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    鄂尔多斯盆地中生界低压油藏特征与形成机制

    段毅 曹喜喜 赵阳 张忠义 余永进 吴应忠 徐丽 何金先 夏嘉 张晓丽 赵彦德 齐亚林

    段毅, 曹喜喜, 赵阳, 张忠义, 余永进, 吴应忠, 徐丽, 何金先, 夏嘉, 张晓丽, 赵彦德, 齐亚林, 2014. 鄂尔多斯盆地中生界低压油藏特征与形成机制. 地球科学, 39(3): 341-349. doi: 10.3799/dqkx.2014.032
    引用本文: 段毅, 曹喜喜, 赵阳, 张忠义, 余永进, 吴应忠, 徐丽, 何金先, 夏嘉, 张晓丽, 赵彦德, 齐亚林, 2014. 鄂尔多斯盆地中生界低压油藏特征与形成机制. 地球科学, 39(3): 341-349. doi: 10.3799/dqkx.2014.032
    Duan Yi, Cao Xixi, Zhao Yang, Zhang Zhongyi, Yu Yongjin, Wu Yingzhong, Xu Li, He Jinxian, Xia Jia, Zhang Xiaoli, Zhao Yande, Qi Yalin, 2014. Characteristics and Formation Mechanism of Mesozoic Underpressured Reservoirs in Ordos Basin. Earth Science, 39(3): 341-349. doi: 10.3799/dqkx.2014.032
    Citation: Duan Yi, Cao Xixi, Zhao Yang, Zhang Zhongyi, Yu Yongjin, Wu Yingzhong, Xu Li, He Jinxian, Xia Jia, Zhang Xiaoli, Zhao Yande, Qi Yalin, 2014. Characteristics and Formation Mechanism of Mesozoic Underpressured Reservoirs in Ordos Basin. Earth Science, 39(3): 341-349. doi: 10.3799/dqkx.2014.032

    鄂尔多斯盆地中生界低压油藏特征与形成机制

    doi: 10.3799/dqkx.2014.032
    基金项目: 

    国家自然科学基金项目 41272125

    详细信息
      作者简介:

      段毅(1956-), 男, 博士, 研究员, 博士生导师, 主要从事油气地球化学、石油地质学和有机地球化学研究和教学工作. E-mail: duany@lzb.ac.cn

    • 中图分类号: TE122

    Characteristics and Formation Mechanism of Mesozoic Underpressured Reservoirs in Ordos Basin

    • 摘要: 首次对鄂尔多斯盆地中生界油藏压力进行了研究, 发现中生界油藏主要为超低压油藏, 并且不同地区和不同层位油藏的异常低压差别显著.研究结果表明, 随着地层剥蚀厚度增大和油藏抬升后温度降低值增加, 储层压力系数呈减少趋势; 延长组油藏抬升温度降低后使储层孔隙水的体积收缩量达0.82%~1.94%.这些指示了盆地在白垩纪末期长时间强烈抬升, 地层剥蚀和古地温降低作用是形成低压油藏的主要原因.认为鄂尔多斯盆地中生界这种低压封闭体系对油藏的保存有利, 同时对油藏调整、油气运移再富集和油水分布等成藏方面可能起到了重要作用.提出了陕北地区长6低压油藏由东南向西北方向富集和长7砂岩透镜体不含水低压油气藏形成, 均与这种低压封闭体系分布密切相关.

       

    • 图  1  长8储层压力系数等值线(a)和早白垩世末期地层剥蚀厚度等值线(b)

      Fig.  1.  Isopach map of pressure coefficients of Chang-8 reservoir rocks (a) and erosion thickness of strata in the end of Early Cretaceous (b)

      图  2  长8储层压力系数与地层剥蚀厚度相关图

      Fig.  2.  Cross plots of pressure coefficients of Chang-8 reservoir rocks vs. erosion thickness of strata

      图  3  中生界延安组和延长组储层水的平均总矿化度直方图

      Fig.  3.  Histogram of average total salinity of formation water in Yanan and Yanchang Formations

