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Re-recognition of “unconventional” in unconventional oil and gas
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JIAO Fangzheng
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Table 6 Main parameters of shale gas reservoirs in the Sichuan Basin.
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| Gas field | TOC/% | Gas content/ (m3?t-1) | Free gas content/% | Porosity/
% | Microfracture
development degree | Local structure | Pressure
coefficient | Original average daily production/104 m3 | | Fuling | 0.3-6.8(3.6) | 0.35-9.63(4.21) | 60-80 | 5.0-8.6(6.4) | Developed | Box anticline | 1.55 | 32.3 | | Weiyuan | 1.9-6.4(2.7) | 2.74-5.01(2.92) | 60-70 | 3.9-6.7(5.3) | Relatively developed | High part of the slope | 1.00-1.70 | 16.8 | | Changing | 1.9-7.3(4.0) | 1.70-6.50(4.10) | 60-70 | 3.4-8.2(5.4) | Relatively developed | High part of the slope | 1.35-2.03 | 18.6 | | Zhaotong | 1.6-4.9(3.2) | 0.60-5.80(2.30) | 60-70 | 2.6-7.9(5.0) | Relatively developed | High part of the slope | 1.00 | 18.0 | Evaluation crite-
rion of sweet spot | >3.0% | >3 | >60 | >4.0 | Relatively developed | Positive structure | >1.20 | >10 |
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