Formation time and fluid source of calcite veins and geological significance: An example from the Triassic Qinglong Formation carbonate reservoirs in the Huangqiao area, Subei Basin
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摘要:
裂缝方解石脉是构造成岩作用的产物, 记录了裂缝开启和流体活动的信息。基于岩石薄片观察、阴极发光和U-Pb同位素定年在厘清苏北盆地黄桥地区三叠系青龙组碳酸盐岩中方解石脉发育期次和形成时间, 通过稀土元素特征, C、O、Sr同位素特征综合分析了方解石脉体成脉流体来源。结果表明: 黄桥地区青龙组发育4期方解石脉体, 4期方解石脉体形成时间分别为(115.30±0.42), (97.03±0.43), (85.29±0.25), (45.5±19.0) Ma。第1和第2期方解石成脉流体分别来源于深部热液流体和大气淡水以及海水的混合流体。第3期方解石成脉流体来源于同层地层水和深部壳源热液流体的混合流体。第4期成脉流体来源于同层地层水和深部幔源热液流体的混合流体。苏北盆地黄桥地区三叠系青龙组碳酸盐岩储层中4期脉体的形成时间与不同期次构造活动具有对应关系, 表明构造活动对流体活动的控制作用。储层中3期深部热液流体的注入是因为构造活动导致深大断裂沟通深部流体而注入到储层中的结果, 多期的深部热液流体活动可能指示了黄桥地区三叠系青龙组储层具有多期油气成藏的特征。
Abstract:Objective Calcite veins are the products of tectonic diagenesis. Information about fracture opening and fluid activity was recorded by calcite veins.
Methods Multiple approaches, consisting of thin section observation, cathodoluminescence, U-Pb isotope dating, and REE, C, O and Sr isotope analyses of calcite veins from the Triassic Qinglong carbonate reservoirs in the Huangqiao area, Subei Basin, are used to analyse the origin of vein-forming fluid.
Results Four stages of calcite veins were identified in the Qinglong Formation and successively formed at (115.30±0.42), (97.03±0.43), (85.29±0.25), (45.5±19.0) Ma. In the first stage, the calcite veins were derived from deep hydrothermal fluids.And in the second stage, the calcite veins were derived from mixed fluids of atmospheric fresh water and seawater. Formation water and deep shell-source hydrothermal fluid mixed in the vein-forming fluid of the third-stage calcite veins. In the fourth stage of calcite veins formation, deep mantle-source hydrothermal fluid mixed with the formation water, resulting in the precipitation of calcite veins. The formation timing of the four stages of calcite veins corresponds to multistage tectonic movements during different periods, indicating that fluid evolution in the Triassic Qinglong carbonate reservoirs was controlled by multiple stages of tectonic movements.
Conclusion Importantly, three stages of deep hydrothermal fluid injectionin the reservoir were the result of deep fault opening caused by tectonic movements, which possibly indicate multistage hydrocarbon accumulation in the Triassic Qinglong Formation in the Huangqiao area.
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Key words:
- calcite vein /
- carbonate reservoir /
- U-Pb isotope age /
- fluid source /
- fluid activity /
- Huangqiao gas field /
- Subei Basin
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图 3 苏北盆地黄桥地区三叠系青龙组方解石脉体岩相学和阴极发光特征
a~c.S174井,1 610.5 m,青龙组,裂缝充填C1方解石,C1方解石阴极发光呈亮红色;d~f.X2井1 738.36 m,青龙组,缝洞充填C2和裂缝充填C3方解石,C2方解石阴极发光呈暗红色,C3方解石阴极发光呈橘黄色;g, h.N13井1 438.56 m,青龙组,孔洞中充填C4方解石,阴极发光呈暗红色
Figure 3. Petrography and cathodeluminescence characteristics of calcite veins from the Triassic Qinglong Formation in the Huangqiao area, Subei Basin
图 8 苏北盆地黄桥地区埋藏史(改自文献[51])
Figure 8. Burial history of the Huangqiao area, Subei Basin
表 1 苏北盆地黄桥地区三叠系青龙组方解石脉体与围岩特征元素参数
Table 1. Characteristic elemental parameters of calcite veins and surrounding rocks from the Triassic Qinglong Formation in the Huangqiao area, Subei Basin
样品 w(Fe)/10-6 w(Mn)/10-6 w(Sr)/10-6 Fe/Mn Mn/Sr Y/Ho La/Ho C1方解石脉体 5 468.55 2 211.82 2 485.52 2.47 0.89 30.27 6.45 C1方解石脉体 5 664.54 2 159.44 2 665.74 2.62 0.81 32.90 6.96 C1方解石脉体 6 112.30 2 198.66 3 097.30 2.78 0.71 35.37 9.34 C1方解石脉体 6 078.90 2 185.26 3 189.04 2.78 0.69 33.75 9.11 C1方解石脉体 3 792.93 1 652.97 8 14.50 2.29 2.03 32.23 3.84 C1方解石脉体 5 509.96 2 076.61 2 546.05 2.65 0.82 38.33 11.35 C2方解石脉体 134.08 219.18 1 852.69 0.61 0.12 59.82 1.08 C2方解石脉体 127.66 219.35 1 426.23 0.58 0.15 47.44 0.41 C2方解石脉体 115.36 211.10 1 797.10 0.55 0.12 48.00 0.35 C3方解石脉体 171.00 998.41 452.22 0.17 2.21 34.82 0.04 C3方解石脉体 165.88 1 268.72 506.04 0.13 2.51 35.77 0.05 C3方解石脉体 181.73 1 512.56 23 254.05 0.12 0.07 41.56 0.12 C4方解石脉体 4 829.25 247.76 661.94 19.49 0.37 30.53 6.95 C4方解石脉体 4 702.50 250.32 340.08 18.79 0.74 29.07 6.66 C4方解石脉体 4 476.20 253.72 476.45 17.64 0.53 30.15 6.88 围岩 589.09 57.21 637.30 10.30 0.09 34.72 4.81 围岩 1 062.09 42.90 551.68 24.76 0.08 30.41 13.94 围岩 2 883.60 132.09 897.39 21.83 0.15 32.26 33.20 围岩 2 173.29 103.35 923.87 21.03 0.11 26.74 23.98 -
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