A porous sand layer or sand body filled with oil.
充填了油的多孔砂层或砂体。
A porous sand layer or sand body charged with natural gas.
充满天然气的多孔隙砂层或砂体。
Reservoir calibration method is especially important for accurate identification of thin sand layer.
要准确识别薄砂层，层位标定方法就尤为重要。
The bottom layer is a mixture of sand and clay.
最下面的一层是沙和泥的混合物。
The bottom layer is a mixture of sand and clay.
最下面的一层是沙和泥的混合物。
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