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鄂尔多斯盆地WL地区延长组储层成岩作用与孔隙结构差异成因

张芥瑜 张凤奇 刘阳 武富礼 闫凤平 谢冲 张兰馨

张芥瑜, 张凤奇, 刘阳, 武富礼, 闫凤平, 谢冲, 张兰馨. 鄂尔多斯盆地WL地区延长组储层成岩作用与孔隙结构差异成因[J]. 地质科技通报, 2023, 42(6): 162-173. doi: 10.19509/j.cnki.dzkq.tb20220607
引用本文: 张芥瑜, 张凤奇, 刘阳, 武富礼, 闫凤平, 谢冲, 张兰馨. 鄂尔多斯盆地WL地区延长组储层成岩作用与孔隙结构差异成因[J]. 地质科技通报, 2023, 42(6): 162-173. doi: 10.19509/j.cnki.dzkq.tb20220607
Zhang Jieyu, Zhang Fengqi, Liu Yang, Wu Fuli, Yan Fengping, Xie Chong, Zhang Lanxin. Causes of reservoir diagenesis and pore structure differences of the Yanchang Formation in the WL area of the Ordos Basin[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 162-173. doi: 10.19509/j.cnki.dzkq.tb20220607
Citation: Zhang Jieyu, Zhang Fengqi, Liu Yang, Wu Fuli, Yan Fengping, Xie Chong, Zhang Lanxin. Causes of reservoir diagenesis and pore structure differences of the Yanchang Formation in the WL area of the Ordos Basin[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 162-173. doi: 10.19509/j.cnki.dzkq.tb20220607

鄂尔多斯盆地WL地区延长组储层成岩作用与孔隙结构差异成因

doi: 10.19509/j.cnki.dzkq.tb20220607
基金项目: 

陕西省自然科学基础研究计划项目 2017JM4004

陕西省教育厅重点实验室科研计划项目 17JS110

详细信息
    作者简介:

    张芥瑜(1998—), 男, 现正攻读地质资源与地质工程专业硕士学位, 主要从事油气成藏方面的研究工作。E-mail: 1527641671@qq.com

    通讯作者:

    张凤奇(1981—), 男, 教授, 主要从事油气形成机制与油气成藏动力学的研究工作。E-mail: zhangfengqi68@126.com

  • 中图分类号: P618.13

Causes of reservoir diagenesis and pore structure differences of the Yanchang Formation in the WL area of the Ordos Basin

  • 摘要:

    为了明确低渗透-致密砂岩储层孔隙结构纵向上差异性的成因。以鄂尔多斯盆地WL地区为例, 利用物性测试、铸体薄片、扫描电镜、高压压汞等分析资料, 通过对研究区成岩相的划分和不同成岩相纵向分布差异的分析, 对延长组不同层系储层孔隙结构的特征、差异性及其成因进行了探讨。研究表明, 研究区延长组主力层系共发育5类孔隙结构, 在同一层系内和不同层系之间孔隙结构存在较大差异: 上组合长2和长3油层组主要发育Ⅲa、Ⅲb类孔隙结构; 中组合长4+5和长6油层组主要发育Ⅳa、Ⅳb类孔隙结构; 下组合长7、长8和长9油层组主要发育Ⅳb、Ⅴ类孔隙结构。随着埋深增加, 储层孔隙结构及孔渗条件整体上逐渐变差。研究区延长组储层发育4种成岩相类型, 孔隙结构的纵向差异主要受控于成岩相类型的差异分布: 上组合大气水淋滤主导的溶蚀作用强, 发育不稳定组分溶蚀相和绿泥石胶结相为主的成岩相类型, 形成的孔隙结构以相对较好类型为主; 中组合胶结作用强, 发育绿泥石胶结相和碳酸盐胶结相为主的成岩相类型, 形成的孔隙结构以中等类型为主; 下组合压实和胶结作用强, 发育碳酸盐胶结相和富软颗粒压实充填相为主的成岩相类型, 形成的孔隙结构以相对较差类型为主。研究结果可以为鄂尔多斯盆地三叠系延长组油气勘探开发提供有利指导。

     

  • 图 1  WL地区构造位置和延长组地层综合柱状图

    Figure 1.  Structural location of WL area and comprehensive histogram of Yanchang Formation stratum

    图 2  WL地区长2-长9油层组砂岩分类三角图

    Figure 2.  Sandstone classification triangle diagram of the Chang 2 to Chang 9 oil layers in the WL area

    图 3  WL地区延长组各层孔隙度、渗透率分布直方图

    Figure 3.  Distribution histogram of porosity and permeability of the Yanchang Formation in the WL area

