高演化海相烃源岩元素地球化学评价: 以四川南江杨坝地区下寒武统为例

曹婷婷; 徐思煌; 周炼; 王约

doi:10.3799/dqkx.2014.019

高演化海相烃源岩元素地球化学评价: 以四川南江杨坝地区下寒武统为例

doi: 10.3799/dqkx.2014.019

曹婷婷^1,,
徐思煌^2, ,,
周炼³,
王约⁴

1.
中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214151
2.
中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074
3.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
4.
贵州大学资源与环境工程学院, 贵州贵阳 550003

基金项目:

中国石化股份有限公司海相油气勘探前瞻性研究项目 G0800-06-ZS-319

详细信息

作者简介:
曹婷婷(1986-), 女, 助理工程师, 主要从事油气成藏方面的研究.E-mail: caotingqi@sina.com

通讯作者:
徐思煌, E-mail: xusih@cug.edu.cn

中图分类号: P595
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- 被引次数: 0
出版历程
- 收稿日期: 2013-05-06
- 刊出日期: 2014-02-01

Element Geochemistry Evaluation of Marine Source Rock with High Maturity: A Case Study of Lower Cambrian in Yangba Section of Nanjiang County, Sichuan

Cao Tingting^1
,,
Xu Sihuang^{2
, ,},
Zhou Lian³,
Wang Yue⁴

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214151, China
2.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
College of Resources and Environmental Engineering, Guizhou University, Guiyang 550003, China

摘要

摘要: 评价高演化海相烃源岩已成为国内油气勘探的难点.尝试以四川南江杨坝地区下寒武统烃源岩为例, 利用元素地球化学参数建立高演化海相烃源岩评价的新方法.在计算得到与海洋自生有机质相关的自生元素含量基础上, 通过聚类分析将成因作用相同的自生元素聚为一类, 并建立指示有机质沉积环境及基本属性的参数与自生元素含量之间的线性关系, 从而优选出与有机质富集密切相关的自生元素, 并利用因子分析得到4个反映有机质从形成、沉积到埋藏过程中环境变化的主因子, 最终得到能够反映烃源岩的形成条件优劣的公式.依此对南江杨坝下寒武统烃源岩的品质进行划分.实践证明, 该方法可为高演化海相烃源岩的评价提供一些新思路.
- 海相烃源岩 /
- 元素含量 /
- 地球化学 /
- 石油地质 /
- 四川盆地
Abstract: How to evaluate the marine source rocks with high maturity is of crucial importance. Element geochemical indexes are used to build a new evaluating method for source rock in this study. In this paper, the samples are from the Lower Cambrian in Yangba section of Nanjiang County, Sichuan. We used the measured Xxs (a relative excess of X compared to titanium in post-Archean Australian shale), the authigenetic elements from the the same environment are treated as a class. Then, illustrate the linear relation between each of TOC, δ¹³C_carb and δ¹³C_org and the authigenetic elements from the same class, optimize the authigenetic elements that have closely relationship with enriched organic matter. Finally, the factor formula is built to indicate the changing of the quantity and quality of organic matter during the process of formation, deposition and burial according to the factor analysis. This formula is used to divide the rank of source rock quality of the Lower Cambrian in Yangba section. Thus, this geochemistry evaluation method would provide some new ideas for identifying and evaluating the marine high-maturity source rocks.
- marine source rock /
- element content /
- geochemistry /
- petroleum geology /
- Sichuan basin

HTML全文

图 1 四川南江杨坝地区地理位置及下寒武统地层柱状图

Fig. 1. Location and the stratigraphic column of the Lower Cambrian in Yangba area of the Nanjiang County, Sichuan basin

下载: 全尺寸图片幻灯片

图 2 各元素含量聚类分析结果

Fig. 2. Clustering analysis of element contents

下载: 全尺寸图片幻灯片

图 3 杨坝剖面因子分析综合得分及与TOC对照

Fig. 3. General factor scores and total organic carbon (TOC) from Yangba section

下载: 全尺寸图片幻灯片

表 1 四川盆地南江杨坝地区下寒武统微量元素分析(单位：10^-6)

