塔东地区米兰1井寒武系白云岩成因及其对储层的影响

doi:10.11743/ogg20200506

Abstract

Abstract:

Knowing reservoir distribution pattern is key to the exploration of deep dolomite reservoirs in the eastern Tarim Basin.To understand the origin of the Cambrian dolomite in the Milan area of the Tadong low uplift, we measured the rare earth elements (REE) of dolomite of various types taken from a representative well Milan 1 for geochemical characterization based on core and thin section observations.The results show that the content of all REEs in various dolostones is low, and the total mass fraction decreases with the increase of grain size.There are obvious differences in δEu anomalies for dolostones of different types.The δEu anomaly values of silty-micritic, finely-crystalline, medium-crystalline and coarse-crystalline dolostones range between 0.97-1.08, 0.77-1.05, 0.80-3.23 and 0.81-2.23, respectively.Most of the samples have negative δCe anomaly values, ranging from 0.86 to 1.02.The results show that the PAAS-normalized pattern of REEs in all samples can be divided into three types:the negative, positive and normal types.An in-depth study on the dolomitization process demonstrates that the formation of the Cambrian dolomite is essentially caused by evaporation pump mechanism.In addition, the dolomite of the negative type was also under the impact of a burial environment at a later formation stage; the positive type was modified in a hydrothermal environment at a later stage; and the normal type was mainly formed under the effect of seepage reflux.In conclusion, the formation of dolomite reservoirs is conditioned by a variety of factors, including a favorable distribution of sedimentary facies as a prerequisite; large-scale dolomitization as the foundation; dissolution as the key, and the fracture systems as versatile influencers.

Key words: rare earth element (REE), geochemistry, dolomitization, dolomite, Cambrian, Well Milan 1, Tadong area, Tarim basin

CLC Number:

TE122.2

Chuntao Guo, Haiqiang Song, Jie Liang, Lingmei Ni. Origin of Cambrian dolomite from Well Milan 1 in Tadong area and its significance to dolomite reservoirs[J]. Oil & Gas Geology, 2020, 41(5): 953-964.

Figures/Tables 6

Fig.1

Fig.2

Table 1

Contents and characteristic parameters of REEs in the Cambrian dolomite from Well Milan 1, Tadong area"

