Attenuations of different types of gas hydrate cementation in fluid-saturated porous solids are discussed. The factors affecting estimation of gas hydrate and free gas saturation are analyzed.
Shallow gas formations are of the characteristics of shallow burial depth, low compaction degree, unconsolidated cementation, easy sand producing etc.
浅气层具有埋藏浅、压实程度低、胶结疏松、生产时容易出砂的特点。
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Thispaper proposes the concept of background value and cut off value, a merthodfor indicating oil-gas zone by formation cementation exponent is detailed.