Geological Age and Petrogenesis of Volcanic Rocks in Southern Chepaizi Oilfield

doi:10.7657/XJPG20220205

Abstract

Abstract:

The Carboniferous in southern Chepaizi oilfield is mainly composed of amygdaloidal basalt, basaltic andesitic agglomerate, andesitic breccia tuff and a small amount of basaltic andesitic breccia tuff. In order to determine the geological age of these rocks, isotopic and biofossil analyses were carried out, and then the analytical results were compared with the Carboniferous rocks in the outcrop area in the basin margin. It is found that there are abundant sporopollen fossils in the bottom of the Carboniferous sandstone in Well C47, and the zircon U-Pb age of the rhyolitic breccia-bearing vitric tuff from Well C68 is 314.6±2.1 Ma, suggesting that both the geological age and isotopic age of the volcanic rock are Late Carboniferous, which are comparable to the Hala’alat formation in the piedmont at the northwestern margin of the Junggar basin. The volcanic rocks are generally calc-alkali-tholeiitic series and relatively rich in Al₂O₃, with a weak positive Eu anomaly. Moreover, the volcanic rocks are strongly short of high field-strength elements such as Nb, Ta, and Hf, and relatively rich in large ion lithophile elements such as Ba, Rb, and K. There exists an obvious Nb-Ta trough, and the magma source area may be the depleted mantle of spinel peridotite because of metasomatism, and formed in the subduction-related island arc tectonic environment. For the well blocks in southern Chepaizi oilfield, the Carboniferous in the northwest wall of the large fault can be compared with the Aladeyikesai formation, and the volcanic rock formation in the southeast wall can be correlated with the Hala’alat formation in the piedmont of the northwest margin.

Key words: Chepaizi oilfield, Carboniferous, Hala’alat formation, volcanic rock, lithological characteristic, geological age, petrogenesis

CLC Number:

TE121.34

WANG Tao, XU Qian, LI Yongjun, KONG Yumei, ZHENG Menglin, GUO Wenjian. Geological Age and Petrogenesis of Volcanic Rocks in Southern Chepaizi Oilfield[J]. Xinjiang Petroleum Geology, 2022, 43(2): 160-168.

Figures/Tables 9

Fig. 1.

Table 1

Table 2

Fig. 2.

Table 3

LA-ICP-MS zircon U-Pb analysis results of rhyolitic breccia-bearing vitric tuff from Well C68"

测点编号	同位素比值						同位素年龄/Ma						元素含量/10^-6		Th/U
测点编号	²⁰⁷Pb/²⁰⁶Pb	1σ₁	²⁰⁷Pb/²³⁵U	1σ₂	²⁰⁶Pb/²³⁸U	1σ₃	²⁰⁷Pb/²⁰⁶Pb	1σ₁	²⁰⁷Pb/²³⁵U	1σ₂	²⁰⁶Pb/²³⁸U	1σ₃	Th	U	Th/U
1	0.057 0	0.002 5	0.390 6	0.018 3	0.049 7	0.000 7	500.0	98	334.8	13	312.8	4	227.13	322.21	0.70
2	0.053 8	0.001 7	0.368 9	0.010 1	0.050 0	0.000 8	361.2	70	318.8	7	314.4	5	238.50	454.08	0.53
3	0.054 5	0.001 8	0.377 2	0.013 5	0.050 2	0.000 8	390.8	74	325.0	10	315.5	5	235.70	489.40	0.48
4	0.057 4	0.002 5	0.398 1	0.020 4	0.050 2	0.001 1	509.3	101	340.3	15	315.6	7	202.43	315.29	0.64
5	0.052 0	0.002 4	0.358 3	0.015 6	0.050 0	0.000 6	287.1	99	311.0	12	314.8	4	239.20	498.20	0.48
6	0.060 2	0.002 2	0.415 6	0.015 3	0.050 0	0.000 6	609.3	80	352.9	11	314.8	4	404.18	603.24	0.67
7	0.059 6	0.002 1	0.411 6	0.013 7	0.050 4	0.001 4	587.1	77	350.0	10	317.2	8	285.26	507.87	0.56
8	0.052 9	0.001 9	0.365 1	0.014 4	0.050 0	0.000 6	324.1	85	316.0	11	314.5	4	281.27	614.34	0.46
9	0.053 3	0.002 1	0.368 6	0.015 4	0.050 0	0.000 5	342.7	87	318.6	11	314.3	3	153.89	381.56	0.40
10	0.063 5	0.003 9	0.437 4	0.025 5	0.050 2	0.000 8	724.1	131	368.4	18	315.8	5	223.21	366.61	0.61
11	0.053 4	0.001 8	0.368 3	0.011 3	0.050 2	0.000 8	346.4	42	318.4	8	315.6	5	341.31	638.00	0.53
12	0.051 0	0.002 3	0.353 6	0.018 6	0.049 9	0.000 7	242.7	71	307.4	14	314.0	4	203.52	447.16	0.46
13	0.055 7	0.002 6	0.382 6	0.017 6	0.049 9	0.000 8	438.9	104	328.9	13	313.9	5	203.73	422.14	0.48
14	0.058 2	0.002 6	0.400 8	0.017 5	0.049 9	0.000 8	538.9	96	342.2	13	314.1	5	191.05	414.25	0.46
15	0.060 8	0.002 8	0.420 8	0.024 4	0.050 1	0.001 9	631.5	98	356.6	17	315.4	12	299.36	536.18	0.56
16	0.051 7	0.001 8	0.356 2	0.013 8	0.050 1	0.001 3	333.4	81	309.4	10	314.9	8	210.59	477.19	0.44
17	0.050 2	0.002 1	0.345 5	0.013 5	0.050 0	0.000 8	211.2	96	301.4	10	314.7	5	327.66	582.50	0.56
18	0.050 8	0.001 5	0.350 2	0.010 1	0.050 0	0.000 5	231.6	69	304.9	8	314.7	3	529.03	686.01	0.77
19	0.061 0	0.002 8	0.423 5	0.020 2	0.050 2	0.000 8	638.9	72	358.6	14	315.7	5	123.49	310.50	0.40
20	0.054 3	0.001 6	0.374 5	0.010 5	0.050 2	0.000 8	388.9	67	323.0	8	315.6	5	355.57	502.31	0.71
21	0.053 1	0.002 0	0.366 3	0.013 9	0.050 0	0.000 7	344.5	81	316.9	10	314.8	4	184.37	378.56	0.49
22	0.056 5	0.001 6	0.391 1	0.011 0	0.050 2	0.000 7	472.3	95	335.2	8	315.8	4	376.27	699.60	0.54
23	0.058 2	0.002 0	0.400 9	0.013 2	0.050 0	0.000 6	538.9	76	342.3	10	314.6	4	138.27	337.35	0.41
24	0.055 7	0.002 2	0.384 1	0.015 8	0.050 1	0.000 9	438.9	87	330.1	12	314.9	6	136.57	328.21	0.42
25	0.049 9	0.001 8	0.343 5	0.012 5	0.050 0	0.000 8	190.8	114	299.8	9	314.3	5	186.22	374.35	0.50

