“三低”高含水气藏录井解释评价方法

Mud logging interpretation and evaluation method for the "3 Lows" high water-bearing gas reservoir

鄂尔多斯盆地苏里格西区是典型的低渗、低压、低丰度的高含水岩性气藏,对于这样复杂的储集层,仅用气测录井资料难以解释评价。为解决这一难题,针对"三低"高含水气藏的特点,以苏里格西区盒8段为例,从储集层物性、含气性、含水性的录井表征参数入手,优选出评价储集层的几个关键参数:含水性为灌满系数和氯离子含量;物性为物性因子;含气性为全烃曲线积分面积。根据该区盒8段79口井80个储集层数据分别建立了含水性、含气性解释图板,形成了一套快捷、准确的解释评价方法,简化了解释评价过程。应用上述方法对苏里格西区20层盒8段储集层进行验证,符合率达到80%,表明这一方法能够对低渗、低压、低丰度高含水岩性气藏进行准确评价。

Sulige west area in Erdos Basin is the typically high water-bearing lithological gas reservoir with low permeability,low pressure and low abundance.In view of such a complex reservoir,it is difficult to interpret with only gas logging data.In order to solve this difficult problem,according to the features of '3 Lows' high water bearing gas reservoir,taking He 8 interval in Sulige west area as the example and setting out from the mud logging phenomena of reservoir property,gas bearing property and water bearing property,the authors optimized several critical parameters for evaluating the reservoir which are the full filling coefficient and chlorinity to reflect water-bearing property,the physical property factor to reflect physical property,the total hydrocarbon curve integral area to reflect gas bearing property.In accordance with the 80 reservoir data obtained from 79 wells in He 8 interval of the area,the interpretation charts for water bearing property and gas bearing property were respectively established,thus a set of fast,accurate interpretation and evaluation methods were formed,simplifying the interpretation and evaluation process.20 reservoirs in He 8 interval in Sulige west area were verified by applying the above mentioned methods,the coincidence rate reached to 80%.It showed that the methods could be used to carry out accurate evaluation for the high water-bearing lithological gas reservoir with low permeability,low pressure and low abundance.