大洼油田水淹层测井解释方法研究

发布时间：2018-06-17 04:26

本文选题：大洼油田 + 水淹层解释　；参考：《东北石油大学》2015年硕士论文

【摘要】：本文是以L油田四个区块之一的大洼油田中后期开发水淹层测井解释为重点进行研究工作的。大洼油田储层条件复杂,注水开发时期较早,地下水电阻率变化异常。在实行了注水开发方式进行开采以后,各储层的含水率迅速上升,导致注入水在地层的推进过程中水淹状况出现了很大的差异。测井曲线响应差异很大,常规测井方法很难进行高精度的测井解释。本篇论文以大洼地区地质特征为基础,以该区储层水淹前后特征改变为前提,开展了大洼地区水淹机理的研究,为后续的测井解释工作提供了可靠保障。经过大洼水淹机理研究以后,归纳出各个测井曲线的响应规律、变化梯度以及在水淹状况不同情况下地下储层的特征,将其汇入数据库,以此为基础,根据沉积砂体具体特征划分出基本解释单元。通过建立的空间状态模型,在划分出的基本解释单元内根据多个测井资料的变化趋势和卡尔曼增益值来确定该系统内各个油层之间水淹情况的改变方向从而成功实现了储层水淹状况的定性判别。在完成水淹级别的定性判断以后,利用多重迭代递归这一数学方法,在建立起来的改良后的双地层水电阻率模型内,计算储层各个重点参数,最终完成了大洼地区水淹层测井解释研究。本文利用该方法对区块内两口取心井的资料进行处理解释,并与岩心分析资料对比,符合率为73.18%。
[Abstract]:This paper focuses on the logging interpretation of water flooded zones in Dawa Oilfield, one of the four blocks in L Oilfield. The reservoir conditions in Dawa Oilfield are complex, the water injection development period is earlier, and the groundwater resistivity is abnormal. After the water injection development is carried out, the water cut of each reservoir increases rapidly, which leads to great differences in the waterflooding situation in the process of the injection water in the formation. The response of log curve is very different, so it is difficult for conventional logging method to interpret well with high precision. Based on the geological characteristics of Dawa area and the change of reservoir characteristics before and after flooding, this paper has carried out a study on the mechanism of flooding in Dawa area, which provides a reliable guarantee for the subsequent logging interpretation work. After studying the mechanism of flooding in Dawa, the response law of various logging curves, the changing gradient and the characteristics of underground reservoir under different conditions of water flooding are summarized. The basic interpretation unit is divided according to the specific characteristics of sedimentary sand body. By building a spatial state model, According to the variation trend of multiple logging data and the Kalman gain value, the direction of the change of the water flooding situation among the oil layers in the system is determined in the divided basic interpretation unit, and the qualitative judgement of the reservoir water flooding condition is successfully realized. After the qualitative judgment of water flooding level is completed, the mathematical method of multiple iterations recursion is used to calculate the key parameters of reservoir in the improved water resistivity model of double formation. Finally, the logging interpretation of flooded zones in Dawa area was completed. In this paper, the data of two coring wells in the block are processed and interpreted by this method, and compared with the core analysis data, the coincidence rate is 73.18.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6;P631.81

【参考文献】