0 引言
1 地质背景
2 实验样品和方法
3 热液活动分布特征
3.1 岩石学特征
图2 鄂尔多斯盆地靖边气田马家沟组五段热液活动的岩石学与矿物组合特征(a)不规则张性构造裂缝,被方解石充填,岩心,召54井,3 290.1 m;(b)白云岩中角砾状构造,岩心,陕50井,3 448.5 m;(c)白云岩中塑性拉伸构造,岩心,桃36井,3 292.75 m;(d)泥岩与侵入岩接触带,岩心,香1井,1 961.79 m;(e)不规则的碎裂缝,被热液矿物充填,岩心,香1井,1 964.72 m;(f)热液溶蚀孔洞,岩心,香1井,1 963.1 5 m;(g)零星分布的黄铁矿、黄铁矿和方解石共生充填溶孔,铸体薄片,陕52井,3 341.0 m;(h)溶缝中充填黄铁矿,岩心,桃36井,3 225.1 m;(i)黄铁矿、石英、方解石共生,铸体薄片,苏19井,3 523.36 m Fig.2 Petrology and mineral association characteristics of hydrothermal activity in the 5th member of Majiagou Formation, Jingbian Gas Field, Ordos Basin |
3.2 矿物组合特征
3.3 流体包裹体温度指示的热液活动
3.4 碳、氧、硫同位素指示热液异常
3.5 稀土元素及微量元素指示热液异常特征
图5 靖边气田马家沟组五段白云岩稀土元素配分模式和微量元素相关关系(a)白云岩样品稀土元素配分模式图;(b)白云岩样品Yb/La—Yb/Ca交会图;(c)白云岩中微量元素对比直方图; (d)白云岩样品Y—Eu相关关系图;(e)白云岩样品Pb—Th相关关系图;(f)白云岩样品Th—U相关关系图 Fig.5 Distribution pattern diagram of REE and correlation diagram of trace element of dolomite in the 5th member of Majiagou Formation, Jingbian Gas Field |
表1 靖边气田马家沟组五段碳酸盐岩稀土元素及微量元素数据 (10-6)Table 1 Data sheet of REE and trace element in the 5th member of Majiagou Formation in the Jingbian Gas Field |
井号 | 层位 | 深度/m | Rb | Y | La | Ce | Pr | Nd | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | Pb | Th | U |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
X9 | 马五4 | 3 295.27 | 6.452 | 4.770 | 4.543 | 10.179 | 1.252 | 5.165 | 1.206 | 0.243 | 1.038 | 0.152 | 0.858 | 0.160 | 0.419 | 0.056 | 0.359 | 0.051 | 1.247 | 1.215 | 1.019 |
X17 | 马五2 | 3 147 | 7.027 | 3.670 | 12.188 | 16.479 | 1.746 | 5.839 | 1.088 | 0.171 | 0.922 | 0.120 | 0.670 | 0.123 | 0.344 | 0.050 | 0.328 | 0.049 | 2.703 | 2.683 | 1.924 |
X15 | 马五1 | 3 222.3 | 8.406 | 3.407 | 3.902 | 8.106 | 0.929 | 3.590 | 0.751 | 0.148 | 0.708 | 0.105 | 0.602 | 0.119 | 0.330 | 0.045 | 0.307 | 0.046 | 1.232 | 1.447 | 0.999 |
X11 | 马五4 | 3 185.2 | 0.493 | 2.430 | 0.737 | 2.261 | 0.365 | 1.839 | 0.529 | 0.122 | 0.523 | 0.077 | 0.410 | 0.074 | 0.182 | 0.025 | 0.129 | 0.018 | 0.428 | 0.088 | 0.450 |
X26 | 马五2 | 3 518.4 | 1.061 | 2.953 | 1.946 | 3.915 | 0.550 | 2.514 | 0.722 | 0.150 | 0.673 | 0.089 | 0.488 | 0.086 | 0.215 | 0.028 | 0.166 | 0.025 | 0.798 | 0.234 | 0.280 |
X26 | 马五2 | 3 521.5 | 4.160 | 6.235 | 5.169 | 12.257 | 1.497 | 6.023 | 1.424 | 0.235 | 1.210 | 0.192 | 1.077 | 0.206 | 0.568 | 0.084 | 0.538 | 0.079 | 0.621 | 1.599 | 1.584 |
X20 | 马五1 | 3 325 | 2.095 | 2.839 | 2.502 | 6.204 | 0.769 | 3.081 | 0.673 | 0.119 | 0.589 | 0.089 | 0.502 | 0.097 | 0.252 | 0.036 | 0.219 | 0.032 | 0.457 | 0.562 | 0.637 |