Table 3

Fig. 3.

Fig. 4.

Fig. 5.

Fig. 6.

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车排子北部地区^[18]	车排子凸起^[19]	车排子凸起（新疆油田）		本文划分方案^[20]
车排子北部地区^[18]	车排子凸起^[19]	2013	2019	本文划分方案^[20]
希贝库拉斯组（C₂x）	哈拉阿拉特组（C₂h）	库吉尔台组（C₂k）	希贝库拉斯组（C₁x）	阿腊德依克赛组（C₂a）
希贝库拉斯组（C₂x）	哈拉阿拉特组（C₂h）	库吉尔台组（C₂k）	希贝库拉斯组（C₁x）	哈拉阿拉特组（C₂h）
包古图组（C_1-2b）	希贝库拉斯组（C₁x）	莫老坝组（C₂m）	包古图组（C₁b）	成吉思汗山组（C₂c）
包古图组（C_1-2b）	包古图组（C₁b）	莫老坝组（C₂m）	包古图组（C₁b）	希贝库拉斯组（C₁x）
太勒古拉组（C₁t）	太勒古拉组（C₁t）	太勒古拉组（C₁t）	太勒古拉组（C₁t）	包古图组（C₁b）

井名	石炭系深度/m	岩石组合	原划分方案	本文划分方案
CF13井	1 536—2 012	灰黑色含角砾玄武岩、玄武质火山角砾岩、玄武质角砾凝灰岩	包古图组	阿腊德依克赛组	上段
C26井	1 726—2 631	砾岩、含砾砂岩,夹少量岩屑砂岩、砂岩及泥岩夹层	石炭系	阿腊德依克赛组	下段
C498井	1 849—2 229	杏仁状玄武岩、玄武质角砾凝灰岩为主	石炭系	哈拉阿拉特组
C48井	2 967—3 200	安山质凝灰岩、玄武岩及玄武质角砾熔岩	石炭系
C477井	2 670—3 225	玄武质、安山质火山集块岩和火山角砾岩,中间夹薄层的凝灰岩	石炭系
C471井	2 621—3 332	杏仁状玄武岩、玄武质角砾熔岩、玄武安山质集块岩、安山质角砾凝灰岩、玄武质角砾凝灰岩	石炭系
C47井	3 370—3 490	灰色-灰黑色含碳砂岩、含砾岩屑砂岩	太勒古拉组
C47井	2 551—3 370	玄武质角砾熔岩、玄武质集块岩、安山质集块岩及少量玄武安山质角砾凝灰岩	太勒古拉组
C472井	2 434—3 010	气孔杏仁状玄武岩、灰绿色橄榄玄武质角砾熔岩、气孔杏仁状橄榄玄武岩、灰黑色蚀变安山质角砾凝灰岩、灰黑色含砾砂岩、灰黑色含砾泥岩	太勒古拉组
C68井	3 780—4 196	杏仁状玄武岩、安山质角砾熔岩、流纹质含角砾玻屑熔结凝灰岩及少量玄武质凝灰岩	太勒古拉组