    图 4  WL地区延长组储层孔隙类型面孔率

    Figure 4.  Average content map of pore types of the Yanchang Formation reservoir in the WL area

    图 5  WL地区延长组储层Ⅲa~Ⅴ类孔隙结构典型毛管压力曲线图

    Figure 5.  Typical capillary pressure curve of the types Ⅲa-Ⅴ pore structure of the Yanchang Formation reservoir in the WL area

    图 6  WL地区延长组储层孔隙结构压汞参数分布图

    Figure 6.  Mercury injection parameter distribution map of pore structure of Yanchang Formation reservoir in the WL area

    图 7  WL井区延长组各成岩相类型成岩序列图

    Figure 7.  Diagenetic sequence diagram of different diagenetic facies of the Yanchang Formation in the WL area

    图 8  WL地区延长组储层成岩作用类型及特征(蓝色与红色为铸体薄片孔隙)

    a.泥质岩屑、云母挤压变形,WL71井,4 97.2 m,长4+5,铸体薄片;b.方解石基底胶结,颗粒呈悬浮状,WL82井,1 249.4 m,长7,铸体薄片;c.绿泥石薄膜,WL91井,899.2 m,长6,铸体薄片;d.铁白云母胶结,WL34井,764 m,长2,铸体薄片;e.晚期铁方解石胶结,N194井,1 146.62 m,长8,铸体薄片;f.长石溶孔,石英次生加大,WL5井,1 437.6 m,长9,铸体薄片; g.浊沸石胶结,WL71井,497.27 m,长4+5,扫描电镜;h.叶片状绿泥石充填孔隙,WL87井,998.17 m,长6,扫描电镜;i.微晶石英、微晶长石,WL1井,1 437.60 m,长9,扫描电镜

    Figure 8.  Types and characteristics of diagenesis of Yanchang Formation reservoir in the WL area

    图 9  WL地区延长组成岩相测井识别

    Figure 9.  Diagenetic facies logging identification of the Yanchang Formation in the WL area

    表  1  WL地区长2到长9储层矿物成分统计

    Table  1.   Statistical table of mineral composition of the Chang 2 to Chang 9 reservoirs in the WL area

    层位 长2和长3 长4+5和长6 长7、长8和长9
    碎屑体积分数/% 石英 44.85 36.89 36.62
    长石 47.44 53.11 52.56
    火成岩岩屑 0.85 0.17 0.99
    变质岩岩屑 1.41 0.11 3.99
    沉积岩岩屑 0.17 0.61 0.67
    云母 1.57 5.33 4.31
    填隙物体积分数/% 泥质 1.34 1.56 3.64
    绿泥石 1.92 2.27 1.28
    方解石 0.84 1.00 1.43
    白云石 1.89 0.00 0.33
    自生高岭石 0.00 0.00 0.70
    浊沸石 0.74 0.17 0.00
    硅质 0.00 0.11 0.00
    泥铁质 0.00 0.22 0.00
    凝灰质 0.00 0.00 0.00
    下载: 导出CSV

    表  2  WL地区主要储层物性统计

    Table  2.   Statistical table of the main reservoir physical properties of the Yanchang Formation in the WL area

    层位物性 长2和长3 长4+5和长6 长7、长8和长9
    孔隙度/% 渗透率/10-3 μm2 孔隙度/% 渗透率/10-3 μm2 孔隙度/% 渗透率/10-3 μm2
    最大值 14.2 9.10 14.9 6.10 15.7 2.06
    最小值 8.2 0.30 3.8 0.10 1.1 0.03
    平均值 11.8 1.38 10.6 0.74 7.4 0.29
    样品数 15 15 94 94 143 143
    下载: 导出CSV

    表  3  WL地区储层孔隙结构综合评价结果

    Table  3.   Comprehensive evaluation results of reservoir pore structure in the WL area

    层位 微观孔隙结构/%
    a b a b Ⅴ类
    长2和长3 23.5 35.3 8.8 11.8 16.6
    长4+5和长6 0.0 11.1 30.2 33.4 25.3
    长7、长8和长9 0.0 10.7 16.1 42.9 34.3
    下载: 导出CSV

    表  4  WL地区储层成岩相综合评价结果

    Table  4.   Comprehensive evaluation results of diagenetic facies in the WL area

    层位 成岩相占比/%
    不稳定组分溶蚀相 绿泥石胶结相 碳酸盐胶结相 富软颗粒压实充填相
    长2和长3 50.00 33.29 0.00 16.71
    长4+5和长6 22.27 33.39 33.19 11.15
    长7、长8和长9 7.69 7.69 30.77 53.85
    下载: 导出CSV
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  • 收稿日期:  2022-10-25
  • 录用日期:  2022-11-09
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