| 塔里木盆地顺南501井鹰山组白云岩储层特征与成因 |
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| 引用本文： | 尤东华,韩俊,胡文瑄,陈强路,曹自成,席斌斌,鲁子野.塔里木盆地顺南501井鹰山组白云岩储层特征与成因[J].沉积学报,2018,36(6):1206-1217. |
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| 作者姓名： | 尤东华 韩俊 胡文瑄 陈强路 曹自成 席斌斌 鲁子野 |
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| 作者单位： | 1.南京大学地球科学与工程学院, 南京 210023; |
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| 基金项目： | 国家自然科学基金项目（U1663209，41702134） |
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| 摘 要： | 塔里木盆地顺南地区多口钻井揭示在白云岩储层中天然气富集成藏，但白云岩储层的成因存在争议。顺南501井鹰山组取芯段发育白云岩储层，为研究该地区白云岩储层成因提供了条件。通过岩芯观察与描述、显微岩石学、成岩作用与序列研究、基于铸体薄片的孔隙图像分析、计算机断层扫描、电子探针背散射成像与微量元素Fe、Mn定量、流体包裹体等技术手段，研究了白云岩储层特征与成因。结果表明，白云岩储层类型为裂缝-孔隙型，主要储集空间为裂缝-扩溶缝、晶间孔-晶间溶孔，孔隙发育与裂缝具有明显相关关系。热液矿物萤石与方解石呈共生关系充填于裂缝与孔隙空间。裂缝与孔隙附近的白云石、白云石环边以及与萤石共生的方解石均具有较高的FeO、MnO含量。萤石发育成群无色透明盐水包裹体，均一温度为165℃~175℃、盐度为15.5~17.5 wt.% NaCl equiv.。热液流体活动对围岩的改造导致局部方解石、白云石富Fe2+、Mn2+，同时提供了萤石结晶所需要的F-。一方面热液流体改造白云岩形成储集空间，另一方面以萤石与方解石为代表的热液矿物则充填裂缝与孔隙。因此，构造-热液流体活动在一定程度上影响了白云岩储集空间的形成。
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| 关 键 词： | 萤石 白云岩 白云岩储层 鹰山组 塔里木盆地 |
| 收稿时间： | 2017-10-18 |
Characteristics and Genesis of Dolomite Reservoirs in the Yingshan Formation of Well SN501 in the Tarim Basin |
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| Institution: | 1.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;2.Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China;3.Northwest Oilfield branch of Exploration and Development Research Institute, SINOPEC, Urumqi 830011, China;4.Department of Petroleum Geology, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Several wells drilled in the Shunnan area of the Tarim Basin revealed the enrichment and accumulation of natural gas in the dolomite reservoirs, but the genesis of those reservoirs is still controversial. Dolomite reservoirs cored from the lower Yingshan Formation in Well SN501 open a window to understanding the genesis of dolomite reservoirs in this area. Detailed core investigation, micropetrography, diagenesis event sequence, pore image analysis of casting thin section, computed tomography, backscattered imaging, and trace element Fe/Mn quantification of electron probes and fluid inclusions were carried out to study the characteristics and genesis of the dolomite reservoirs. The dolomite reservoir is the fracture-pores type, and the main reservoir space consists of intercrystalline pores and solution pores together with fractures and expansion fractures. There is a positive correlation between the occurrence of pores and fractures. Fluorite and calcite, as symbiotic hydrothermal minerals, filled in fractures and pores. The dolomites, dolomite ring edge, and calcite coexisted with fluorite near fractures, and pores show high contents of FeO and MnO. Groups of colorless transparent fluid inclusions in fluorites have 165℃-175℃ of homogenization and 15.5-17.5 wt.%NaCl salinity equivalent. Hydrothermal fluid activities should result in the enrichment of Fe2+ and Mn2+ in calcites and dolomites within the surrounding rock, and at the same time, provide the F- needed for fluorite crystallization. On the one hand, hydrothermal fluid reconstructs the dolomite to form the reservoir. On the other hand, the hydrothermal minerals acting as cements, represented by the fluorites and calcites, filled in fractures and pores. Thus, the generation of dolomite reservoir spaces should be related to tectonic-hydrothermal fluid activity. This understanding of the dolomite reservoir in well SN501 is of great significance to the establishment of a dolomite reservoir formation model and further exploration in this area. |
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