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潜江凹陷盐间页岩油储层孔隙结构分形表征与评价

孙中良 王芙蓉 韩元佳 侯宇光 何生 郑有恒 吴世强

孙中良, 王芙蓉, 韩元佳, 侯宇光, 何生, 郑有恒, 吴世强. 潜江凹陷盐间页岩油储层孔隙结构分形表征与评价[J]. 地质科技通报, 2022, 41(4): 125-137. doi: 10.19509/j.cnki.dzkq.2021.0063
引用本文: 孙中良, 王芙蓉, 韩元佳, 侯宇光, 何生, 郑有恒, 吴世强. 潜江凹陷盐间页岩油储层孔隙结构分形表征与评价[J]. 地质科技通报, 2022, 41(4): 125-137. doi: 10.19509/j.cnki.dzkq.2021.0063
Sun Zhongliang, Wang Furong, Han Yuanjia, Hou Yuguang, He Sheng, Zheng Youheng, Wu Shiqiang. Characterization and evaluation of fractal dimension of intersalt shale oil reservoirs in Qianjiang Depression[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 125-137. doi: 10.19509/j.cnki.dzkq.2021.0063
Citation: Sun Zhongliang, Wang Furong, Han Yuanjia, Hou Yuguang, He Sheng, Zheng Youheng, Wu Shiqiang. Characterization and evaluation of fractal dimension of intersalt shale oil reservoirs in Qianjiang Depression[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 125-137. doi: 10.19509/j.cnki.dzkq.2021.0063

潜江凹陷盐间页岩油储层孔隙结构分形表征与评价

doi: 10.19509/j.cnki.dzkq.2021.0063
基金项目: 

国家科技重大专项 2017ZX05049-005

国家自然科学基金项目 41772143

国家自然科学基金重点项目 41830431

详细信息
    作者简介:

    孙中良(1993-), 男, 助理工程师, 主要从事非常规油气研究工作。E-mail: 995974375@qq.com

    通讯作者:

    王芙蓉(1979-), 女, 副教授, 主要从事储层沉积和成岩作用等方面的研究工作。E-mail: wfr777@163.com

  • 中图分类号: P618.13

Characterization and evaluation of fractal dimension of intersalt shale oil reservoirs in Qianjiang Depression

  • 摘要:

    目前, 众多学者从地球化学特征、储层物性特征等方面对潜江凹陷潜江组页岩展开了较多研究, 并取得了一定的进展, 但对其孔隙的复杂性、形成孔喉的主要矿物及其影响因素的分析存在盲点。依据分形理论, 结合氮气吸附实验、高压压汞实验, 选取沉积位置不同的BX7井以及BYY2井, 分别对潜三段第四亚段(Eq34-10)页岩的比表面分形特征、孔隙结构分形特征以及孔喉分形特征进行了评价, 分析了其影响因素。结果表明, 该地区的孔隙表面较为平整, 比表面分形维数D1趋近于2, 孔隙表面的粗糙程度主要受黏土矿物本身特性影响。相较于沉积边缘的BX7井, 位于沉积中心的BYY2井储层孔隙结构分形特征更为简单。小孔径孔隙的孔体积所占比例越大, 孔隙结构分形特征越复杂。BX7井储层孔隙结构分形维数D2主要受黏土矿物以及石英的影响, 而BYY2井储层孔隙结构分形维数D2主要受白云石的影响。白云石为构成BX7井储层孔喉的主要矿物, 随白云石增加, 孔喉特征复杂, 连通性变差。BYY2井储层中石英形成的孔喉直径较小, 石英的增加会使孔隙连通性变差; 方解石形成的孔喉直径较大。页岩油的赋存会使孔隙的分形维数变小, 对孔喉分形特征的影响较小。盐类矿物的存在会阻塞孔隙, 使孔隙连通性变差。

     

