石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (1): 107-123.doi: 10.11743/ogg20210110
蔡全升1,2(), 陈孝红2,*(), 张国涛2, 张保民2, 韩京3, 陈琳2, 李培军2, 李炎桂4
收稿日期:
2019-05-22
出版日期:
2021-02-28
发布日期:
2021-02-07
通讯作者:
陈孝红
E-mail:cqsh0713@163.com;yccxiaohong@163.com
第一作者简介:
蔡全升(1988-), 男, 博士、助理研究员, 沉积地质学。E-mail: 基金项目:
Quansheng Cai1,2(), Xiaohong Chen2,*(), Guotao Zhang2, Baomin Zhang2, Jing Han3, Lin Chen2, Peijun Li2, Yangui Li4
Received:
2019-05-22
Online:
2021-02-28
Published:
2021-02-07
Contact:
Xiaohong Chen
E-mail:cqsh0713@163.com;yccxiaohong@163.com
摘要:
近年来,鄂西宜昌地区上奥陶统五峰组-下志留统龙马溪组页岩气勘探取得了一系列重要发现和突破。为进一步明确该区五峰组-龙马溪组页岩气勘探潜力,文章在前人研究的基础上,利用钻井及野外露头资料,结合地震、测井和分析测试数据,对宜昌地区五峰组-龙马溪组页岩气储层发育特征、优质储层分布及勘探潜力等进行了深入研究。结果表明,宜昌地区五峰组-龙马溪组下部黑色富有机质页岩储层岩石类型丰富,普遍具有高硅(石英平均含量>50%)、高碳(TOC平均为2.47%)、高成熟度(Ro普遍大于2%)、低孔(普遍低于5%)和特低渗(平均为0.19×10-3 μm2)特征,储层含气性较好,平均含气量超过2.0 m3/t。优质储层主要集中在五峰组和龙马溪组黑色页岩下部,对应于凯迪阶WF2-WF3笔石带和鲁丹阶LM2-LM3笔石带,厚度约11 m,与四川焦石坝和长宁地区相比,该区优质储层厚度偏薄。最后通过保存条件和经济性评价分析,认为鄂西宜昌东部斜坡区五峰组-龙马溪组页岩气保存条件相对较好,埋藏较浅,地质资源量超过1 200×108 m3,具有良好的勘探潜力。
中图分类号:
图4
宜昌地区五峰组-龙马溪组黑色岩系主要岩性镜下特征 a.粘土泥岩,纹层欠发育,有机质含量丰富,见极少量碎屑石英颗粒,龙马溪组,荷花横石村剖面;b.含少量粉砂粘土页岩,透镜状弱纹层断续分布,埋深1 422.8 m,龙马溪组,鄂宜页3井;c.粉砂质粘土页岩,暗色有机质呈层状分布,纹层发育,1 432.31 m,龙马溪组,鄂宜页3井;d.粉砂质泥岩,纹层较弱,黑色有机质断续分布,1 434.84 m,龙马溪组,鄂宜页3井;e.硅质泥岩,见硅质放射虫,部分可见放射虫刺,1 448.19 m,五峰组,鄂宜页3井;f.放射虫硅岩,见大量硅质放射虫及少量海绵骨针,部分放射虫比较完整,1 447.23 m,五峰组,鄂宜页3井;g.生物碎屑泥岩,见腕足及藻类化石,五峰组观音桥段,分乡王家湾剖面;h.斑脱岩,不含有机质,见少量硅质,纹层不明显,龙马溪组,黄花丁家坡剖面"
表1
宜昌地区五峰组-龙马溪组黑色页岩层系主要矿物分布特征"
地层 | 矿物含量/% | ||||||||
石英 | 长石 | 碳酸盐矿物 | 粘土矿物 | ||||||
统 | 组 | 阶 | 最小~最大 | 最小~最大 | 最小~最大 | 最小~最大 | |||
平均 | 平均 | 平均 | 平均 | ||||||
下志留统 | 龙马溪组 | 埃隆阶 | 18.26~68.83 | 3.14~18.13 | 0~16.19 | 7.54~75.13 | |||
40.41 | 7.62 | 3.23 | 45.84 | ||||||
鲁丹阶 | 44.45~93.78 | 1.74~15.6 | 0~5.46 | 0~46.28 | |||||
72.26 | 8.43 | 1.43 | 18.31 | ||||||
上奥陶统 | 五峰组 | 赫南特阶 | 42.5~86.01 | 4.17~11.85 | 0~8.13 | 9.82~32.67 | |||
68.43 | 7.79 | 2.25 | 20.45 | ||||||
凯迪阶 | 34.56~100 | 0~11.62 | 0~4.28 | 0~53.12 | |||||
73.54 | 5.74 | 1.56 | 19.46 |
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