      图  4  峰7井中生界地层埋藏史

      Fig.  4.  Stratigraphic burial history of Mesozoic strata in well Feng 7

      图  5  长8储层压力系数与抬升前后油藏温度差值相关图

      Fig.  5.  Cross plots of pressure coefficients of Chang-8 reservoir rocks vs. differences before and after uplift of oil reservoir

      图  6  陕北地区长6储层异常负压分布

      Fig.  6.  Distribution of abnormal negative pressure of Chang-6 reservoir rocks

      图  7  长7油藏剖面图

      Fig.  7.  Chang-7 Oil reservoir profile

      表  1  鄂尔多斯盆地中生界油藏储层平均压力系数

      Table  1.   Mean pressure coefficients of Mesozoic reservoir rocks

      层位 马岭 姬塬 华庆 西峰 吴旗 陕北 平均值
      延10 0.93(1) 0.93(1)
      延安组 0.80(4) 0.80(4)
      长1 0.70(1) 0.86(1) 0.65(1) 0.74(3)
      长2 0.75(7) 0.81(5) 0.83(3) 0.71(4) 0.77(14)
      长3 0.71(16) 0.74(2) 0.71(18)
      长4+5 0.67(7) 0.69(2) 0.84(2) 0.72(11)
      长6 0.63(8) 0.69(5) 0.71(35) 0.70(48)
      长7 0.83(2) 0.70(1)
      长8 0.74(10) 0.76(16) 0.75(26)
      长9 0.75(1) 0.75(1)
      长10 0.79(1) 0.79(1)
      注:括号内数字为样品数;压力系数资料来自长庆油田,为实测数据.
      下载: 导出CSV

      表  2  m*值分布

      Table  2.   Distribution of m* values

      古峰庄 姬塬 白豹 西峰 洛川
      最大埋深(m) 3 015 3 150 3 300 3 000 3 015
      最大剥蚀厚度(m) 630 600 1 100 630 1 500
      最大残余厚度(m) 2 385 2 550 2 200 2 370 1 515
      最大剥蚀时m* 0.042 0.044 0.057 0.042 0.040
      下载: 导出CSV

      表  3  长7烃源岩最大古地温和延长组油藏二期成藏古地温

      Table  3.   The max paleogeothermal for Chang-7 source rocks and paleotempeature of the second stage of Yanchang Formation reservoir forming

      古峰庄 姬塬 白豹 西峰 洛川
      早白垩世长7烃源岩最大埋深(m) 2 800 2 850 2 950 2 300 2 000
      长7烃源岩生烃最大古地温(℃) 130 125 130 110 100
      二期成藏古温度(℃) 110 110 110 100 100
      注:长7烃源岩生烃最大古地温根据地层埋藏史和热演化史研究所获得;二期成藏古温度为储层包裹体均一温度.
      下载: 导出CSV

      表  4  鄂尔多斯盆地延长组各油层组油藏现今平均温度(℃)

      Table  4.   Average current temperature of Yanchang Formation (℃)

      层位 姬塬 华庆 西峰 吴旗 陕北
      长1 61.6(1) 38.6(3)
      长2 62.9(6) 51.5(6) 47.6(2) 31.5(14)
      长3 57.0(12)
      长4+5 69.9(5) 60.9(2) 44.8(4)
      长6 62.7(5) 57.5(7) 45.6(56)
      长7 59.6(1)
      长8 63.5(8) 66.1(11)
      长10
      平均 64.8 58.3 66.1 52.6 40.1
      T 45.2 51.7 33.9 59.9
      注:括号内数字为样品数;△T为成藏二期成藏温度与现今油藏平均温度之差,即油藏抬升后平均降低温度.
      下载: 导出CSV

      表  5  鄂尔多斯盆地延长组油藏储层孔隙水体积收缩百分含量(%)

      Table  5.   Pore volume shrinkage percentage contents for Yanchang Formation (%)

      层位 姬塬 华庆 西峰 陕北
      长2 1.49 1.94 1.47
      长3
      长4+5 1.13 1.59
      长6 1.28 1.21
      长8 1.33 0.82
      下载: 导出CSV
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