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随钻根据录井的“钻时变快、氯离子明显增高、钻井液出口电导率明显增高、气测全烃及重烃含量增高、岩屑表面具盐溶蚀痕迹”等现象,可判断进入膏盐层。根据酚酞实验的变色差异可以区分膏岩与施工加入的石灰,进行氢氟酸实验可以区分膏盐层与粉砂岩,有效地提高了发现膏盐层顶界的及时准确率,提高了膏盐层段岩屑剖面符合率。
While drilling according to logging “drill faster, chloride ion was significantly increased, the drilling fluid outlet conductivity was significantly increased gas measurement of total hydrocarbons and heavy hydrocarbons increased, debris surface salt corrosion traces ” and other phenomena can be judged Into the gypsum salt layer. According to the difference of phenolphthalein experiment, it is possible to distinguish gypsum from lime added during construction, hydrofluoric acid experiment can distinguish gypsum salt from siltstone, effectively improve the timely accuracy of finding the top of gypsum salt layer, Section cuttings section coincidence rate.