Table 1. Element contents of the Lower Cambrian in Yangba area of the Nanjiang County, Sichuan basin

样品	Al	Ba	Ca	Fe	Mg	Mn	Mo	P	Sr	V	Cr	Co	Ni	Ti	Cu	Zn	Pb	U
74-1	18 311.92	718.93	2 310.99	2 6337.88	7 600.06	67.07	24.54	810.15	39.93	2 093.24	173.63	14.84	173.64	3 336.32	87.85	176.20	34.22	11.34
74-2	57 122.81	912.64	2 885.38	8 952.95	6 614.88	20.81	55.04	257.81	58.30	382.15	82.20	2.17	24.47	3 378.74	27.46	95.85	37.36	24.91
74-3	40 994.65	858.01	1 708.78	10 410.32	5 812.95	25.49	54.95	323.18	47.48	287.89	122.76	3.66	32.60	3 340.13	28.49	101.81	34.08	25.07
74-4	56 324.46	918.46	769.07	24 581.74	5 899.68	33.32	53.58	593.60	69.11	349.32	134.54	12.26	72.84	3 368.13	56.46	103.76	32.62	24.72
74-5	55 272.38	876.66	3 238.46	7 232.46	5 153.79	20.09	24.14	282.99	80.38	732.58	128.38	1.68	32.12	3 596.13	22.73	80.05	33.33	16.05
75-1	57 414.19	836.68	4 509.22	9 739.08	5 388.70	39.77	27.45	374.95	92.69	607.14	68.99	3.06	39.19	3 299.95	39.50	48.61	29.61	15.63
75-2	64 456.40	964.24	2 991.06	17 996.97	9 256.53	78.80	19.54	729.36	96.99	319.98	94.05	5.71	27.19	4 065.38	29.63	54.63	35.96	9.85
75-3	70 171.97	970.45	2 575.92	2 2487.61	7 794.50	77.09	23.08	217.15	104.21	272.93				4 183.46
76-1	52 129.31	766.52	50 628.92	17 371.01	11 233.02	361.08	2.14	882.92	278.85	202.86	40.74	9.05	32.56	2 598.25	28.89	77.47	23.66	3.26
76-2	57 501.44	854.39	56 378.93	19 797.91	14 061.61	484.43	4.59	360.14	278.97	176.94				3 161.22
76-3	59 160.01	657.89	54 135.56	24 533.53	13 087.24	432.77	1.66	297.37	290.89	208.77				3 201.74
76-4	56 450.49	605.54	58 549.42	22 645.55	13 143.51	401.87	9.73	716.80	331.69	285.13	99.11	12.09	47.25	2 521.45	44.42	98.62	29.32	2.72
78-1	62 218.59	792.86	58 357.98	24 787.53	15 566.32	464.96	2.11	352.65	309.00	200.66				3 689.52
78-2	66 023.00	1 251.82	38 017.48	24 466.55	14 560.26	363.74	2.82	448.83	177.20	204.21	86.85	11.33	35.00	4 013.27	23.82	119.83	15.03	2.60
78-3	55 241.60	768.26	44 170.99	23 978.29	15 677.99	373.26	0.92	818.40	237.53	242.76	123.11	11.95	40.75	3 726.03	32.21	91.92	30.98	2.83
78-4	55 592.27	1 233.01	30 112.52	24 552.79	15 471.64	322.47	1.11	1 107.54	153.10	245.90	57.12	11.78	45.26	3 858.59	35.29	109.61	34.82	2.93
79-1	54 717.39	1 032.75	65 307.42	20 005.02	12 458.63	384.04	1.19	1 013.45	285.03	187.46	104.72	9.81	33.63	3 249.72	25.66	76.67	30.42	2.80
79-2	53 799.53	971.63	46 584.41	19 523.29	14 101.06	331.05	0.38	695.01	201.13	213.33	91.13	9.67	36.46	3 283.30	525.61	80.84	21.24	2.45
80-1	236.01	4.95	176 037.75	375.13	69 497.90	170.05	0.24	20.69	53.32	2.09				8.34
80-2	59 323.20	1 010.61	67 342.15	23 347.54	15 211.03	459.92	0.64	326.89	276.28	208.18	94.89	12.75	37.59	3 632.86	22.11	81.31	10.37	2.33
80-3	63 773.86	954.82	40 135.84	19 992.66	15 197.50	256.16	0.00	800.75	191.22	169.09	88.52	10.35	37.83	3 109.09	26.46	56.13	29.69	3.76
81-1	56 681.63	711.98	71 083.53	20 987.49	14 962.35	406.16	0.19	744.74	299.72	172.61	93.52	10.10	37.71	2 842.89	28.90	57.78	23.89	2.86
81-2	56 935.43	856.51	61 284.29	18 872.45	13 084.17	433.95	1.49	370.85	252.75	184.37				3 338.60
