页岩气“甜点”地震预测研究——以鄂尔多斯盆地西缘中上奥陶统为例

Seismic prediction of “sweet spots” for shale gas

为寻找页岩气勘探开发的"甜点"区,以鄂尔多斯盆地西缘中上奥陶统为研究对象,首先建立研究区优质页岩与各种岩石物理参数之间的对应关系,然后运用地震预测技术预测页岩气地质"甜点"和工程"甜点",最后对预测结果进行综合分析及评价。结果表明,鄂尔多斯盆地西缘中上奥陶统乌拉力克组孔隙度、脆性指数、总有机碳含量较高,裂缝较为发育,为页岩气勘探的"甜点"区。

In order to find the "sweet spots" area for shale gas exploration and development, the middle and upper Ordovician in the western margin of Ordos basin is taken as the research object. Firstly, the corresponding relationship between high-quality shale and various rock physical parameters in the study area is established. Then, the "geological sweet spots" and "engineering sweet spots" of shale gas are predicted by using seismic prediction technology. Finally, the prediction results are comprehensively analyzed and evaluated. The results show that the porosity, brittleness index and total organic carbon content of the middle upper Ordovician Ulalik formation in the western margin of Ordos basin are relatively high, and the fractures are relatively developed, which is the "sweet spots" area for shale gas exploration.