双侧向测井响应特征分析及环境校正方法

 双侧向测井是确定地层含油性的关键测井资料之一，但由于受各种复杂因素的影响，其测井信息对油气层分辨能力受到限制，给油气层解释带来困难。本文依据电测井理论和快速正演数值计算方法，模拟不同储层条件下双侧向测井响应并分析其特征，从而揭示双侧向测井的影响因素；以此为基础，采用反演算法，对双侧向测井资料进行预处理，计算目的层位的原状地层电阻率、冲洗带电阻率及侵入半径，实现双侧向测井资料的环境校正。实际应用表明，该方法可有效消除双侧向测井的环境因素影响，识别油、气、水层符合率更高，可满足工程需要。

Analysis of Dual Laterolog Response Characteristics and Environmental Correction

Dual laterolog is a key to determine whether the stratum contains oil or not. However, due to impact of reservoir thickness, thin interbed oil reservoir, mud invasion and other factors, the discrimination capacity for oil and gas layers of the logging information is limited, bringing difficulties for oil and gas layer interpretation. Based on the electrical logging theory and fast forward numerical calculation method, this paper simulatesdual laterolog responseunder different reservoir conditions and analyzes its characteristics, revealing factors influencing the dual laterolog. On this basis, the inversion algorithm was used to carry out preprocessing of the dual laterolog data, calculatethe virgin zone resistivity, flushed zone resistivity and invasion radius, realizingthe environmental correction of dual lateral logging data. Applications show that this method can effectively eliminate environmental influenceon dual laterolog, and identify oil, gas and water layers with high accuracy, meeting engineering demand.