  • 图 1  潜江凹陷沉积相及取样位置图

    Figure 1.  Sedimentary facies and sampling location of Qianjiang Depression

    图 2  潜江凹陷潜江组Eq34-10韵律页岩样品孔隙类型及有机质赋存状态

    A.层间孔,粒间孔,BX7井,3 046.98 m;B.层间孔,粒间孔,BX7井,3 055.32 m;C.溶蚀孔,BX7井,3 046.98 m;D.有机质在粒间孔以及层间孔内赋存,BX7井,3 055.32 m;E.白云石晶间孔,BYY2井,2 817.11 m;F.粒间孔,BYY2井,2 817.51 m;G.白云石晶间孔,BYY2井,2 817.51 m;H.有机质在白云石晶间孔内赋存,BYY2井,2 814.67 m;I.有机质在粒间孔内赋存,BYY2井,2 817.11 m

    Figure 2.  Pore types and organic matter occurrence state of Qianjiang Formation Eq34-10 rhythmic shale samples in Qianjiang Depression

    图 3  潜江凹陷潜江组Eq34-10韵律页岩样品抽提前后低温氮气吸附曲线特征

    Figure 3.  Characteristics of low-temperature nitrogen adsorption curve before and after extraction of Qianjiang Formation Eq34-10 rhythmic shale samples in Qianjiang Depression

    图 4  潜江凹陷潜江组Eq34-10韵律页岩样品抽提前后比孔容、比表面积变化柱状图

    Figure 4.  Histograms of specific pore volume and specific surface area before and after extraction of Qianjiang Formation Eq34-10 rhythmic shale samples in Qianjiang Depression

    图 5  潜江凹陷潜江组Eq34-10韵律页岩样品抽提前后压汞曲线特征

    Figure 5.  Mercury injection curve characteristics before and after extraction in Qianjiang Formation Eq34-10 rhythmic shale samples in Qianjiang Depression

    图 6  潜江凹陷潜江组Eq34-10韵律页岩样品抽提前后不同孔径进汞量分布曲线

    Figure 6.  Distribution curve of mercury intrusion in different pore sizes of before and after extraction in Qianjiang Formation Eq34-10 rhythmic shale samples in Qianjiang Depression

    图 7  由N2气体吸附等温线重建的lnV和ln(ln(P/P0))图

    Figure 7.  Plots of lnV and ln(ln(P/P0)) derived from N2 gas adsorption isotherms

    图 8  由高压压汞数据重建的lnS和lnr

    Figure 8.  Plots of lnS and lnr obtained from high-pressure mercury injection data

    图 9  江汉盆地潜江凹陷潜江组Eq34-10韵律BX7井页岩样品矿物成分对孔隙分形维数的影响

    Figure 9.  Influence of mineral composition on pore fractal dimension of shale samples from Well BX7 in Eq34-10 rhythm of Qianjiang Formation, Qianjiang Depression, Jianghan Basin

    图 10  江汉盆地潜江凹陷潜江组Eq34-10韵律BYY2井页岩样品矿物成分对孔隙分形维数的影响

    Figure 10.  Influence of mineral composition on pore fractal dimension of shale samples from Well BYY2 in Eq34-10 rhythm of Qianjiang Formation, Qianjiang Sag, Jianghan Basin

    图 11  江汉盆地潜江凹陷潜江组Eq34-10韵律BX72井页岩样品矿物成分对孔喉分形维数(D3)的影响

    Figure 11.  Influence of mineral composition on fractal dimension (D3) of pore throat of shale samples from Well BX72 in Eq34-10 rhythm of Qianjiang Formation, Qianjiang Sag, Jianghan Basin

    图 12  江汉盆地潜江凹陷潜江组Eq34-10韵律BYY2井页岩样品矿物成分对孔喉分形维数(D3-1, D3-2)的影响

    Figure 12.  Influence of mineral composition on fractal dimension (D3-1, D3-2) of pore throat of shale samples from Well BYY2 in Eq34-10 rhythm of Qianjiang Formation, Qianjiang Depression, Jianghan Basin

