岩性油气藏 ›› 2021, Vol. 33 ›› Issue (6): 5969.doi: 10.12108/yxyqc.20210607
邵晓州1,2,3, 王苗苗4, 齐亚林2,3, 贺彤彤5, 张晓磊2,3, 庞锦莲2,3, 郭懿萱2,3
SHAO Xiaozhou1,2,3, WANG Miaomiao4, QI Yalin2,3, HE Tongtong5, ZHANG Xiaolei2,3, PANG Jinlian2,3, GUO Yixuan2,3
摘要: 鄂尔多斯盆地平凉北地区延长组长8油层组是增储上产的重要层系,油水关系复杂,成藏控制因素多样。通过原油特征、地层水性质、储层薄片、压汞实验、地震解释等资料,结合烃源岩地球化学、流体包裹体、纳米CT等测试技术,对该地区长8油藏特征及控制因素进行了研究。结果表明:平凉北地区长8油藏原油密度和黏度较大,整体流动性较差,成熟度较好,地层水以CaCl2型为主,平均矿化度为37.45 g/L,保存条件较好。上部紧邻的长7泥页岩TOC质量分数平均为4.89%,氯仿沥青“A”平均值为0.51%,w(S1+S2)平均值为17.11 mg/g,具有较好的生烃能力。长8储层储集空间以粒间孔、长石溶孔为主,物性好,非均质性较强。受区域多期构造运动作用影响,形成了凹隆相间的构造格局,整体呈“马鞍”状构造形态,低幅度鼻隆构造发育。平凉北地区长8油藏属“近源成藏”,长7烃源岩生成的油气通过砂体、裂缝、断层等运移到长8有利圈闭中,发育岩性、构造-岩性和岩性-构造3种类型的油藏。烃源岩品质、储层物性好坏、低幅度圈闭大小是控制该区长8油藏分布的主要因素。
中图分类号:
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