Volcanic activity stages and distribution during the Permian in the Shunbei area, Tarim Basin
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摘要: 顺北地区位于塔里木盆地中部顺托果勒低隆,该区为玄武岩与英安岩的叠合覆盖区,其二叠系火山岩期次及分布较塔河及塔中地区更难识别。通过对顺北地区27口井中二叠系火山岩的取心观察与采样,并进行薄片鉴定及地球化学元素分析,识别出玄武岩类、安山岩类、英安岩类、凝灰岩类和火山角砾岩类5种基本岩石类型。另外,依据二叠系火山岩的岩性组合与岩电特征对应关系,结合二叠系地震特征将火山活动细分为5个喷发旋回(或期次):第一期为中酸性火山碎屑岩沉积,以顺北三维区为中心;第二期为基性火山岩,分布主要受古地貌变化影响;第三、四期次火山主要为锥形、盾形中酸性火山熔岩,中间以稳定分布的火山沉积岩层为划分依据;第五期为基性火山熔岩,主要分布于研究区东部。Abstract: The Shunbei area, located in the Shuntuoguole Low Uplift in the central Tarim Basin, is covered by superimposed basalt and dacite, where volcanic activity stages in the Permian and areal distribution are more difficult to identify compared with those in the Tahe and Tazhong areas. Through core observations and sampling of Permian volcanic rocks from 27 wells in the Shunbei area, we carried out thin section identifications and geochemical element analyses. Five basic rock types were observed, including basalts, andesites, dacites, tuffs and volcanic breccias. In addition, the volcanic activity was subdivided into 5 eruption cycles (or periods) based on the lithology, the petrophysical log characteristics and the seismic characteristics of the Permian section. The first stage was an eruption of intermediate-acid pyroclastic rocks, with the eruption center located in the Shunbei 3D block. The second stage was an eruption of basic volcanic rocks, which was mainly controlled by paleotopo-graphy. The third and fourth stages featured cone-shaped and shield-shaped intermediate-acid volcanic lava, with stable volcanic sediments between the two stages. The fifth stage was an eruption of basic volcanic lava, which mainly distributed in the east of the study area.
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Key words:
- eruption stage /
- volcanic rock /
- Permian /
- Shunbei area /
- Tarim Basin
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图 2 塔里木盆地顺北地区二叠系火山岩镜下特征
a.X1-5H井,4 415 m,右侧单偏光、左侧正交偏光;辉石玄武岩,斑状结构,基质为长条状斜长石充填柱状及粒状辉石, 见蚀变橄榄石;b.X1-5H井,4 780 m,右侧单偏光、左侧正交偏光;玄武岩,无斑间粒结构,由辉石和斜长石小晶体组成,充填辉石和橄榄石(伊丁石化为红色);c.X1-5H井,4 430 m,右侧单偏光、左侧正交偏光;安山岩,斑状结构, 基质斜长石辉石、角闪石交织结构;d.X2井,4 530 m,右侧单偏光、左侧正交偏光;杏仁英安岩,斑状结构,绿色为杏仁结构充填绿泥石;e.X5-5H井,4 742.5 m,右侧单偏光、左侧正交偏光;英安岩,斑状结构,斑晶为斜长石及石英,见溶蚀边;f.X1-3井,4 700 m,右侧单偏光、左侧正交偏光;沉凝灰岩,碎屑物质含量大于90%,沉凝灰结构;g.X1-3井,4 725 m,右侧单偏光、左侧正交偏光;流纹质晶屑玻屑凝灰岩,假流动构造;h.X2井,4 848 m,右侧单偏光、左侧正交偏光;岩屑晶屑熔结凝灰岩,假流动构造
