 Adsorbed gas Kerogen
13 Shale Gas Adsorption / Desorption Isotherm Langmuir Equation Gold Standard for adsorption Outputs VL P L TOC content Temperature Typically only methane Assume complete saturation Assume no input from clay
14 GIP - Importance of Pore Pressure 350 Gas Con ntent, SCF/ton Total Gas Pore Gas Adsorbed Gas ,000 2,000 3,000 4,000 5,000 6,000 Pressure, psia
15 Well GAS Cumulative Production, Mscf 2E E E E E+006 1E Well GAS Production Rate, Mscf/d Matrix Perm vs. Production Barnett Vertical Wells Km = 500 nd Km = 100 nd Cumulative Time (days)
16 Shale Permeability Hydraulic Fractures at 250 ft Spacing (400 nd) 5 Year Pressure Transient 10 Year Pressure Transient 60 Year Pressure Transient
17 Matrix Permeability Range md to md (1000 nd to 0.1 nd) General algorithm exists Tuned algorithms for basins Calibrated to TerraTek data Function of Porosity Water saturation Specialized core analysis
18 Barnett Shale - Log vs. Core Comparison GR Resistivity Porosity RHOB RHOM ECS / XRD ELAN Sw Porosity TOC Perm GIP Gas-Phi
19 Gas Shale Pay Parameters Sample No A-R Bulk Density A-R Grain Density Dry Grain Density Porosity Water Saturation Gas Saturation Mobile Oil Saturation Gas- Filled Porosity Bound Hydrocarbon Saturation Bound Clay Water Pressure Decay Perm (g/cm 3 ) (g/cm 3 ) (g/cm 3 ) (% of BV) (% of PV) (% of PV) (% of PV) (% of BV) (% of BV) (% of BV) (md) (wt %) TOC Effective phi: 4 to 14 pu Ro: >1.0 Saturations: S w < 45%, S o < 5 to 15% Permeability: >100 nd TOC: >2 wt%
20 Completion Quality
21 Unique Geomechanical Properties of Organic Shales Earth Scale SEM Scale Thin Section Scale Log Scale
22 Impact of Shale Laminations on Stress Sonic Scanner Laminations lead to significant differences between horizontal and vertical properties Shear velocity Young s Modulus Poisson s Ratio Bedded Shales Transverse Isotropic Vertical Horizontal Young s Modulus Horizontal Poisson s Ratio Vertical Poisson s Ratio Vertical Young s Modulus Sample 1 Sample 2 Core Measurement
23 σ Hmin Expandable Clay 2D 3D Lithology Pay Stress Concentration Red low stress Blue high stress
24 Importance of Lateral Landing Point Location Well # 1 Well # MMCF/ft < 1BCF Well 332 MMCF/ft 3 BCF Well 3 new wells drilled with lateral placed in low stress interval Original well IP 1.2 MM/day New wells IP from 2 to 4 MM/day After Tax Rate of Return doubled EUR increased by 20% Profit to Investment Ratio double
25 Lithology-Based Shale Classification Grains >4 µm argillaceous Matrix Composition siliceous calcareous
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