样品编号	深度/m	岩性	稀土元素含量/10^-6													ΣREE/10^-6	ΣLREE//10^-6	ΣHREE//10^-6	ΣLREE/ΣHREE	δCe	δEu	δPr	(La/Yb)_N
样品编号	深度/m	岩性	La	Ce	Pr	Nd	Sm	Eu	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE/10^-6	ΣLREE//10^-6	ΣHREE//10^-6	ΣLREE/ΣHREE	δCe	δEu	δPr	(La/Yb)_N
ML-01	5 252.66	粗晶白云岩	17.982 9	33.692 9	3.216 3	11.547 7	1.676 4	0.421 4	0.163 9	0.967 5	0.215 2	0.608 9	0.085 0	0.486 0	0.065 3	71.129 4	68.537 6	2.591 8	26.44	1.01	1.52	0.95	2.73
ML-02	5 523.96	中-粗晶白云岩	5.180 0	8.610 0	1.019 0	3.680 0	0.539 0	0.196 0	0.051 0	0.280 0	0.050 0	0.157 0	0.021 0	0.114 0	0.016 0	19.913 0	19.224 0	0.689 0	27.90	0.86	2.23	1.06	3.35
ML-03	5 524.67	中-粗晶白云岩	1.865 7	3.232 3	0.366 4	1.573 1	0.324 0	0.070 7	0.039 6	0.230 7	0.051 1	0.152 4	0.018 7	0.096 3	0.010 3	8.031 3	7.432 2	0.599 1	12.41	0.90	1.20	0.95	1.43
ML-04	5 358.11	中-粗晶白云岩	0.732 6	1.465 3	0.178 4	0.711 9	0.182 2	0.025 9	0.020 5	0.167 0	0.038 6	0.109 1	0.013 5	0.070 8	0.007 7	3.723 5	3.296 3	0.427 2	7.72	0.93	0.81	1.03	0.76
ML-05	5 656.70	中晶白云岩	2.394 0	4.474 5	0.495 7	1.519 0	0.300 9	0.067 6	0.040 4	0.281 7	0.064 0	0.183 1	0.020 9	0.090 6	0.012 0	9.944 4	9.251 7	0.692 7	13.36	0.95	1.18	1.11	1.95
ML-06	5 356.35	中晶白云岩	1.196 6	2.443 6	0.294 5	1.306 1	0.274 5	0.041 3	0.036 2	0.264 0	0.061 3	0.178 1	0.023 8	0.138 6	0.014 6	6.273 2	5.556 6	0.716 6	7.75	0.95	0.79	0.96	0.64
ML-07	5 260.86	细-中白云岩	3.393 7	6.073 6	0.698 0	2.580 4	0.478 0	0.105 3	0.046 1	0.320 0	0.072 2	0.201 8	0.027 6	0.154 5	0.017 8	14.169 0	13.329 0	0.840 0	15.87	0.91	1.34	1.04	1.62
ML-08	5 253.90	细-中白云岩	9.941 0	16.918 0	1.624 0	4.795 0	0.961 0	0.493 0	0.136 0	0.661 0	0.128 0	0.347 0	0.049 0	0.299 0	0.041 0	36.393 0	34.732 0	1.661 0	20.91	0.96	2.62	1.04	2.45
ML-09	5 523.29	细-中晶白云岩	3.090 0	5.020 0	0.470 0	1.440 0	0.230 0	0.140 0	0.030 0	0.170 0	0.040 0	0.110 0	0.015 0	0.080 0	0.010 0	10.845 0	10.390 0	0.455 0	22.84	0.94	3.23	1.01	2.85
ML-10	5 523.72	细-中晶白云岩	4.324 4	8.666 1	0.886 0	3.280 6	0.521 4	0.157 3	0.042 8	0.274 1	0.060 8	0.171 1	0.020 7	0.108 8	0.011 9	18.526 0	17.835 8	0.690 2	25.84	1.02	1.95	0.98	2.93
ML-11	5 324.71	细-中晶白云岩	1.210 0	2.746 1	0.323 2	1.387 8	0.293 9	0.047 5	0.036 1	0.270 3	0.067 8	0.186 8	0.027 7	0.160 8	0.022 9	6.780 9	6.008 5	0.772 4	7.78	1.01	0.88	0.97	0.56
ML-12	5 253.90	细-粗白云岩	8.345 0	15.641 0	1.523 0	4.153 0	0.865 0	0.218 0	0.097 0	0.549 0	0.101 0	0.296 0	0.046 0	0.263 0	0.039 0	32.136 0	30.745 0	1.391 0	22.10	1.01	1.44	1.08	2.34
ML-13	5 252.78	细-粗晶白云岩	8.145 0	14.357 0	1.692 0	5.748 0	1.270 0	0.401 0	0.147 0	0.691 0	0.137 0	0.407 0	0.063 0	0.358 0	0.057 0	33.473 0	31.613 0	1.860 0	17.00	0.89	1.77	1.10	1.68
ML-14	5 289.13	细晶白云岩	8.264 6	16.003 2	1.993 5	8.277 9	1.741 9	0.269 7	0.202 8	1.308 7	0.243 8	0.752 3	0.101 4	0.660 1	0.096 0	39.915 9	36.550 8	3.365 1	10.86	0.91	0.87	1.01	0.92
