岩性油气藏 ›› 2015, Vol. 27 ›› Issue (6): 125131.doi: 10.3969/j.issn.1673-8926.2015.06.017
陈 杰1,杜 洋1,彭 湃1,黄贺雄2,童明胜1,熊 舒 3
Chen Jie 1,Du Yang 1,Peng Pai 1,Huang Hexiong 2,Tong Mingsheng 1,Xiong Shu 3
摘要:
通过对伊朗 A 油田上白垩统 Sarvak 组油藏油水界面倾斜原因进行分析,认为水动力作用不是造成该现象的主要原因,储层非均质性能够造成该现象但也不是主要原因,而晚期的构造急剧调整是造成该现象的主要原因。在区域沉积与构造演化分析的基础上,运用地震层拉平技术对伊朗 A 油田不同时期古构造圈闭进行恢复,结合成藏研究认为,新近纪末扎格罗斯构造运动造成油田圈闭超晚期调整,构造调整速率远大于流体调整速率,从而造成了 Sarvak 组油藏油水界面大幅度倾斜,油藏目前仍处于新的运移、聚集与调整过程中,为非稳态油藏;古新世晚期 Sarvak 组地层形成北高南低的古背斜圈闭,新近纪扎格罗斯造山运动导致圈闭形态发生改变,南部原古构造低点大幅度抬升,快速演变为现今南高北低的构造形态;圈闭条件的改变打破了古油藏内流体的动力平衡,烃类发生二次运移,现今大幅度倾斜的油水界面为古油藏尚未调整完毕所显示的特征。油藏优势开发区域为古构造高部位,即现今 Sarvak 组油藏北高点的西侧,其次为古构造与现今构造高部位之间的过渡带。
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