82-1	63 208.65	725.78	33 088.18	24 119.31	15 125.80	398.48	0.85	359.10	171.80	216.80	101.12	12.77	33.48	3 407.09	21.57	119.96	10.80	2.60
83-1	58 112.68	942.40	9 792.60	9 754.76	4 392.54	31.67	19.03	227.69	90.82	209.79	96.02	2.92	26.88	3 021.73	9.69	71.58	16.96	10.11
84-1	43 109.77	507.06	4 844.37	26 116.84	8 029.09	1 131.80	1.33	468.94	57.91	171.96	84.92	8.49	36.96	1 765.39	10.40	57.32	6.73	2.64
85-1	43 927.96	346.49	6 069.88	58 916.35	10 838.91	2 083.94	0.32	980.03	52.01	188.22	67.76	14.33	45.61	1 781.74	13.89	64.68	4.35	2.66
87-1	61 972.26	592.21	30 982.40	22 305.71	11 883.75	578.07	1.30	418.44	141.23	237.30	80.65	10.08	42.13	2 735.22	24.07	80.42	10.76	2.84
89-1	76 409.51	651.29	31 199.57	30 816.78	15 021.97	534.94	0.51	431.05	116.67	341.22	130.17	15.23	55.28	3 826.44	41.47	144.24	13.82	3.84
90-1	66 184.84	804.65	63 227.76	29 257.54	17 091.67	903.76	0.95	411.60	279.63	292.72	114.36	18.78	52.54	3 344.50	31.93	130.53	13.36	3.70
91-1	58 859.62	737.08	45 105.99	27 189.14	17 881.54	664.57	0.00	979.94	218.98	265.50	89.17	16.88	60.80	3 282.37	46.94	154.52	30.09	3.83
91-2	72 102.61	620.98	40 704.63	28 151.32	19 596.14	643.86	1.77	418.80	170.92	294.89	125.50	14.17	52.61	3 714.92	41.06	167.37	11.08	3.81
92-1	71 358.78	614.19	49 854.76	26 277.86	18 132.10	734.60	1.70	387.02	207.70	264.69	120.51	14.90	50.21	3 705.36	32.22	131.18	24.13	3.56
93-1	53 663.14	549.16	40 388.09	26 986.94	16 760.33	523.36	0.01	1 073.50	162.62	257.71	127.70	15.63	58.28	3 131.69	46.65	101.23	27.39	3.81
93-2	65 486.26	721.13	39 125.69	27 645.99	14 407.53	499.68	0.91	394.43	171.99	273.45				3 085.42
94-1	71 812.32	563.59	55 264.39	28 612.82	18 089.83	665.67	0.99	395.21	227.45	288.40	113.53	15.28	51.09	3 425.48	37.65	97.76	85.83	3.62
95-1	54 634.36	825.56	50 174.07	21 201.51	13 215.59	574.42	1.17	357.66	209.82	213.65	110.85	11.10	35.24	2 796.97	22.24	71.79	9.22	3.04
96-1	50 843.49	352.92	106 001.54	20 858.46	16 063.63	1 108.38	1.72	919.19	281.34	209.86	87.68	12.56	46.34	2 402.16	28.57	83.13	24.71	5.44
96-2	53 027.61	356.63	101 835.29	21 138.99	14 219.87	1 036.84	1.20	307.07	276.54	205.96				2 180.76
97-1	55 159.30	449.73	46 581.49	26 387.24	21 725.80	610.46	0.00	1 024.85	113.40	276.40	115.17	15.80	58.46	3 227.12	60.54	112.34	31.09	4.24
97-2	39 241.06	442.48	43 178.59	34 751.69	13 209.74	736.98	1.39	488.34	171.64	156.48				1 451.44
97-3	48 345.59	515.02	38 648.38	42 816.58	14 764.29	705.96	0.51	514.73	123.24	200.25	92.95	37.18	53.08	2 446.57	11.82	71.47	8.12	3.10
98-1	57 090.22	387.04	58 014.87	21 600.16	16 982.66	692.24	1.03	329.27	151.40	230.51	86.30	11.39	36.24	2 752.53	22.31	78.38	9.04	2.94
99-1	32 030.56	339.83	119 146.12	11 276.28	10 077.69	709.39	0.10	506.44	252.20	105.14	47.98	5.68	24.40	1 204.77	24.04	93.22	26.81	1.64
99-2	27 184.69	315.72	121 900.16	9 338.35	8 259.89	750.82	0.69	148.21	234.98	83.60				931.79
100-1	6 770.10	50.50	308 308.71	6 195.89	5 935.22	2 090.84	0.81	703.17	398.92	28.82	30.26	4.65	10.83	291.82	6.63	23.64	30.84	4.18
