岩相精细划分方法在页岩油气研究中的应用
——以澳大利亚Eromanga盆地Toolebuc组页岩为例

Application of fine lithofacies division method in shale hydrocarbon:Taking Toolebuc Formation shale in Eromanga Basin of Australia as an example

谢英刚 葛岩 李乐忠 谷峰

中海油能源发展股份有限公司工程技术分公司，天津 300457 中海石油气电集团有限责任公司技术研发中心，北京 100027

Engineering Technology Company, Energy Resources Development Co. Ltd., CNOOC Ltd., Tianjin 300457, China Research and Development Center of Gas and Power Group, CNOOC Ltd., Beijing 100027, China

寻找“甜点”为页岩油气研究的突破口，而储集和保存条件是研究过程中的核心问题。文中研究运用TOC、扫描电镜、物性分析及X衍射等储层地化实验手段，对澳大利亚Eromanga盆地Toolebuc组页岩岩石学特征进行了全面分析，得出页岩中灰质、砂质及TOC与孔隙度成正比，黏土体积分数与含油饱和度呈负相关。应用岩心、测井资料对Toolebuc组页岩岩相进行精细划分，分析有利于页岩油气储集和保存的岩相组合。结果表明，Toolebuc组页岩存在页岩油气富集的基本条件，层内富含高丰度有机质的灰质页岩相、砂质页岩相或泥质灰岩相，是页岩油气富集的“甜点”区。

Searching sweet-point is the breakthrough point in shale hydrocarbon study and the storage and preservation condition are the key-point problems. The experiments and analysis methods such as TOC, scanning electron microscope, property analysis and X-ray diffraction are applied in this study. According to the lithology features analysis of Toolebuc Formation shale in Eromanga Basin, it is considered that calcite, sand contents and TOC have positive correlation with porosity, clay contents have negative correlation with oil saturation. Based on cores and logging dates, the lithofaices of Toolebuc Formation shale are fine divided and the lithofacies association favorable to the storage and preservation of Toolebuc Formation shale are analyzed. The result shows that the shales have dominating hydrocarbon condition, lime-shale lithofacies, sandy shale lithofacies and argillaceous lithofaices containing high abundance organic matter, which are the sweet-point areas for shale hydrocarbon accumulation.

10.6056/dkyqt201404003