Figure 2. Microscopic characteristics of Permian volcanic rocks in Shunbei area, Tarim Basin
表 1 塔里木盆地顺北地区二叠系火成岩主量元素地球化学分析数据
Table 1. Geochemical data of primary elements of Permian igneous rocks in Shunbei area, Tarim Basin
% 样品号 深度/m SiO2 TiO2 Al2O3 Fe2O3 MnO MgO CaO Na2O K2O P2O5 烧失量 X1-3-1 4 530.0 56.42 1.18 14.81 8.09 0.19 2.34 3.73 2.55 3.83 0.16 6.74 X1-3-2 4 580.0 63.95 0.91 14.69 5.33 0.08 1.28 2.33 3.70 2.79 0.33 4.48 X1-3-3 4 700.0 60.31 0.64 15.99 5.85 0.07 1.40 1.72 2.76 3.56 0.15 7.37 X1-5H-1 4 430.0 56.82 1.27 14.86 8.82 0.12 3.74 5.30 2.94 1.63 0.22 4.20 X1-5H-2 4 700.0 60.75 0.78 16.29 6.97 0.11 1.58 1.95 2.82 3.96 0.24 4.36 X1-5H-3 4 760.0 60.29 0.62 13.25 5.49 0.07 1.29 5.41 2.44 4.07 0.17 6.94 X1-5H-4 4 790.0 58.31 1.37 13.08 8.41 0.13 1.98 5.00 2.45 3.26 0.31 5.62 X1-5H-5 4 925.0 59.98 0.57 13.20 5.31 0.06 1.73 5.00 1.89 3.87 0.15 8.09 X2-1 4 847.6 61.09 0.95 14.31 7.49 0.11 0.87 2.75 3.59 4.81 0.53 3.46 X2-2 4 962.4 44.78 3.95 15.23 14.21 0.21 5.68 4.28 3.93 0.91 1.22 5.54 X5-5H-1 4 742.0 59.29 0.56 14.04 6.57 0.10 0.58 2.11 3.22 4.79 0.29 8.45 X5-5H-2 4 742.6 58.10 0.51 12.57 6.75 0.19 0.45 2.22 3.02 4.46 0.29 11.44 X5-5H-3 4 743.0 55.43 0.47 13.26 8.55 0.09 0.54 1.97 3.02 4.45 0.26 11.96 S79-1 4 831.3 58.97 0.98 14.37 6.48 0.09 2.40 2.04 3.06 3.92 0.34 7.35 S79-2 4 864.1 55.34 0.54 14.32 7.15 0.14 1.93 5.99 2.38 3.59 0.28 8.34 表 2 塔里木盆地顺北地区二叠系岩性测井曲线响应特征数据统计
Table 2. Lithologic log curve response data of Permian in Shunbei area, Tarim Basin
测井曲线 玄武岩 英安岩 凝灰岩 砂岩 火山角砾岩 上段 下段 上段 下段 上段 下段 上段 下段 下段 GR/API 30~40 25~35 110~150 120~170 80~100 80~96 40~55 40~60 65~80 RT/(Ω·m) 10~100 10~100 20~40 20~40 0.8~3 1~7 0.5~2.0 0.5~1.5 1~3 AC/(μs·ft-1) 50~60 42~55 55~68 50~60 70~85 70~80 85~95 80~92 65~75 DEN/(g·cm-3) 2.55~2.75 2.60~2.75 2.45~2.55 2.5~2.55 2.28~2.4 2.35~2.55 2.12~2.35 2.15~2.35 2.40~2.55 CNL/% 5~15 5~15 6~10 6~10 25~30 44~124 25~33 15~30 10~20 表 3 塔里木盆地顺北地区二叠系火山岩活动期次划分特征
Table 3. Classification of Permian volcanic activities in Shunbei area, Tarim Basin
期次 岩性 钻遇井厚度/m 内幕反射特征 顶底界面反射特征 火山岩相 1 火山角砾岩、英安岩 300以下 内幕杂乱、弱反射 强反射波谷 爆发相—火山沉积相 2 玄武岩—凝灰岩组合 120以下 平行板状、弱反射 均为强反射波谷 溢流相—火山沉积相 3 英安岩—凝灰岩组合 350以下 杂乱强反射 顶界面强反射波峰,底界面强反射波谷 溢流相—火山沉积相 4 英安岩—凝灰岩—沉积岩组合 0~400 弱反射、楔形反射 顶界面强反射波峰,底界面强反射波谷 溢流相—火山沉积相 5 玄武岩为主,局部见凝灰岩 50~100 平行板状、强反射 强反射波谷 溢流相 -
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