101-1	35 760.31	355.01	79 418.72	11 095.55	11 350.52	417.54	0.75	799.25	151.65	126.44	119.38	7.99	33.97	1 375.54	24.62	60.67	26.46	1.93
101-2	39 538.18	363.42	81 123.16	13 592.57	9 098.73	449.26	1.63	323.01	154.31	148.96				1 753.42
102-1	2 813.22	26.92	268 198.64	4 232.58	27 313.19	636.10	0.67	37.56	237.83	9.40	22.26	1.32	5.01	70.97	10.36	49.08	4.34	0.43
103-1	4 317.48	28.21	324 713.05	3 535.66	21 507.85	471.90	1.00	81.55	298.35	17.07				136.46
103-2	8 480.69	56.68	278 286.33	4 858.26	20 035.16	458.63	0.41	240.82	358.28	36.05	31.08	2.56	14.54	371.02	36.29	58.40	26.43	1.16
103-3	2 019.33	31.14	285 574.76	5 339.96	21 895.77	723.55	0.20	59.87	240.47	12.80				96.54
104-1	16 232.08	1 498.97	195 059.00	6 329.54	9 878.70	381.84	1.04	112.94	254.62	48.61	44.81	2.37	10.37	562.77	26.70	50.43	12.22	0.90
105-1	20 589.66	126.09	229 374.88	8 252.18	27 529.26	448.51	0.00	276.25	286.48	74.71	46.14	3.53	20.25	869.76	14.95	44.83	26.30	1.04
106-1	22 341.54	147.36	202 388.72	9 907.26	28 216.31	556.89	0.51	121.17	200.05	77.58	39.66	7.08	21.03	876.74	10.37	25.93	12.76	1.14
107-1	10 446.32	53.12	195 484.01	4 520.13	16 504.13	338.00	2.45	324.66	272.84	31.88	15.94	2.09	16.61	432.04	17.11	150.28	26.73	1.50
107-2	12 346.11	61.00	275 538.43	5 010.06	7 542.89	421.81	0.48	134.65	279.98	45.75	37.07	3.02	11.93	503.26	50.70	45.83	7.82	0.84
108-1	7 837.58	42.39	254 612.25	5 345.90	24 445.81	597.38	1.92	189.96	230.11	27.53	38.78	2.15	20.10	251.23	50.05	104.89	27.71	1.10
108-2	3 128.77	26.33	262 448.11	4 285.21	36 369.38	1 080.59	0.68	41.48	356.88	12.99				101.74
111-1	34 765.87	1 537.80	35 589.84	13 485.53	16 873.74	1 696.68	1.29	192.38	119.42	106.63	118.30	5.24	16.90	1 419.81	10.06	42.27	11.45	1.39
112-1	28 304.77	1 896.47	46 260.31	8 167.04	10 039.90	1 022.13	0.73	235.99	123.94	78.38	63.37	3.30	9.14	1 068.04	16.51	24.14	16.62	1.95
112-2	71 835.42	573.95	3 419.12	31 134.68	14 302.92	299.70	0.74	340.65	56.92	306.61				3 286.43
113-1	88 320.71	745.62	4 536.81	33 174.44	17 440.93	344.40	0.48	387.21	40.09	397.24	151.61	13.83	60.28	4 039.31	80.11	136.43	9.69	3.72
114-1	25 208.55	5 349.92	26 578.95	12 887.44	4 148.49	831.10	1.18	187.22	207.32	87.53	107.20	2.45	11.29	1 305.08	368.25	32.98	8.80	1.03
115-1	49 948.08	1 943.83	17 998.89	28 777.93	13 249.77	948.27	1.55	313.32	133.34	196.27	73.91	7.53	30.30	2 220.69	34.79	71.20	13.51	2.39
115-2	51 882.26	1 767.57	4 346.38	13 929.31	7 601.42	291.67	0.97	188.81	93.31	140.60				1 812.62
116-1	77 523.56	585.46	5 954.79	38 612.82	15 613.05	373.91	0.83	359.77	73.92	334.07				3 918.09
116-2	36 122.88	1 596.41	9 121.35	14 869.47	4 421.69	582.90	0.87	159.73	106.30	94.06	124.62	11.48	49.26	1 225.81	20.97	115.07	9.90	3.45
117-1	27 547.03	407.46	1 614.50	3 153.48	1 127.51	74.73	0.78	89.27	41.53	55.59	148.62	1.37	4.89	638.22	7.77	22.45	8.41	0.69
118-1	42 342.84	487.03	5 821.14	15 163.87	6 609.89	366.78	1.20	242.52	64.40	127.32	52.43	5.68	20.96	1 478.58	99.76	63.13	8.85	1.52
119-1	36 438.26	410.26	4 190.80	11 316.75	4 528.78	109.23	1.42	481.58	68.61	109.18	106.16	5.59	17.60	1 268.68	25.18	43.51	9.27	1.46
