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首页> 外文期刊>Geoscience journal >Dolomites of the Yingshan Formation in the Tazhong Low Rise, Tarim Basin: dolomitisation and reformation model
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Dolomites of the Yingshan Formation in the Tazhong Low Rise, Tarim Basin: dolomitisation and reformation model

机译：Tarim盆地塔宏升高的青山形成白云岩：白细胞腺炎和改革模式

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摘要

The Tazhong Low Rise has abundant hydrocarbon resources in the Yingshan Formation of Lower Ordovician, where dolomite has been demonstrated to be a significant target for carbonate hydrocarbon exploration. Using optical observation and geochemical tests, three types of dolomite can be used as replacement and cement products. D1 dolomite is silt or fine crystalline, and has the fluid inclusions of low Th (71.4 A degrees C) and corresponding salinity (9.89 wt% NaCl). In addition, geochemical data indicate that D1 dolomite was formed with shallow burial fluids and was intensely affected by weathering karst in the middle Ordovician, which served as a mixing-zone for dolomitisation. D2 dolomite of medium-coarse grain has similar geochemical characteristics as D1 dolomite except that it has higher diagenetic temperature and negative delta O-18, suggesting that it generally developed in a deep burial environment. The cathodoluminescence showed two zonal structures in D1 dolomite, while at least three zonal structures in D2 dolomite were influenced by multiple burial diagenetic fluids. The D3 dolomite has a saddle structure with medium-coarse crystalline, high contents of Mn, Ba, Fe, and Sr, high Th (140 A degrees C), high salinity (20.36 wt% NaCl), and negative delta O-18 (-10.1 to-7.8aEuro degrees). Meanwhile, D3 dolomite is distributed near faults and fractures that are accompanied by hydrothermal minerals and is obviously influenced by hydrothermal fluids.
机译：塔宏崛起在奥腾汉莺山形成中具有丰富的碳氢化合物资源，其中白云石已被证明是碳酸碳酸烃勘探的重要目标。使用光学观察和地球化学测试，三种类型的白云石可用作更换和水泥产品。 D1白云石是淤泥或细晶体，并且具有低温（71.4℃）和相应的盐度（9.89wt％NaCl）的流体夹杂物。此外，地球化学数据表明D1白云石形成有浅埋液，受到中间奥陶器中的风化喀斯特的强烈影响，中间奥陶氏炎，其用作多眼炎的混合区。 D2中粗晶的Dolomite具有与D1白云岩相似的地球化学特性，不同之处在于它具有较高的成岩温度和阴性Delta O-18，表明它通常在深埋环境中开发。阴极辐发光显示D1白云石中的两个区域结构，而D2白云石中的至少三个区间结构受多个埋下的成岩液体的影响。 D3 Dolomite具有鞍座结构，具有中粗晶体，高含量的Mn，Ba，Fe和Sr，高TH（140℃），高盐度（20.36wt％NaCl）和负δO-18（ -10.1至7.8aeuro度）。同时，D3白云石分布在伴随水热矿物质附近的故障和骨折附近，并且明显受水热流体的影响。

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