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洞穴型碳酸盐岩地层具有显著的非均质性和测井预测难度大的特点,如何利用双侧向测井对识洞穴进行准确识别与定量评价,是当前的一个研究难点与热点。利用数值模拟方法计算电测井响应,可为洞穴识别与评价提供理论依据。本文根据双侧向测井原理,采用有限元素法,研究了球状洞穴模型的测井响应特征,并考察了不同尺寸的洞穴对电测井响应的影响;然后,系统研究了不同充填程度的洞穴模型的测井响应,得出了电阻率与充填程度之间的关系;最后,研究了洞穴中充填泥质、灰质、砾岩和砂泥岩薄互层等多种充填物的测井响应特征。研究结果对碳酸盐岩洞穴型储层的识别与评价具有较高的应用价值和研究意义。
Cave-type carbonate strata have significant heterogeneity and difficulty in logging prediction. How to recognize and quantify the cave with double lateral logging is a difficult and hot topic at present. Using numerical simulation method to calculate electrical logging response can provide theoretical basis for cave identification and evaluation. According to the principle of double lateral logging, the finite element method is used to study the logging response characteristics of the spherical caves model. The effects of caves with different sizes on the electrical logging response are investigated. Then, the caves with different filling degrees The relationship between the resistivity and filling degree is obtained. Finally, the logging response characteristics of various fillings, such as muddy, gray, conglomerate and sand-shale thin interbedded layers, are studied. The research results have high application value and research significance for the identification and evaluation of carbonate cavern reservoirs.