碳酸盐岩储层酸岩反应表面形态模拟与演化

With the developing of geological understanding and exploration technology for carbonate reservoirs, the stimulation technique of deep complex reservoirs has become key and breakthrough technology for efficient exploration and development. Studying the formation and evolution of the acid rock reaction surface to improve the effectiveness of stimulation and deepen acid fracturing technology basic theory. Combined with acid rock reaction simulation and 3D digital representation technology, establish a set of carbonate acid rock reaction surface morphology analysis system, then quantitative analysis acid rock reaction kinetics and the etched surface morphology characteristic parameters under the condition of multiple factors. Based on the acid etching experiments microscopic analysis methods to explore and explain the acid etching behavior on different minerals types of carbonate in order to obtain quantitative regularity between carbonate petrology characteristics and dissolution rate. Combined with chemical reaction kinetics, fractal geometry and probability statistics and other related theory, to analyze the law and control mechanism between the carbonate acid etched surface morphology and acid rock reaction. On the basis of macroscopic reaction regularity and microscopic acid etching mechanism, the mineral acid rock reaction mathematical model of on the carbonate surface is established to analysis features and the evolution regularity of acid etching fracture surface under the formation conditions. This research will provide theoretical support for selecting the stimulation well and reservoir layer and evaluating the stimulate effect. Furthermore, the research also plays an important theoretical supporting to innovate and develop in efficient development and stimulation technology for deep carbonate reservoirs.

随着碳酸盐岩储层地质认识深化和勘探技术进步，该类储层改造技术已成为深层复杂油气藏高效勘探开发的关键和待突破技术。研究酸岩反应表面的形成及演化规律对提高改造措施有效性和深化改造技术基础理论具有指导作用。结合酸岩反应模拟与三维数字化表征技术，建立一套碳酸盐岩酸岩反应表面形态分析系统，定量分析多因素条件下的酸岩反应动力学和酸蚀表面形态特征参数。应用酸蚀实验微观分析手段，探索并解释不同类型碳酸盐岩矿物的酸蚀行为，获取碳酸盐岩岩石学特征与溶蚀速率之间的定量规律。结合化学反应动力学、分形几何及概率统计学等相关理论，剖析碳酸盐岩酸蚀表面形态与酸岩反应间的相关规律及其控制机理，以宏观反应规律和微观酸蚀机理为基础，建立碳酸盐岩表面矿物酸岩反应数学模型，分析地层条件下酸蚀裂缝表面形成特征及演化规律，为改造技术的选井选层和效果评价提供理论支撑，对于深层碳酸盐岩油气藏的高效开发和增产技术的创新发展有重要理论支撑。

酸岩反应表面形态是碳酸盐岩储层酸化压裂工艺中酸蚀裂缝导流能力的形成原因，同时也是其主控因素。目前复杂深层碳酸盐岩油气藏酸化压裂增产技术的技术思路为提高酸蚀裂缝导流能力。深入研究碳酸盐岩酸岩反应表面形态形成机理及演化过程，可清楚掌握碳酸盐岩中酸液的溶蚀过程，控制酸蚀表面形态，精确设计在高闭合应力作用下稳定有效的酸蚀裂缝导流能力，对优化工艺设计和提高增产效果有重要意义。.项目总结了酸蚀表面形成及影响机理，对比分析常规酸岩反应实验在酸蚀表面形态研究中的适应性，结合不同粘度酸岩反应模拟实验和数字化分析法，建立了一套酸蚀表面形态实验分析方法。定量分析多因素条件下的酸岩反应动力学和酸蚀表面形态特征参数。应用酸蚀实验微观分析手段，探索并解释碳酸盐岩微观酸蚀机理。应用化学反应动力学、统计学、多元线性回归等相关方法，剖析碳酸盐岩酸蚀表面形态与酸岩反应间的相关规律及其控制机理。以宏观反应规律和微观酸蚀机理为基础，建立碳酸盐岩表面矿物酸岩反应数学模型，模拟分析地层条件下酸蚀裂缝表面形成特征及演化规律。.研究旨在建立适用于研究酸岩反应表面形态的实验方法，探索酸岩反应表面形态形成机理，建立酸岩反应与酸蚀表面形态的相关规律，完善碳酸盐岩酸岩反应基础理论。为酸化压裂改造技术的选井选层和效果评价提供技术支撑，对于深层碳酸盐岩油气藏的高效开发和增产技术的创新发展有重要理论指导作用。