岩性油气藏 ›› 2023, Vol. 35 ›› Issue (4): 90101.doi: 10.12108/yxyqc.20230409
刘海磊1, 朱永才1, 刘龙松1, 尹鹤1, 王学勇1, 杜小弟2
LIU Hailei1, ZHU Yongcai1, LIU Longsong1, YIN He1, WANG Xueyong1, DU Xiaodi2
摘要: 利用露头、岩心薄片及地球化学分析资料,对准噶尔盆地阜康断裂带上盘二叠系芦草沟组的岩性、沉积古环境、烃源岩评价及分布特征进行了研究,并探讨了成藏模式。研究结果表明: ①阜康断裂带芦草沟组发育砂岩、泥页岩、碳酸盐岩等多种岩性,以灰黑色、黑色油页岩为主,厚度为200~600 m,见碳酸盐岩与泥页岩互层,碳酸盐岩夹层中可见沥青、油迹。②研究区芦草沟组沉积时期为半深湖—深湖相,气候以干热为主,间歇性出现温湿气候,古水体为微咸水—咸水;博格达山北麓为沉积湖盆的中心,具有更好的沉积和保存条件。③研究区烃源岩有机质丰度高,野外露头岩心Ro值为0.74%~1.28%,钻井岩心TOC值为0.92%~4.48%,主要为Ⅰ和Ⅱ1型,成熟度较高,生烃潜量大,S1+S2多大于20 mg/g,为成熟优质烃源岩;博格达山北麓比西侧烃源岩发育规模更大,成熟度更高,氯仿沥青“A”含量多高于1 200×10-6。④研究区芦草沟组油藏受控于圈闭和断层,北部高陡带油藏多出露地表,遭受破坏,以稠油为主,中部鼻隆带构造稳定,发育8处圈闭;中部鼻隆带油藏表现出自生自储、多期充注的特征,区域内东南部为页岩油勘探的“甜点”区。
中图分类号:
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