求翻译：钻井显示，浅层发育大套砂岩，储层物性好，但缺乏厚层泥岩封盖，由薄层泥岩分隔为多套储盖组合。M组下部有大套泥岩发育，是该区好的烃源岩。是什么意思？

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The well drilling demonstrated that, the shallow layer grows the big wrap sandstone, the reservoir nature is good, but lacks the argillite to seal the lid, covers the combination by the thin layer mudstone separation for multi-wrap Chu.Lower part M group has the big wrap mudstone growth, is this are

Drilling shows that development of shallow sandstone and good reservoir properties, but the lack of argillite cover, separated by thin layers of mudstone reservoir-Cap combination. M group development of lower mudstone are good source rocks in the area.

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