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| 基金项目：“十三五”国家科技重大专项“海外重点盆地地球物理勘探关键技术攻关与应用”（2017ZX05032-003） |
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| 摘要： |
| 西非深水盐下储层是近年来油气勘探的热点，L气田位于南加蓬次盆深水区，储层呈低渗特征，盐胶结作用是储层物性变差的主要原因。由于盐岩密度较低（2.1 g/cm3），存在盐胶结现象，可造成密度曲线值降低，给孔隙度计算带来偏差。识别储层是否存在盐胶结是该类储层评价的关键，分析发现元素俘获测井可以有效指示盐胶结的存在；在无元素俘获测井时，利用常规测井与核磁测井建立盐胶结识别因子曲线也能定性识别盐胶结的存在。在盐胶结层段声波测井可较准确地计算孔隙度，为下一步测井解释评价奠定了基础。 |
| 关键词：盐胶结 测井响应特征 元素俘获测井 孔隙度计算 南加蓬次盆 |
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| Abstract: |
| Deep water sub-salt reservoirs in West Africa have been the focus of oil and gas exploration in recent years. Located in the deep water area of the southern sub-basin of Gabon, Gasfield L is characterized by low permeability, which is mainly caused by salt cementation. Low density (2.1 g/cm3) of salt rock can lead to salt cementation, which results in lowering density curve and brings out difficulties to porosity calculation. Therefore, the key to reservoir evaluation is to identify salt cementation. Element Capture Spectra (ECS) logging can effectively indicate the existence of salt cementation. Without ECS logging, salt cementation can be identified by conventional logging and nuclear magnetic logging with particular curves. Sonic logging can accurately calculate the porosity of salt cemented intervals, which can lay a foundation for further logging interpretation and evaluation. |
| Keywords:salt cemenation logging characteristic ECS logging porosity calculation South Gabon Sub-basin |
| 张磊.南加蓬次盆L气田盐胶结储层特征分析与识别[J].地质学刊,2021,45(1):37-41 |
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