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地应力是影响储层流体压力和驱动油气运移的主要动力之一。首先根据鄂尔多斯盆地苏10区块地质及区域构造应力场的特征,建立了该区块三维有限元模型。通过数值模拟分析,得到了目的层的平均应力、最大水平主应力等地应力等值线分布图,在此基础上进一步计算了油气运移势场。其次,综合分析了构造应力场与流体势场数值模拟结果和气井的生产情况,发现气井的高产井区为地应力场和流体势场的低值区。由此分析认为:在构造应力场作用下,油气易于从地应力场的高值区向低值区运移与富集,从流体势场的高势区向低势区运移与富集。
In-situ stress is one of the major driving forces that affect reservoir fluid pressure and drive hydrocarbon migration. First of all, according to the geological and tectonic stress field characteristics of Block Su 10 in the Ordos Basin, a three-dimensional finite element model of the block is established. By means of numerical simulation, the distribution maps of geostress such as average stress and maximum horizontal principal stress of the target layer are obtained, and on the basis of which, the migration potential field of oil and gas is further calculated. Secondly, the numerical simulation results of tectonic stress field and fluid potential field and the production of gas wells are comprehensively analyzed. It is found that the high-yielding well of gas wells is the low-stress region of geostress and fluid potential. From this analysis, it is thought that under the action of tectonic stress field, oil and gas are easy to migrate and enrich from the high value area to the low value area of the earth stress field, and migrate and enrich from the high potential area to the low potential area of the fluid potential field.