    图 13  江汉盆地潜江凹陷潜江组Eq34-10韵律页岩样品盐类矿物对孔隙分形维数的影响

    Figure 13.  Influence of salt minerals on fractal dimension of pore throat of shale samples in Eq34-10 rhythm of Qianjiang Formation, Qianjiang Depression, Jianghan Basin

    表  1  BX7井以及BYY2井样品矿物成分特征

    Table  1.   Mineral composition characteristics of samples from Wells BX7 and BYY2

    样品 深度/m w(TOC)/% 黏土 石英 长石 方解石 白云石 黄铁矿 石膏 硬石膏 石盐 钙芒硝
    wB/%
    BX7-1 3 046.490 2.070 21.96 12.60 16.53 14.59 31.90 2.43 \ \ \ \
    BX7-2 3 046.980 2.870 13.47 18.88 17.42 20.22 27.32 2.69 \ \ \ \
    BX7-6 3 049.020 1.400 18.13 22.47 13.02 30.27 14.43 1.68 \ \ \ \
    BX7-11 3 051.820 1.010 6.44 9.58 4.79 10.19 66.08 2.92 \ \ \ \
    BX7-15 3 053.720 2.430 37.87 25.42 10.27 8.74 11.56 3.72 2.43 \ \ \
    BX7-18 3 055.320 0.815 5.53 17.11 16.28 25.78 33.36 1.94 \ \ \ \
    BX7-25 3 060.110 0.969 8.24 8.11 20.47 13.65 46.73 2.80 \ \ \ \
    BYY2-21 2 814.450 1.830 9.13 13.87 21.37 36.25 15.17 1.94 \ \ 2.27 \
    BYY2-90 2 817.105 2.440 19.96 8.60 28.35 5.17 29.71 2.68 \ 3.59 1.95 \
    BYY2-101 2 817.505 2.050 19.64 8.40 30.39 13.49 22.13 1.68 \ \ 0.85 3.43
    BYY2-161 2 820.230 1.150 15.50 9.52 20.54 1.60 44.38 1.70 2.43 2.11 2.22 \
    下载: 导出CSV

    表  2  基于N2气体吸附以及高压压汞数据重建计算分形维数值

    Table  2.   Calculation of fractal dimension values based on N2 gas adsorption and high-pressure mercury injection data

    样品 氮气吸附实验 高压压汞实验
    D1 D2 D3
    BX7-1 抽提前 2.100 5 2.284 9 2.829
    抽提后 2.358 4 2.579 0 2.898
    BX7-2 抽提前 2.097 0 2.383 8 2.824
    抽提后 2.348 5 2.641 7 2.828
    BX7-6 抽提前 1.743 6 2.513 3 2.883
    抽提后 2.407 2 2.659 5 2.886
    BX7-11 抽提前 / / 2.844
    抽提后 / / 2.955
    BX7-15 抽提前 1.807 6 2.491 8 2.745
    抽提后 2.483 9 2.676 3 2.790
    BX7-18 抽提前 1.975 9 2.269 6 2.811
    抽提后 2.241 3 2.561 9 2.821
    BX7-25 抽提前 1.736 4 2.283 4 /
    抽提后 2.359 6 2.538 0 /
    样品 氮气吸附实验 高压压汞实验
    D1 D2 D3-1 D3-2
    BYY2-21 抽提前 1.792 1 2.258 5 2.89 2.76
    抽提后 2.386 4 2.344 1 2.96 2.89
    BYY2-90 抽提前 1.861 2 2.272 6 2.98 2.71
    抽提后 2.384 1 2.384 8 2.88 2.80
    BYY2-101 抽提前 2.033 1 2.190 0 2.77 2.84
    抽提后 2.415 1 2.345 6 2.80 2.88
    BYY2-161 抽提前 1.744 9 2.326 6 2.90 2.88
    抽提后 2.286 1 2.403 1 2.91 2.78
    下载: 导出CSV
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  • 收稿日期:  2021-03-21
  • 网络出版日期:  2022-09-07

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