| 塔中Ⅰ号坡折带上奥陶统礁滩的白云石化及其储集意义 |
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| 引用本文： | 郑兴平,寿建峰,朱国华,沈安江.塔中Ⅰ号坡折带上奥陶统礁滩的白云石化及其储集意义[J].海相油气地质,2009,14(1). |
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| 作者姓名： | 郑兴平 寿建峰 朱国华 沈安江 |
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| 作者单位： | 中国石油杭州地质研究院 |
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| 摘 要： | 塔里木盆地塔中Ⅰ号坡折带上奥陶统良里塔格组礁滩灰岩发生了少量白云石化作用。白云石化主要发育在溶洞充填的钙质渗流粉砂,泥晶生物碎屑灰岩的泥晶基质,亮晶颗粒灰岩的钙藻屑、藻砂屑、藻泥屑等三种组构中。白云石化直接贡献了平均1%的孔隙度,同时产生的白云石晶间孔为进一步溶蚀提供了通道,对有效储层的形成起到了重要作用。高镁方解石生物是白云石化所需镁离子的重要来源。这套与生物白云石化相关的礁滩储层地质预测需要深入研究钙藻、海百合等生物的古生态、岩相环境及分布。
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| 关 键 词： | 塔里木盆地 塔中Ⅰ号坡折带 晚奥陶世 良里塔格组 礁滩相 白云石化作用 孔隙演化 |
Dolomitization of Upper Ordovician Reef-Shoal Reservoir of Tazhong-Ⅰ Slop-Break Zone and Dolomitization Contribution to Reservoir |
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| Zheng Xingping,Shou Jianfeng,Zhu Guohua,Shen Anjiang.Dolomitization of Upper Ordovician Reef-Shoal Reservoir of Tazhong-Ⅰ Slop-Break Zone and Dolomitization Contribution to Reservoir[J].Marine Origin Petroleum Geology,2009,14(1). |
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| Authors: | Zheng Xingping Shou Jianfeng Zhu Guohua Shen Anjiang |
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| Abstract: | A small amount of dolomitization is found in the Upper Ordovician Lianglitage Reef-Shoal complex reservoir of Tazhong-Ⅰ Slop-Break Zone in Tarim Basin. The dolomitization commonly are in three fabics: (a) the calcic vadose silt of cave filling, (b) mud matrix of bioclastic packstone, and (c) calcareous alga, eophyton sand and alga-mud sand of grainstone. The result of the dolomitization directly contributes an average 1 percent of the porosity to the reservoir, while the intercrystal pores provide for channels of further erosion, which plays an impor- tant role to the formation of an effective reservoir. Biological high-Mg calcite is the important source of magne- sium ions for dolomitization. In-depth study on the distribution of Crinoid and Calcareous Alga rock is required to predict this dolomitization-associated reef-shoal reservoir. |
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| Keywords: | Late Ordovician Lianglitage Formation Reef-Shoal complex Dolomitization Pore evolution Tazhong-Ⅰ Slop-Break Zone Tarim Basin |
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