Abstract: M5 block is a typical tight carbonate reservoir with low porosity and permeability. The natural productivity of production wells in this kind of reservoir is low, and it is difficult to reach the limit of economic exploitation. In order to achieve a more ideal stimulation effect, the acid fracturing technology is often used as a stimulation measure for such reservoirs. The fracture conductivity after acid fracturing is an important basis to evaluate the effect of reservoir fracturing, and the fracture conductivity is affected by fracture surface morphology, effective stress and other factors. Therefore, here are the great significance to predict fracture conductivity and characterize the nonuniformity of fracture wall under the effective stress for productivity prediction. The core of this block is taken as the experimental research object, and the stress concentration theory in rock mechanics is introduced to establish the conductivity calculation model by quantitatively analyzing the variation law of opening in the process of wall contact. Finally, the model is verified. There are two main modules in this research: such as the digital characterization module of fracture surface and the conductivity calculation module. The obtained conclusions has a certain reference value for improving the effect of reservoir reconstruction in the later stage of production wells in this block.

Key words: Acid corrosion fracture, Fracture surface morphology, Conductivity

摘要： M5区块为典型的低孔、低渗致密碳酸盐岩储层。这类储层的生产井天然产能低，很难达到经济开采极限。为了达到更为理想的增产改造效果，现场多用酸压技术作为此类油气藏实施增产的措施。酸压改造后的裂缝导流能力是评价储层压裂改造效果的重要依据，而裂缝导流能力受裂缝表面形态、有效应力等因素影响，因此预测裂缝导流能力和表征在有效应力作用下裂缝壁面非均匀程度对于产能预测具有重要意义。以该区块岩心为实验研究对象，采用“实验—理论—模拟”的研究方法，引入岩石力学中应力集中理论，利用定量分析壁面接触过程中开度变化规律建立导流能力计算模型，最后对模型进行验证。主要从裂缝表面数字化表征模块和导流能力计算模块开展研究。研究结果对提高该区块生产井后期储层改造效果具有一定的参考价值。

关键词: 酸蚀裂缝, 裂缝表面形态, 导流能力