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东濮凹陷是一个北北东向中生界地堑式沉积凹陷。凹陷北部、沙四上部和沙二上部沉积两套大面积分布的盐膏段地层。在构造的顶部(如××地区)沙二上部只有石膏沉积,没有盐岩沉积,即所谓无盐区。因此,××地区以沙二、三为主要目的层的井,泥浆电阻率R_m大于0.5欧姆米(18℃),称为淡水泥浆。在这种条件下,采用声波—感应组合测井系列(微电极、声速、井径、0.5米电位、4米梯度、感应、自然伽玛和自然电位)较为有效,能清楚地划分渗透层,判别岩性和区分油、气、水层。在有盐区,当钻开沙四或沙二上部盐层时,R_m<0.2欧姆米(18℃),称为盐水泥浆。在这种条件下,由于地层水矿化度(28～31万毫克/公升)比泥浆滤液矿化度(8万毫克/公升)高约4倍,声波—感应组合仍然是划分油、气、水层的主要测井方法。
Dongpu Depression is a north-northeast Mesozoic graben depression. Two sets of large-area distribution of salt-gypsum strata are deposited in the northern part of the sag, the upper part of Sha 4 and the upper part of Sha 2. In the top of the structure (such as × × area) only the upper part of sand two gypsum deposition, there is no salt rock deposition, the so-called salt-free zone. Therefore, in Well XX, wells with sand, sand and mud as the main targets have mud resistivity Rm greater than 0.5 ohm (18 ° C), which is called freshwater slurry. Under these conditions, it is more effective to use acoustic-induction logging suite (microelectrode, sound velocity, well diameter, 0.5 m potential, 4 m gradient, induction, natural gamma and natural potential) Judge lithology and distinguish oil, gas and water layers. In salty areas, R_m <0.2 ohm-meters (18 ° C), called brine mud, when drilling over the upper part of sand IV or sand II. Under these conditions, the sonic-induction combination is still a matter of dividing oil, gas, oil and gas into water because of formation water salinity (28-31,000 mg / L) which is about 4 times higher than the mud filtrate mineralization (80,000 mg / L) The main logging method of the water layer.