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川西龙门山前带雷口坡组四段古表生期大气水溶蚀作用对储集层的影响

李勇 邓美洲 李国蓉 高恒逸 王琼仙 何赛

李勇, 邓美洲, 李国蓉, 高恒逸, 王琼仙, 何赛. 川西龙门山前带雷口坡组四段古表生期大气水溶蚀作用对储集层的影响[J]. 石油实验地质, 2021, 43(1): 56-63. doi: 10.11781/sysydz202101056
引用本文: 李勇, 邓美洲, 李国蓉, 高恒逸, 王琼仙, 何赛. 川西龙门山前带雷口坡组四段古表生期大气水溶蚀作用对储集层的影响[J]. 石油实验地质, 2021, 43(1): 56-63. doi: 10.11781/sysydz202101056
LI Yong, DENG Meizhou, LI Guorong, GAO Hengyi, WANG Qiongxian, HE Sai. Palaeokarst characteristics and effects on reservoirs in the fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(1): 56-63. doi: 10.11781/sysydz202101056
Citation: LI Yong, DENG Meizhou, LI Guorong, GAO Hengyi, WANG Qiongxian, HE Sai. Palaeokarst characteristics and effects on reservoirs in the fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(1): 56-63. doi: 10.11781/sysydz202101056

川西龙门山前带雷口坡组四段古表生期大气水溶蚀作用对储集层的影响

doi: 10.11781/sysydz202101056
基金项目: 

国家科技重大专项“川西山前带潮坪相白云岩储层地震预测应用研究” 2017ZX05005-004-010

中国石化重大科技攻关项目“龙门山前雷口坡组气藏综合评价及开发技术政策研究” P16111

详细信息
    作者简介:

    李勇(1983-), 男, 硕士, 高级工程师, 从事碳酸盐岩气藏地质研究。E-mail: lycup0214@163.com

    通讯作者:

    邓美洲(1980-), 男, 硕士, 高级工程师, 从事油气藏开发地质研究。E-mail: dmzmaidy@126.com

  • 中图分类号: TE122.2

Palaeokarst characteristics and effects on reservoirs in the fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

  • 摘要: 川西龙门山前带雷口坡组四段主要岩石类型为潮坪相白云岩。该套白云岩储层的形成主要受沉积相带、白云化作用和溶蚀作用控制。利用岩心观察、薄片分析、激光碳氧同位素、探针微量元素、阴极发光及包裹体测温等实验手段,对溶蚀作用进行研究。研究表明该储层经历了3期溶蚀作用,即准同生期、古表生期和埋藏期,分别形成粒内溶孔及铸膜孔、膏溶孔洞以及沿裂缝或缝合线分布的溶蚀孔洞。深入研究古表生期岩溶作用和膏溶作用发现,印支Ⅰ幕大气水作用的识别标志有不规则网络状风化裂缝、岩溶及膏溶膏变角砾岩、保持石膏板状形态或直角边形态的去膏化方解石、广泛发育的膏模孔及膏溶孔洞,同时具有低的碳氧稳定同位素值、宽值域的锶同位素值、低含量的Sr-Mn-Fe-K-Na微量元素、低温单相水溶包裹体等地球化学特征,印支Ⅰ幕大气水作用下含膏白云岩内膏溶作用是储集层形成的关键作用。

     

  • 图  1  川西龙门山前带钻井分布和地层综合柱状图

    据文献[4]修改。

    Figure  1.  Borehole locations and stratigraphic sequence of Longmen Mountain front, western Sichuan Basin

    图  2  川西龙门山前带雷口坡组四段古表生期大气水溶蚀作用识别标志

    a.浅灰色微晶白云岩,岩心表面见网络状风化裂缝,A7井,4-5/45(岩心编号表示第4回次取心45块岩心中的第5块,下文相同含义),岩心照片;b.灰色微晶白云岩,不规则裂缝,A7井,4-4/45,普通薄片,单偏光,100-;c.灰色微晶白云岩,不规则裂缝内充填白云石泥,A7井,4-4/45,阴极发光,100-;d.膏溶膏变角砾岩,呈椭圆状,A5井,8-11/83,岩心照片;e.灰色膏溶膏变角砾岩,A2井,5-4/33,普通薄片,单偏光,100-;f.灰色膏溶膏变角砾岩,不发光,A2井,5-4/33,阴极发光,100-;g.含灰白云岩,见去膏化方解石,A1井,1-56/57,普通薄片,单偏光,50-;h.含云灰岩,A4井,4-59/66,普通薄片,单偏光,100-;i.含云灰岩,不发光,A4井,4-59/66,阴极发光,100-;j.藻云岩,顺层分布的膏模孔,A2井,10-10/45,岩心照片;k.藻砂屑云岩,孤立分布的孔洞,A5井,7-13/88,岩心照片;l.藻云岩,具有直角边的膏溶孔,蓝色为灌注的铸体,代表储集空间,A2井,10-43/45,铸体薄片,100-