ML-15	5 323.73	细晶白云岩	1.190 6	2.456 6	0.291 8	1.200 0	0.229 0	0.037 7	0.032 0	0.228 2	0.053 9	0.149 8	0.023 9	0.141 0	0.016 2	6.050 7	5.405 7	0.645 0	8.38	0.96	0.85	1.00	0.62
ML-16	5 355.97	细晶白云岩	1.328 9	2.992 3	0.393 2	1.680 6	0.330 8	0.051 8	0.043 0	0.294 1	0.070 1	0.198 9	0.026 4	0.140 2	0.015 3	7.565 6	6.777 6	0.788 0	8.60	0.95	0.83	1.02	0.70
ML-17	5 259.37	微-细晶白云岩	5.476 4	12.490 1	1.555 9	6.141 4	1.199 9	0.171 0	0.151 3	0.976 5	0.190 1	0.548 9	0.080 3	0.410 0	0.063 0	29.454 8	27.034 7	2.420 1	11.17	0.98	0.77	1.04	0.99
ML-18	5 356.49	微-细晶白云岩	1.596 0	3.202 0	0.383 0	1.513 0	0.308 0	0.060 0	0.062 0	0.348 0	0.077 0	0.213 0	0.032 0	0.171 0	0.027 0	7.992 0	7.062 0	0.930 0	7.59	0.94	0.82	1.02	0.69
ML-19	5 249.35	微-细晶白云岩	5.728 0	11.931 8	1.340 7	5.213 8	0.961 5	0.171 7	0.109 0	0.670 0	0.151 3	0.414 2	0.056 6	0.290 8	0.041 3	27.080 7	25.347 5	1.733 2	14.62	0.99	1.01	1.00	1.45
ML-20	5 249.83	微-细晶白云岩	8.858 3	16.884 2	1.893 0	6.445 0	1.187 3	0.233 2	0.154 3	0.939 3	0.219 2	0.615 1	0.098 7	0.576 7	0.076 6	38.180 9	35.501 0	2.679 9	13.25	0.95	1.04	1.07	1.13
ML-21	5 255.84	泥微晶白云岩	6.183 3	11.618 9	1.163 5	4.236 8	0.820 7	0.148 7	0.091 9	0.601 5	0.136 1	0.348 7	0.046 3	0.281 0	0.040 2	25.717 6	24.171 9	1.545 7	15.64	0.99	1.03	0.97	1.62
ML-22	5 250.81	泥微晶白云岩	7.434 4	16.694 4	1.934 4	7.109 0	1.434 9	0.245 9	0.162 2	1.070 2	0.223 9	0.593 5	0.071 7	0.406 0	0.061 2	37.441 7	34.853 0	2.588 7	13.46	1.01	0.97	1.04	1.35
ML-23	5 252.50	泥微晶白云岩	9.638 3	20.162 9	2.307 4	8.710 1	1.588 3	0.279 0	0.189 2	1.260 8	0.251 6	0.789 2	0.113 6	0.617 8	0.096 8	46.005 0	42.686 0	3.319 0	12.86	0.99	0.97	1.02	1.15
ML-24	5 658.19	泥微晶白云岩	2.502 5	4.980 1	0.561 2	2.086 2	0.357 6	0.076 4	0.055 4	0.390 7	0.094 0	0.264 5	0.039 0	0.169 0	0.023 5	11.600 1	10.564 0	1.036 1	10.20	0.97	1.04	1.02	1.09
ML-25	5 253.15	泥微晶白云岩	7.961 9	15.698 6	1.807 4	6.356 1	1.141 8	0.221 2	0.136 9	0.840 9	0.184 3	0.499 3	0.073 6	0.452 5	0.056 2	35.430 7	33.187 0	2.243 7	14.79	0.95	1.07	1.06	1.30
ML-26	5 258.72	泥微晶白云岩	2.911 3	6.092 3	0.677 8	2.565 9	0.478 0	0.092 4	0.056 5	0.324 5	0.074 4	0.219 1	0.027 4	0.143 2	0.018 3	13.681 1	12.817 7	0.863 4	14.85	1.00	1.08	1.01	1.50
ML-30	5 326.14	硅质中晶白云岩	1.438 0	3.251 1	0.377 7	1.515 9	0.348 1	0.047 1	0.038 6	0.252 7	0.061 7	0.182 6	0.026 4	0.140 2	0.019 1	7.699 2	6.977 9	0.721 3	9.67	1.02	0.77	1.00	0.76
ML-31	5 326.55	硅质中晶白云岩	0.745 2	1.589 8	0.192 3	0.789 4	0.173 2	0.025 1	0.018 4	0.139 8	0.035 2	0.101 0	0.013 1	0.078 3	0.010 1	3.910 9	3.515 0	0.395 9	8.88	0.97	0.85	1.01	0.70

Table 1

Fig.3

Fig.4

Fig.5

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Origin of Cambrian dolomite from Well Milan 1 in Tadong area and its significance to dolomite reservoirs

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