FAVORABLE LITHOFACIES AND SWEET SPOT OPTIMIZATION OF THE Ek21 SHALE OIL IN CANGDONG SAG, BOHAI BAY BASIN
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摘要:
为了优选出目标层位页岩有利岩相与预测页岩油分布甜点区, 采用主成分分析法(PCA), 对页岩油资源量(滞留烃)、物性(孔隙度、渗透率)、工程性质(脆性指数、岩石力学参数)3个主地质成分进行分析. 结果表明, 纹层状长英质页岩相与纹层状混合质页岩相滞留烃含量高、孔渗性好且脆性指数偏大; 王官屯、七里店以南、沈家铺东南地区为页岩油分布甜点区, 具有较好油气显示.
Abstract:To optimize the favorable lithofacies of shale and predict the sweet spots of shale oil distribution in the first sub-member of the second member of Kongdian Formation (Ek21), the principal component analysis (PCA) is used to analyze three main geological components of shale oil, including resources (retained hydrocarbon), physical properties (porosity and permeability) and engineering properties (brittleness index and rock mechanics parameter). The results show that the lamellar felsic shale facies and lamellar mixed shale facies have high retained hydrocarbon content, with good porosity and permeability, and high brittleness index. Areas such as Wangguantun, south of Qilidian and southeast of Shenjiapu are all sweet spots of shale oil distribution with good oil-gas show.
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Key words:
- principal component analysis /
- retained hydrocarbon /
- porosity /
- permeability /
- shale oil sweet spot /
- Bohai Bay Basin
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表 1 页岩样品三轴力学实验结果
Table 1. Triaxial mechanical test results of shale samples
样品编号 密度/（g/cm3） 围压/MPa 抗压强/MPa 泊松比 杨氏模量/GPa 工1-1 2.53 5 — — — 工1-2 2.54 15 92.49 0.252 19.53 工1-3 2.54 25 180.52 0.268 31.55 工1-4 2.53 35 220.05 0.222 30.07 工2-1 2.37 5 132.75 0.2 23.98 工2-2 2.39 15 230.11 0.24 22.48 工2-3 2.44 25 262.21 0.214 27.42 工2-4 2.47 35 288.63 0.218 29.21 
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