Sequence Stratigraphy Variation and Its Implication in Shale Oil Exploration: A Case Study of the Eocene Dongying Depression, Eastern China

Figure 3

Characteristics of main lithofacies in the Es4u member in the Dongying Depression. (a) Massive bedding developed in the siltstone, 3439 m. (b) Gray clayey shale and cross-bedding developed in the siltstone, 3444 m. (c) Calcareous shale: light laminae comprise calcite; dark laminae are composed of clay minerals, 3397.5 m. (d) Dark gray calcareous shale developing dark and light laminae, 3397.5 m. (e) Gray mixed shale developing laminae, 3331.5 m. (f) Mixed shale composed of calcite, quartz, clay minerals, and pyrite, 3331.5 m.

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