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Sweet spot evaluation and exploration practice of lacustrine shale oil of the second member of Kongdian Formation in Cangdong sag, Bohai Bay Basin
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HAN Wenzhong,ZHAO Xianzheng,JIN Fengming,PU Xiugang,CHEN Shiyue,MU Liangang,ZHANG Wei,SHI Zhannan,WANG Hu
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Table 1 Composition, structure of the shale in Ek21.
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Quasi-
sequence | Shale
lithofacies | Dominant
lithology | Rhythmic structure | Logging curve characteristics | Lamina density/
(Layer•m-1) | NMR effective porosity*/
% | Content of clay minerals*/% | TOC*/
% | S1*/
(mg•g-1) | Rt/
(Ω•m) | Amplitude of gas logging response | | PS4 | Layered limy-dolomitic shale (D) | Limy dolomitic shale, hybrid
shale | Layered | Serrated box shape | 15 | 6.1 | 14 | 1.6 | 3.3 | 9-15 | Generally low | | PS3 | Laminar felsic shale (C) | Felsic shale | Laminar | Serrated box shape | 54 | 3.8 | 25 | 4.5 | 7.6 | 30-100 | Generally high | | PS2 | Laminar
hybrid
shale (B) | Limy dolomitic shale, hybrid
shale, felsic shale accounting for one third respectively | Laminar | High
frequency sawtooth | 42 | 5.5 | 16 | 4.0 | 4.5 | 30-110 | | PS1 | Thin-layer
limy dolomitic shale (A) | Limy dolomitic shale, hybrid
shale | Thin layered | Medium frequency
sawtooth | 25 | 6.6 | 18 | 3.4 | 3.7 | 70-150 | High value in local parts |
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