X21 | 马五1 | 3 093 | 0.449 | 1.957 | 1.250 | 2.979 | 0.434 | 2.066 | 0.579 | 0.118 | 0.511 | 0.068 | 0.348 | 0.057 | 0.134 | 0.018 | 0.107 | 0.014 | 0.547 | 0.173 | 0.237 |
X19 | 马五1 | 3 137 | 1.456 | 3.756 | 6.436 | 10.789 | 1.433 | 5.281 | 1.003 | 0.138 | 0.869 | 0.116 | 0.616 | 0.115 | 0.309 | 0.046 | 0.312 | 0.049 | 0.960 | 0.412 | 0.217 |
X18 | 马五1 | 3 523.36 | 1.829 | 3.979 | 2.743 | 6.329 | 0.828 | 3.545 | 1.016 | 0.205 | 0.919 | 0.141 | 0.746 | 0.133 | 0.338 | 0.049 | 0.291 | 0.042 | 0.971 | 0.417 | 0.419 |
X23 | 马五2 | 3 459.48 | 4.826 | 2.970 | 2.683 | 5.560 | 0.665 | 2.636 | 0.675 | 0.146 | 0.658 | 0.093 | 0.492 | 0.091 | 0.227 | 0.032 | 0.197 | 0.027 | 0.890 | 0.796 | 0.743 |
X4 | 马五1 | 3 242.98 | 1.832 | 3.987 | 17.813 | 31.896 | 3.060 | 9.789 | 1.356 | 0.204 | 1.159 | 0.134 | 0.663 | 0.117 | 0.311 | 0.045 | 0.296 | 0.046 | 1.071 | 0.619 | 1.394 |
X12 | 马五1 | 3 098.7 | 3.937 | 3.312 | 3.460 | 7.484 | 0.914 | 3.831 | 0.911 | 0.194 | 0.812 | 0.104 | 0.582 | 0.108 | 0.287 | 0.040 | 0.252 | 0.036 | 1.748 | 1.243 | 0.752 |
X7 | 马五1 | 3 166.5 | 8.074 | 3.757 | 3.769 | 7.930 | 0.954 | 3.718 | 0.795 | 0.151 | 0.734 | 0.111 | 0.644 | 0.128 | 0.342 | 0.050 | 0.317 | 0.048 | 1.434 | 1.523 | 0.967 |
X1 | 马五4 | 3 286.83 | 5.907 | 3.825 | 3.245 | 7.033 | 0.910 | 3.752 | 0.892 | 0.166 | 0.793 | 0.118 | 0.681 | 0.130 | 0.339 | 0.048 | 0.289 | 0.043 | 1.032 | 1.063 | 0.733 |
X27 | 马五4 | 3 213 | 10.78 | 6.923 | 6.461 | 20.685 | 3.199 | 14.31 | 3.061 | 0.568 | 2.311 | 0.271 | 1.284 | 0.213 | 0.506 | 0.066 | 0.402 | 0.052 | 5.304 | 0.638 | 0.574 |
X8 | 马五2 | 3 376.4 | 1.105 | 2.075 | 1.242 | 3.006 | 0.404 | 1.766 | 0.497 | 0.103 | 0.461 | 0.066 | 0.335 | 0.065 | 0.155 | 0.021 | 0.124 | 0.017 | 0.652 | 0.316 | 0.972 |
X4 | 马五1 | 3 228.38 | 0.607 | 1.641 | 0.953 | 2.362 | 0.330 | 1.479 | 0.403 | 0.087 | 0.393 | 0.057 | 0.331 | 0.060 | 0.154 | 0.023 | 0.132 | 0.020 | 0.462 | 0.229 | 0.437 |
X2 | 马五2 | 3 384.72 | 1.152 | 2.028 | 1.158 | 2.577 | 0.352 | 1.676 | 0.492 | 0.099 | 0.413 | 0.064 | 0.354 | 0.065 | 0.168 | 0.023 | 0.148 | 0.022 | 1.240 | 0.163 | 0.228 |
X27 | 马五1 | 3 167.7 | 0.589 | 1.426 | 1.557 | 3.561 | 0.488 | 1.970 | 0.444 | 0.087 | 0.381 | 0.051 | 0.257 | 0.042 | 0.106 | 0.015 | 0.084 | 0.013 | 3.040 | 0.188 | 0.278 |
X6 | 马五2 | 3 044.9 | 2.093 | 1.903 | 1.793 | 4.013 | 0.533 | 2.305 | 0.566 | 0.095 | 0.458 | 0.062 | 0.341 | 0.058 | 0.146 | 0.021 | 0.129 | 0.018 | 0.532 | 0.419 | 0.465 |
