吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (2): 526-538.doi: 10.13278/j.cnki.jjuese.20170236
杨冰1,2, 许天福3, 李凤昱3, 田海龙3, 杨磊磊4
Yang Bing1,2, Xu Tianfu3, Li Fengyu3, Tian Hailong3, Yang Leilei4
摘要: 油气储层的质量及演化往往受沉积作用和成岩作用的共同制约,成岩作用是影响储层孔渗最直接的因素,水-岩反应贯穿于整个成岩作用阶段,决定了孔渗的演化过程。本次研究以鄂尔多斯盆地东北部上古生界陆源碎屑岩储层下石盒子组-山西组为对象,运用多相流反应溶质运移数值模拟的方法,定量研究水-岩化学作用对含油气盆地储层渗透性能的影响,再现水-岩反应所造成的储层矿物溶解、沉淀以及储层渗透性的变化。结果表明:在成岩作用初期,矿物溶解过程占主导地位,模型运行50 Ma时,储层孔隙度由初始的0.30增至0.36,渗透率由初始的5.00×10-15 m2增至8.70×10-15 m2;在油气充注阶段(气体CO2为主),整个成岩作用矿物的沉淀量大于矿物的溶解量,导致固相体积增加,模型运行20 Ma时,储层孔隙度由0.20降低至约0.15,渗透率由5.00×10-13 m2下降至约2.00×10-13 m2。
中图分类号:
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