吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (1): 248-260.doi: 10.13278/j.cnki.jjuese.20180187
• 海洋地质与资源 • 上一篇
王修齐1,2, 滕龙2, 郑红军2, 方朝刚2, 张训华1,2
Wang Xiuqi1,2, Teng Long2, Zheng Hongjun2, Fang Chaogang2, Zhang Xunhua1,2
摘要: 下扬子区萍乐坳陷丰城-乐平地区发育二叠系乐平组海陆过渡相泥页岩。在深入调研其构造、沉积背景的基础上,综合利用多种实验手段对岩心有机地球化学特征、岩石类型和矿物特征、物性条件、储集空间类型和含气性进行了系统归纳,并进一步探讨了影响其含气性的沉积和构造因素。研究认为:丰城-乐平地区二叠系乐平组泥页岩厚度差异较大且非均质性较强,王潘里段和下老山亚段为好烃源岩,上老山亚段和中老山亚段为中等烃源岩;其有机质类型以Ⅱ2型为主,东区倾油而西区倾气;成熟度具有"东低西高"的特征;孔隙空间以微孔隙和微裂缝为主,物性整体表现为特低孔低渗。研究区二叠系海陆过渡环境为有利烃源岩的发育提供了基础,适中的埋藏深度保障了页岩气的赋存并可降低开采成本;但东区受推覆带改造使得该区构造复杂,变形强烈,页岩气保存条件差,西部丰城地区则构造稳定,具有较好的页岩气勘探前景。
中图分类号:
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