    Figure  2.  Identification of palaeokarst in fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

    图  3  川西龙门山前带雷四段成岩演化序列

    Figure  3.  Diagenetic sequences of fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

    图  4  川西龙门山前带雷四段古表生期(印支期Ⅰ幕)大气水溶蚀作用成储模式

    Figure  4.  Reservoir formation model of atmospheric water denudation in epidiagenetic period (in episode I of the Indosinian Movement), fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

    表  1  川西龙门山前带雷四段古岩溶产物地球化学特征

    Table  1.   Geochemical characteristics of palaeokarst deposits in fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

    序号 井号 岩心块号 产状 δ13CPDB/‰ δ18OPDB/‰ 锶同位素87Sr/86Sr K/(μg·g-1) Na/(μg·g-1) Sr/(μg·g-1) Mn/(μg·g-1) Fe/(μg·g-1) 均一法温度/℃ 冰点/℃ 盐度/%
    1 A7 2-4/22 0.69 -5.67 0.707 807 60 251
    2 A7 2-14/22 1.18 -5.48 0.707 863 66 < 0.01 0.02 985 23 0.01
    3 A2 6-12/54 0.77 -7.67 0.707 916 76 < 0.01 0.04 94.4 7 0.11 126.1 -9.0 12.9
    4 A2 7-16/29 -0.15 -6.77 0.34 0.48 62.8 < 5 0.27 115.1 -6.9 10.4
    5 A2 9-19/49 1.59 -6.63 0.708 076 72 < 0.01 0.02 274 11 < 0.01 122.4 -9.4 13.3
    6 A2 9-49/49 0.85 -7.93 0.709 386 24 0.01 0.05 256 < 5 0.02 129.1 -6.9 10.4
    7 A8 2-19/44 0.97 -5.18 0.01 0.06 214 < 5 0.03
    8 A5 4-15/58 -0.38 -8.55
    9 A5 4-28/58 0.35 -7.71 0.708 451 31 < 0.01 0.04 972 < 5 0.01 116.4
    10 A5 4-56/58 0.69 -8.89 0.708 125 90 196.5
    11 A5 5-25/67 -1.07 -7.61 328 113.4 -10.6 14.6
    12 A5 6-49/79 0.90 -9.01 < 0.01 0.08 81.9 < 0.01 123.2
    13 A5 6-55/79 0.07 -8.36 < 0.01 0.04 218 < 5 0.01
    14 A6 2-21/60 0.67 -7.31 0.707 789 16 130.1
    15 A1 1-56/57 1.17 -6.23
    16 A2 1-54/67 1.67 -7.44
    17 A2 4-45/60 0.63 -7.46 0.708 392 08 < 0.01 0.03 322 < 5 0.01
    18 A2 8-14/33 0.83 -7.79 0.708 569 25 < 0.01 0.02 143 5 < 0.01
    19 A5 1-68/76 0.85 -8.96 < 0.01 0.05 146 < 5 0.01 114.0
    20 A5 7-77/88 0.37 -7.42 0.708 293 81 478 137.2 -6.5 9.9
    21 A5 8-11/83 -2.30 -8.86
    22 A5 8-14/83 1.23 -6.58 0.708 296 66 < 0.01 0.01 266 11 0.01
    23 A2 2-22/66 1.46 -5.94 0.707 923 88 246
    24 A2 2-35/66 1.11 -5.91 0.708 129 75 244
    25 A7 3-1/26 -0.26 -7.30
    26 A5 2-57/73 1.37 -6.41 0.708 008 81 < 0.01 0.02 271 7 < 0.01
    27 A5 2-57/73 1.40 -6.50 0.708 239 04 < 0.01 0.02 264 7 < 0.01
    28 A5 2-60/73 1.47 -6.29
    29 A6 1-37/73 1.86 -5.00 0.708 171 04 < 0.01 0.03 262 11 < 0.01
    30 A8 6-30/75 1.74 -2.73 0.707 923 77 3 050
    注:“产状描述”中,①指代微晶灰岩;②指代亮晶砂屑灰岩;③指代去膏化方解石;④指代膏溶孔洞方解石;⑤指代印支期Ⅰ幕的低角度裂缝方解石;⑥指代构造裂缝纤柱状方解石(印支期Ⅰ幕);⑦指代受热液改造的高角度裂缝纤柱状—粒状方解石。
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  • 收稿日期:  2020-08-20
  • 修回日期:  2021-01-03
  • 刊出日期:  2021-01-28

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