鄂尔多斯盆地南缘延安地区中深层地热能特征研究

Study on Medium Deep Part Geothermal Energy Features in Yan an Area,Ordos Basin Southern Margin

近年来水热型、浅层地热能发展产生的缺点问题日益突出,以取热不取水为原则,中深层U型水平对接换热技术成为新的技术方向。通过对鄂尔多斯盆地南缘延安地区地层岩性、地温梯度特征、热储层特征等特征研究,分析了研究区中深层地热资源潜力,研究结果表明鄂尔多斯盆地南缘奥陶系马家沟组为良好的热传导型热储,深部地温梯度为3.05℃/100m。当马家沟组深度在3157m时,对应温度达到110.67℃。测井及注水试验结果表明,奥陶系马家沟组为极弱含水层,几乎没有流体,属于良好的干热岩型地热资源,具有较高的开采价值。充分确定了该区地热地质条件良好、地热资源潜力巨大。为合理、高效开发利用该区地热资源提供了科学依据,对进一步开发利用该区的地热能具有重要意义。

In recent years,shortcomings from hydrothermal and shallow geothermal energy exploitation are increasingly prominent;the principle is taking only benefits from heat and looking down upon water.Thus the medium deep part U-typed well horizontal docking heat transfer technology has been become a new technical trend.Through study on strata lithologic,geothermal gradient and heat reservoir features,analyzed study area medium deep part geothermal resources potential.The result has shown that the Ordovician Majiagou Formation in the Ordos Basin southern margin is excellent heat conduction type geothermal reservoir,deep part geothermal gradient is 3.05℃/100m.When the depth of Majiagou Formation strata is 3,157m,corresponding temperature can be 110,67℃as high.The well logging and water injection test results have shown that the Majiagou Formation is a very weak aquifer,almost without water,thus a good hot dry rock type geothermal resource with higher exploitation value.Thus the study has provided scientific basis to reasonably,efficiently exploit and utilize geothermal resources in the area with significance to further geothermal energy exploitation and utilization.