Table 1.

Point count data for the 19 Heather Field samples with careful differentiation of pore-filling and grain- and cement-replacive cements to allow for accurate determination of compactional porosity-loss and cementational porosity-loss (CEPL) using methods outlined by Houseknecht (1987) and the assumption that the original porosity was 45% (Beard & Weyl 1973)

Well nameSample depthGrain size, ┬ÁmSorting (trask)Monocrystalline quartz (%)Polycrystalline quartz (%)Detrital K-feldspar (%)Extra-basinal clay-rich lithic (%)Detrital muscovite (%)Detrital rutile (%)Matrix clay (%)Replacive calcite (%)Intergranular porosity-filling calcite (%)
2/5_H110646.05461.5841.75.720.00.72.70.00.30.00.0
2/5_H110711.96431.2950.39.016.00.00.70.03.93.35.0
2/5_H110729.06161.2937.36.311.30.00.70.00.02.332.0
2/5_H110731.31531.2339.77.312.60.00.00.00.03.830.3
2/5_H110734.86541.3033.712.011.70.00.70.00.03.034.4
2/5_210820.02171.2629.06.017.70.02.30.01.03.328.0
2/5_210843.65041.3522.37.722.30.03.70.00.02.733.7
2/5_210861.05741.3244.06.016.00.00.30.00.00.03.4
2/5_210885.16271.3037.79.010.00.00.00.00.03.732.0
2/5_H1811460.32101.2424.73.322.30.01.30.00.02.032.0
2/5_H1811478.51671.2630.33.313.00.01.70.00.05.041.3
2/5_H1811500.31691.341.00.05.90.07.90.00.034.340.7
2/5_H1811527.7N/AN/A39.76.713.00.30.00.30.06.014.0
2/5_H1811543.55831.2436.77.313.00.00.00.00.02.732.3
2/5_H211773.04581.6225.010.320.00.03.00.00.00.632.0
2/5_H211776.01601.2743.010.016.30.00.30.00.00.00.0
2/5_H211797.61721.2236.08.716.70.00.00.00.02.925.0
2/5_H211808.66021.3936.711.012.00.00.00.00.03.724.0
2/5_H211828.15511.1743.310.39.30.01.00.00.01.425.0
Well nameFracture-filling calcite (%)Intergranular porosity-filling chlorite (%)Replacive chlorite (%)Intergranular porosity-filling kaolinite (%)Replacive kaolinite (%)Intergranular porosity-filling illite (%)Replacive illite (%)Intergranular porosity-filling K-feldspar (%)Replacive K-feldspar (%)Intergranular porosity-filling pyrite (%)Replacive pyrite (%)Fracture-filling pyrite (%)
2/5_H10.00.00.07.30.31.32.74.70.31.70.00.0
2/5_H10.00.00.01.70.70.30.02.00.00.30.00.0
2/5_H10.00.00.02.30.00.31.31.70.00.30.30.0
2/5_H10.00.00.00.00.00.00.31.70.00.00.00.0
2/5_H10.00.00.01.70.00.00.00.30.00.30.00.0
2/5_20.00.00.02.00.30.00.72.60.02.00.70.7
2/5_20.00.00.00.30.00.00.34.00.01.30.30.0
2/5_20.00.70.07.70.03.03.31.60.02.70.00.0
2/5_20.30.00.02.00.30.01.31.30.01.00.00.0
2/5_H180.00.00.00.00.00.00.33.00.00.00.00.0
2/5_H180.00.00.00.00.30.00.01.30.00.00.00.0
2/5_H182.30.00.00.00.00.01.30.00.03.92.60.0
2/5_H180.30.70.30.00.00.71.61.30.08.00.70.0
2/5_H180.00.00.01.70.30.00.72.70.01.00.00.0
2/5_H20.00.00.00.00.00.00.34.70.00.00.00.0
2/5_H20.00.00.04.30.00.71.32.30.02.70.00.0
2/5_H20.00.00.00.71.00.01.33.70.01.00.60.0
2/5_H20.00.00.00.00.30.70.35.30.01.30.00.0
2/5_H20.00.00.00.70.00.30.72.70.01.30.00.0
Well nameIntergranular porosity-filling quartz (%)Intergranular porosity (%)Intragranular secondary porosity (%)Fracture porosity (%)Intercrystalline porosity (%)Microporosity (%)Undifferentiated porosity (%)Calculated cement volume (%)Calculated intergranular volume (%)Original porosity destroyed by compaction (COPL) (%)Original porosity destroyed by cemenation (CEPL) (%)Total porosity loss (%)
2/5_H13.62.33.30.00.00.60.318.620.953.641.394.9
2/5_H12.01.31.60.00.01.30.011.312.672.025.197.1
2/5_H11.30.31.00.00.00.60.337.938.215.184.299.3
2/5_H11.00.01.00.00.00.00.033.033.026.773.3100.0
2/5_H11.30.00.30.00.60.00.038.038.015.684.4100.0
2/5_22.70.00.30.70.00.00.037.337.317.182.9100.0
2/5_21.30.00.00.00.00.00.040.640.69.890.2100.0
2/5_22.34.03.90.00.00.70.021.425.443.647.691.1
2/5_20.70.00.00.00.30.00.037.037.017.882.2100.0
2/5_H183.70.00.00.00.00.00.038.738.714.086.0100.0
2/5_H180.30.30.00.70.00.00.042.943.24.095.393.3
2/5_H180.00.00.00.00.00.00.044.644.60.999.1100.0
2/5_H183.01.01.70.00.00.30.027.728.736.261.697.8
2/5_H180.60.00.30.00.00.60.038.338.314.985.1100.0
2/5_H21.71.00.00.00.00.00.038.439.412.485.397.8
2/5_H23.012.32.30.00.00.00.313.025.343.828.972.7
2/5_H20.30.70.30.00.00.00.030.731.430.268.298.4
2/5_H21.00.31.00.00.32.00.032.332.627.671.899.3
2/5_H22.60.30.00.00.00.70.332.632.926.972.499.3