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鄂尔多斯盆地晚古生代气藏在成藏过程中一个独特的特点是气水过渡带发生过迁移. 应用储层中流体包裹体捕获温度, 结合该盆地沉积-构造史及古地温史, 推算出该气藏在不同时期气水过渡带中包裹体的形成时间, 并在此基础上, 绘制出气水界面迁移的等时线图. 结果表明: 该气藏最早于165 Ma左右(晚侏罗世) 在延安一带聚集成藏, 并由南向北逐渐扩大与推移, 在129 Ma左右基本成型. 在晚白垩世由于盆地整体抬升, 气源补给不足, 气藏气水过渡带向南退缩至现今气水过渡带位置.
A unique feature of the Late Paleozoic gas accumulation in the Ordos Basin during the hydrocarbon accumulation process is the migration of the gas-water transitional zone. Using the temperature of the fluid inclusions in the reservoir and combining with the sedimentary-tectonic history and paleotemperature history of the basin, The formation time of the inclusions in the gas-water transitional zone at different periods is plotted, and on the basis of this, an isochronal plot of migration of gas-water interface is drawn. The results show that the gas reservoir was formed at about 165 Ma (Late Jurassic) Yan’an area gathered into the reservoir and expanded gradually from south to north, forming at about 129 Ma. In the Late Cretaceous, due to the uplift of the basin as a whole, the gas supply was insufficient and the gas-water transition zone of the gas reservoir shrank southward to the current gas-water Transitional zone location.