泥浆侵入储层电阻率测井动态反演多解性研究

钻井泥浆滤液对储层的侵入是一个与时间有关的动态过程，相应的测井结果与应是侵入时间的函数。与传统的基于静态的侵入阶跃模型所建立的侵入图版校正方法或计算机反演算法相比，我们的电阻率测井动态响应（ＤＲＲＬ）模型考虑了控制动态侵入过程的诸多因素，可以更加起初地反映动态侵入过程的特点。由于电测井的结果受含烃饱和度的变化和泥浆性质及其钻井工程条件等因素的影响，用ＤＲＲＬ模型对按泥浆浸泡时间记录的电阻率测井结果

Study of Multi-solution Characters for Inversion of Dynamic Resistivity Logging Responses to Oil/Gas Formation Invaded Mud-filtrate

Reservoir invasion by drilling fluid is related to time, hence the readings of resistivity logging are functions of invasion time. Comparing with traditional invasion charts and computer inversion algorithm, which are based on static step invasion model, the present Dynamic Responses of Resistivity Logging (DRRL) model takes into consideration some important factors that control the dynamic invasion process. Therefore, DRRL exhibits the characters of realistic invasion process and provides much information for analysts to evaluate a reservoir. Since DRRL is sensitive to the variation of saturation, mud property and drilling condition, it can be used to inverse and fit resistivity logging data that are recorded as varying parameters with invasion time, which is conductive to the determination of oil/gas and water zone and apparent resistivity correction for invasion. The multisolution problem can be solved by increasing logging data. Field application of dual induction and dual lateral logging proves that DRRL is a reasonable and effective method for reservoir evaluation,