120-1	27 758.09	386.67	1 985.32	11 443.64	3 581.33	97.15	1.82	169.61	35.31	82.50	157.03	4.22	15.60	1 183.75	7.60	39.53	6.45	1.13
121-1	45 764.40	588.71	2 941.32	17 258.12	6 555.05	149.79	1.16	225.14	44.83	153.92	54.66	6.99	26.55	2 035.03	6.43	46.61	7.57	2.07
122-1	48 025.33	601.85	1 858.54	18 505.90	5 438.69	126.88	0.80	169.70	47.27	138.23				1 795.92
123-1	33 049.74	427.62	13 955.57	14 767.47	9 733.51	258.52	0.91	173.19	55.18	128.93	44.80	5.91	18.48	1 676.33	25.76	37.87	6.85	1.85
124-1	13 568.25	297.00	1 422.04	10 979.86	2 319.56	213.74	1.41	132.48	22.68	53.92	31.89	2.82	8.92	746.24	10.67	30.27	8.86	0.92
125-1	35 045.75	1 557.52	10 024.23	17 363.48	4 988.92	128.26	2.24	1 546.34	73.14	98.45	36.23	6.70	19.91	1 198.62	136.93	49.92	7.19	3.20
125-2	21 951.10	675.46	2 819.16	12 823.45	3 522.35	101.66	0.88	254.69	38.43	72.10				778.41
125-3	82 439.46	896.26	5 478.86	27 212.28	12 605.86	217.55	1.34	261.53	69.87	261.41				4 083.40
127-1	43 917.99	532.75	2 515.54	14 944.49	5 763.83	236.63	1.28	211.19	52.45	124.44	116.05	6.73	23.29	1 884.09	8.77	42.68	7.38	1.54
129-1	95 380.96	730.91	2 839.81	36 304.27	15 174.80	347.09	0.89	215.56	67.93	353.48	123.29	18.28	56.96	4 073.50	49.96	109.06	7.68	3.75
130-1	6 945.30	350.99	3 036.85	37 474.79	1 158.21	53.62	2.38	508.78	32.89	85.33	33.85	1.64	5.73	411.69	13.61	17.13	4.03	2.19
130-2	73 839.20	724.93	2 920.21	31 475.62	14 472.81	257.93	0.67	268.17	50.50	269.23				3 907.33
130-3	8 236.40	797.05	7 591.92	32 250.42	3 659.25	182.15	4.34	1 224.50	74.69	136.78				475.43
131-1	45 463.72	800.76	1 782.68	23 279.61	11 597.82	176.44	1.07	493.96	36.83	177.42	60.28	10.73	42.47	2 820.29	36.76	73.87	25.99	2.27
132-1	18 573.41	260.40	62 876.95	5 332.66	31 982.94	259.94	0.33	112.74	51.86	47.50	25.49	1.19	4.13	750.30	6.17	14.12	36.54	1.14
133-1	19 994.86	266.12	60 471.77	4 607.20	35 124.70	236.76	0.35	270.60	46.14	44.79	96.94	1.52	13.38	1 001.10	15.68	26.66	24.19	1.08
133-2	5 934.51	59.34	172 391.19	5 923.37	65 845.86	564.51	1.09	22.94	71.66	20.65	31.86	1.66	6.12	168.92	6.14	55.55	14.14	1.42
134-1	4 477.52	54.12	163 086.18	3 480.67	76 899.24	422.71	0.00	50.51	51.82	10.25	20.11	0.84	11.19	178.08	11.00	24.54	28.36	0.34
135-1	9 650.35	868.12	168 924.77	6 155.98	67 028.75	520.92	0.40	43.65	69.11	26.90	65.85	1.54	5.78	407.94	7.84	17.23	14.90	0.48
136-1	5 464.71	47.19	108 038.66	3 099.90	49 593.50	330.46	0.30	28.46	43.57	22.60	37.35	1.40	3.34	207.13	5.72	15.36	7.58	0.98
137-1	12 612.59	312.16	154 657.10	7 152.78	63 113.29	533.89	0.17	70.25	59.25	48.77	21.34	2.50	9.49	502.82	8.60	22.44	13.79	1.41
139-1	18 429.21	3 769.75	100 174.55	4 931.22	49 204.81	355.11	1.01	105.03	96.83	43.03	37.28	1.37	4.64	825.44	5.20	35.09	7.84	1.34
140-1	23 201.78	282.20	47 794.39	5 860.66	28 089.45	190.13	0.79	144.17	34.20	73.19	68.19	2.89	7.17	1 546.64	10.03	20.28	15.70	1.58
141-1	2 148.20	41.50	185 523.00	3 719.97	70 734.62	447.00	1.23	29.15	66.30	14.08	14.60	0.91	4.08	85.09	5.07	26.12	10.40	1.10
注：表格中空白处表示无测试数据.

