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低阻碳酸盐岩储层如叙利亚生物灰岩储层基岩电阻率可低至1~5Ωm,低电阻率碳酸盐岩中裂缝定量评价困难,传统的高阻基岩中裂缝评价方法适用性有限.本文利用三维有限元法精确模拟不同裂缝参数下的双侧向测井响应特征,总结了裂缝型低阻碳酸盐岩储层双侧向测井响应的特有规律,提出适合于低阻碳酸盐岩的裂缝参数评价初始模型.然后用成像资料提供的裂缝参数对其进行刻度,建立成像资料控制的双侧向裂缝参数定量评价方法.在研究区裂缝参数评价中,双侧向计算的裂缝参数与成像解释裂缝参数吻合较好,证明该方法可以有效应用于以低阻碳酸盐岩为储层的油气藏裂缝参数评价,成为裂缝定量评价的重要手段.
Low resistivity carbonate reservoirs, such as Syrian bio-limestone bedrock resistivity as low as 1 ~ 5Ωm, quantitative evaluation of fractures in low resistivity carbonate rocks is difficult, the traditional method of evaluation of fractures in high resistivity bedrock applicable The finite element method is used to accurately simulate the characteristics of double lateral logging under different fracture parameters and the unique laws of double-sided logging response of fractured low-resistance carbonate reservoirs are summarized. The initial model of the fracture parameter of the carbonate-resistant carbonate rock was evaluated, and then the fracture parameters provided by the imaging data were used to calibrate the method to establish the quantitative evaluation method of the bilateral fracture parameters controlled by the imaging data. In the evaluation of fracture parameters in the study area, The calculated fracture parameters are in good agreement with the interpretation of the fracture parameters. It is proved that this method can be effectively used in the evaluation of fracture parameters of reservoirs with low-resistance carbonate reservoirs and become an important measure for quantitative evaluation of fractures.