Geological significance of late Mid-Permian stratigraphy in northern and eastern Sichuan Basin, SW China
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摘要: 四川盆地中二叠统茅口组具有良好的勘探前景,但目前对川北—川东地区茅口晚期地层划分及相关地质认识存在不足。基于120口井的测井资料分析,并结合3条野外剖面的实测情况,重新识别了川北—川东地区茅口组与吴家坪组界面,进一步明确了茅口晚期沉积格局。取得以下3点认识:(1)自然伽马能谱测井可以有效识别茅口组上部硅质沉积物和吴家坪组底部泥页岩,依据新的地层划分方案,茅口组LHST2段(茅二a亚段—茅三段)尖灭线向东大幅推移至开县附近。(2)构造沉降控制了茅口晚期地层向东减薄和沉积演化。(3)茅口晚期沉积相由碳酸盐岩均斜缓坡相逐渐变为远端变陡缓坡相,最终演化为弱镶边台地相;远端变陡缓坡相控制了茅口组白云岩和硅质沉积物形成,弱镶边台地相控制了茅口组川北台缘带形成。Abstract: The Mid-Permian Maokou Formation in the Sichuan Basin shows good petroleum prospectivity. However, knowledge of the stratigraphy in the northern and eastern Sichuan Basin during the late Maokou period are still unclear. The interface between the Maokou and Wujiaping formations was re-identified, and the sedimentary pattern in the study area during the late Maokou period was clarified based on the logging data from 120 wells combined with the measured data of three field profiles. The results suggest the following. (1) Natural gamma-ray spectral logging can effectively identify the siliceous sediments at the top of Maokou Formation and the mud shale at the bottom of Wujiaping Formation. According to a new stratigraphic division, the erosional edge on LHST2 section of Maokou Formation moved eastward to the Kaixian area. (2) Tectonic subsidence controlled the eastward thinning and the sedimentary evolution in the late Maokou period. (3) The sedimentary evolution in the late Maokou period was from the homoclinal carbonate ramp facies to the distal steepening ramp facies, and then to the weak rimmed platform facies. Distal steepening ramp facies controlled the formation of dolomite and siliceous sediments, while the weak rimmed platform facies controlled the formation of the platform margin.
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图 2 川北—川东地区构造分区及资料点分布
据文献[18]修改。
Figure 2. Structural zoning and data point distribution in northern and eastern Sichuan Basin
图 4 川北广元地区茅口组顶部与吴家坪组底部地层露头及镜下特征照片
a.西北乡剖面,茅口组—吴家坪组界面;b.XBX-P1样品点,单偏光,泥晶生屑灰岩;c.XBX-P3样品点,单偏光,硅质岩,可见放射虫形骸、海绵骨针和有孔虫;d.XBX-P5样品点,单偏光,硅质岩,可见放射虫和有孔虫;e.XBX-P7样品点,单偏光,泥页岩,纹层发育;f.XBX-P9样品点,单偏光,生屑灰岩,生物发育;g.XBX-P2样品点,黑色硅质岩;h.葛底坝剖面,茅口组—吴家坪组界面;i.屋基坪剖面,茅口组—吴家坪组界面
Figure 4. Outcrops and microscopic characteristics of strata at the top of Maokou Formation and the bottom of Wujiaping Formation, Guangyuan area, northern Sichuan Basin
图 9 四川盆地开江古隆起周缘茅口组—吴家坪组地层对比
剖面位置见图 8。
Figure 9. Stratigraphic correlation of Maokou-Wujiaping formations around Kaijiang Paleouplift, Sichuan Basin
图 10 川北—川东地区茅口组LHST2段层序地层对比
剖面位置见图 8。
Figure 10. Sequence stratigraphic correlation of Maokou Formation LHST2 in northern and eastern Sichuan Basin
表 1 川北—川东地区茅口组硅质岩与吴家坪组泥页岩自然伽马能谱测井数据
Table 1. Statistics of natural spectral gamma logging of Maokou Formation siliceous rocks and Wujiaping Formation mud shale in northern and eastern Sichuan Basin
井名 深度/m 地层 岩性 GR/API U/10-6 Th/10-6 井名 深度/m 地层 岩性 GR/API U/10-6 Th/10-6 NC1 4 978~5 006 吴家坪组 泥页岩 99.2 4.3 13.7 茅口组 硅质沉积物 YB3 7 128~7 142 123.0 4.7 19.9 YB3 7 178~7 211 117.1 13.4 1.8 TD23 4 733~4 740 114.7 3.7 13.1 TD23 4 740~4 748 192.0 15.5 1.7 TL2 5 500~5 516 108.1 4.9 11.8 TL2 5 579~5 585 102.9 10.0 2.2 JJ1 4 292~4 306 120.9 4.4 18.2 JJ1 4 369~4 372 118.0 13.9 3.1 L8 4 864~4 873 99.5 1.7 9.1 L8 4 957~4 963 84.3 10.6 1.9 PX1 3 756~3 769 92.2 2.9 13.7 PX1 3 769~3 791 157.0 14.5 5.7 HL5 4 878~4 891 104.5 2.8 9.8 HL5 4 891~4 899 129.1 14.1 3.1 MX3 4 779~4 785 100.2 3.2 14.2 MX3 4 785~4 788 115.1 9.6 0.9 TD26 4 314~4 332 120.5 2.6 12.4 TD26 4 385~4 399 96.8 10.4 3.0 CZ1 5 181~5 189 165.3 6.6 19.1 CZ1 5 189~5 192 198.7 20.1 4.9 LT2 6 016~6 021 164.0 7.2 13.7 LT2 6 021~6 037 142.9 13.6 4.8 平均值 117.7 4.1 14.1 平均值 132.2 13.2 3.0 表 2 高GR段Th/U比值统计
Table 2. Th/U ratios of high GR section
井名 深度/m 地层 岩性 Th/U 沉积环境 NC1 4 978~5 006 吴家坪组 泥页岩 2.0~6.8/3.8 还原—氧化过渡环境 YB3 7 128~7 142 吴家坪组 泥页岩 3.1~19.5/5.5 还原—氧化过渡环境 PX1 3 756~3 769 吴家坪组 泥页岩 2.0~16.7/5.7 还原—氧化过渡环境 TD23 4 733~4 740 吴家坪组 泥页岩 2.1~10.4/4.7 还原—氧化过渡环境 YB3 7 178~7 211 茅口组 硅质沉积物 0.02~0.3/0.1 还原环境 PX1 3 769~3 791 茅口组 硅质沉积物 0.03~1.5/0.4 还原环境 TD23 4 740~4 748 茅口组 硅质沉积物 0.04~0.7/0.1 还原环境 注:表中算式含义为:最小值~最大值/平均值。 -
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