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表 2 旋转后的因子载荷矩阵

Table 2. Rotated component matrix

	主因子旋转载荷
	1	2	3	4
Mo_xs	0.863	0.212	-0.183	0.168
U_xs	0.855	0.229	-0.169	0.159
Fe_xs	-0.809	0.171	-0.023	0.183
Mn_xs	-0.597	-0.002	0.482	0.338
Ni_xs	-0.081	0.957	-0.098	-0.027
V_xs	0.277	0.810	-0.309	0.019
Zn_xs	0.074	0.725	0.357	-0.230
Sr_xs	-0.181	-0.077	0.921	-0.010
Ba_xs	0.032	-0.121	0.013	0.886
注：提取方法：主成分分析法；旋转方法：加入Kaiser常态化的方差最大旋转.

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表 3 因子得分系数矩阵

Table 3. Component score coefficient matrix

	主因子
	1	2	3	4
Ba_xs	0.032	0.011	0.019	0.855
Fe_xs	-0.399	0.148	-0.222	0.187
Mn_xs	-0.156	0.086	0.272	0.328
Mo_xs	0.348	0.047	0.072	0.184
V_xs	-0.004	0.350	-0.167	0.082
Ni_xs	-0.128	0.449	-0.067	0.048
Zn_xs	0.078	0.333	0.365	-0.166
U_xs	0.346	0.056	0.083	0.177
Sr_xs	0.159	0.014	0.763	-0.013

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