吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (6): 1631-1641.doi: 10.13278/j.cnki.jjuese.201706103
张兵1, 杨凯1, 贾雪丽2, 郑荣才3, 郭强1, 文华国3
Zhang Bing1, Yang Kai1, Jia Xueli2, Zheng Rongcai3, Guo Qiang1, Wen Huaguo3
摘要: 为了指导部署四川盆地白云岩储层中钻井,在油气钻井岩心观察与描述、野外剖面实测和样品采集的基础上,结合镜下薄片鉴定、X衍射、物性和地球化学特征分析,对开江梁平台内海槽东段长兴组白云岩储层的沉积-成岩系统进行了深入研究。认为台地边缘生物礁和台地边缘浅滩为最重要的储集相带,颗粒白云岩、生物礁白云岩和晶粒白云岩为最主要的储集层岩性,晶间孔、晶间溶孔和超大溶孔为目的层最有效的储集空间,孔洞缝复合型储层为目的层最优质的储集类型。综合分析认为,长兴组沉积-成岩系统与白云岩储层在时空上具有良好的耦合关系,台地边缘生物礁和台地边缘浅滩相控制了白云岩储层的区域分布范围,而不同成岩系统对储层的贡献程度不同。其中:地层封存卤水与混合热卤水成岩系统是储层形成的基础与关键,地层封存卤水形成低孔低渗的孔隙型Ⅲ类储层,混合热卤水形成中孔中渗的孔洞型Ⅱ类储层;构造热液成岩系统对储层贡献最大,并形成高孔高渗的孔洞缝复合型Ⅰ类优质储层。
中图分类号:
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