Organic-rich Black Mudstone

Laminated facies control

The laminated facies combinations determine pore structure and shale oil occurrence, guiding reservoir selection.

JiKai, Dong · Dong, Chunmei · Lin, Chengyan · Zhao, Ziru · XinRu, Zheng · Liu, Lianqi · Cong, Nie · Bin, Liu

Acta Sedimentologica Sinica 2025

Advantages

Better pore structure

The organic-rich + aragonite lamina combination mudstone has higher porosity and better pore structure than other combinations, which is favorable for shale oil storage and flow.

Most mobile oil

In the organic-rich + aragonite combination, shale oil is present in a free state within interlayer spaces, and is the most mobile.

Distinguish reservoir quality

The different strata combinations influence porosity, pore structure and hydrocarbon storage capacity, providing a basis for reservoir evaluation.

Applications

• Shale oil and gas exploration：Identify high-porosity reservoirs by lamina combinations to guide exploration.
• Reservoir evaluation：Rapidly assess reservoir quality using lamina differences to select favorable zones.
• Mudstone reservoir：Clarify lamina control on mudstone storage properties for sweet spot prediction.