X9 | 马五1 | 3 237.6 | 0.627 | 1.532 | 1.067 | 2.812 | 0.391 | 1.745 | 0.407 | 0.088 | 0.354 | 0.049 | 0.252 | 0.047 | 0.121 | 0.016 | 0.093 | 0.014 | 0.456 | 0.242 | 0.322 |
X14 | 马五4 | 3 365.6 | 0.903 | 1.691 | 1.014 | 2.470 | 0.342 | 1.591 | 0.403 | 0.083 | 0.368 | 0.052 | 0.279 | 0.051 | 0.120 | 0.015 | 0.084 | 0.012 | 0.391 | 0.175 | 0.622 |
X5 | 马五4 | 3 091.3 | 1.625 | 1.945 | 1.211 | 2.951 | 0.411 | 1.856 | 0.451 | 0.085 | 0.396 | 0.063 | 0.337 | 0.061 | 0.160 | 0.022 | 0.124 | 0.018 | 1.130 | 0.364 | 0.581 |
X22 | 马五1 | 3 249.6 | 1.454 | 1.955 | 1.444 | 3.136 | 0.405 | 1.785 | 0.420 | 0.086 | 0.402 | 0.059 | 0.338 | 0.063 | 0.154 | 0.021 | 0.125 | 0.018 | 1.339 | 0.453 | 0.919 |
X16 | 马五1 | 3 327.7 | 1.679 | 1.976 | 1.215 | 2.778 | 0.390 | 1.688 | 0.426 | 0.092 | 0.397 | 0.059 | 0.328 | 0.064 | 0.168 | 0.023 | 0.138 | 0.021 | 0.437 | 0.383 | 0.362 |
X14 | 马五1 | 3 315.3 | 1.236 | 1.731 | 1.285 | 2.755 | 0.357 | 1.502 | 0.337 | 0.071 | 0.321 | 0.049 | 0.280 | 0.054 | 0.146 | 0.020 | 0.123 | 0.018 | 1.054 | 0.439 | 0.707 |
X10 | 马五1 | 3 397.2 | 1.547 | 1.516 | 1.637 | 3.070 | 0.366 | 1.535 | 0.340 | 0.068 | 0.328 | 0.041 | 0.212 | 0.042 | 0.109 | 0.015 | 0.090 | 0.014 | 0.454 | 0.325 | 0.318 |
X11 | 马五4 | 3 149 | 1.642 | 1.222 | 1.285 | 2.661 | 0.348 | 1.528 | 0.350 | 0.063 | 0.303 | 0.039 | 0.201 | 0.038 | 0.093 | 0.013 | 0.076 | 0.012 | 0.445 | 0.307 | 0.689 |
X25 | 马五2 | 3 361 | 0.387 | 1.649 | 2.114 | 4.693 | 0.574 | 2.248 | 0.459 | 0.079 | 0.385 | 0.053 | 0.271 | 0.047 | 0.117 | 0.016 | 0.094 | 0.014 | 0.549 | 0.144 | 0.420 |
X25 | 马五4 | 3 398.5 | 2.008 | 1.594 | 1.086 | 2.468 | 0.338 | 1.508 | 0.387 | 0.078 | 0.351 | 0.051 | 0.274 | 0.048 | 0.131 | 0.018 | 0.107 | 0.015 | 0.539 | 0.368 | 1.213 |
X24 | 马五2 | 3 428.2 | 2.540 | 1.285 | 1.935 | 3.732 | 0.445 | 1.784 | 0.415 | 0.075 | 0.350 | 0.043 | 0.215 | 0.041 | 0.098 | 0.013 | 0.078 | 0.012 | 1.099 | 0.464 | 1.423 |
X21 | 马五1 | 3 342.1 | 0.683 | 0.964 | 1.583 | 3.158 | 0.381 | 1.482 | 0.306 | 0.052 | 0.256 | 0.035 | 0.176 | 0.030 | 0.072 | 0.010 | 0.056 | 0.009 | 0.660 | 0.139 | 0.263 |
X13 | 马五4 | 3 488.7 | 0.790 | 1.117 | 0.504 | 1.349 | 0.215 | 1.043 | 0.304 | 0.070 | 0.255 | 0.038 | 0.215 | 0.038 | 0.100 | 0.014 | 0.080 | 0.011 | 0.263 | 0.149 | 0.791 |
X3 | 马五4 | 3 294.99 | 0.752 | 1.294 | 0.651 | 1.617 | 0.236 | 1.099 | 0.286 | 0.074 | 0.272 | 0.039 | 0.232 | 0.043 | 0.103 | 0.016 | 0.084 | 0.012 | 0.233 | 0.105 | 0.623 |