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Glacial Loading: A Cause of Natural Fracturing and a Control of the Present Stress State in Regions of High Devonian-Shale Gas Production

机译：冰川负荷：高泥盆纪 - 页岩气生产区天然压裂成因及当前应力状态的控制

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It is likely that ice sheets contributed significantly to natural fracturing and hence gas production in low permeability Devonian shale. The large ice sheet of the last ice age caused considerable deflection of the lithosphere. Predicted horizontal tensional stresses south of the glacial limit resulting from this crustal flexing exceed the tensile strength of Devonian shale. Glacially induced fracturing is therefore expected in these regions which correspond with regions of historical gas production. The north-south variation in observed stress ratios is also explained by the glacial model. Lineaments and faults will perturb locally the glacially induced stresses and, when coupled with the glacial model, offer an exploration rationale.

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作者
Clark, J. A.;
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年度 1982
页码 1-20
总页数 20
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Black shales; Natural gas deposits; Glaciers; Devonian period; Fractures; Exploration; Natural gas; Production;

机译：黑色页岩;天然气沉积;冰川;泥盆纪;裂缝;勘探;天然气;生产;

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Glacial Loading: A Cause of Natural Fracturing and a Control of the Present Stress State in Regions of High Devonian-Shale Gas Production

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