Theoretically, when gas exists in reservoir, longitudinal wave offset time will increase and transverse wave offset time will not change and density will decrease and neutron will decrease, too.

理论认为当储层中存在着天然气时，会导致纵波时差增大，横波时差不变，密度测井值减小，中子孔隙度减小。

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High valuations and the reluctance on the part of cash-rich corporations to dispose of assets have offset the wave of cheap money, leaving private-equity firms more willing to sell than to buy.

WSJ: Current Account: Cheap Junk Leads to Expensive Mistakes