The quality of a caprock is closely related to its thickness. Statistical data show that there is an obvious positive correlation between caprock thickness and hydrocarbon column height. This report established that the starting pressure gradient is the key factor in the relationship between caprock thickness and hydrocarbon column height by discussing the concepts and principles of breakthrough pressure, capillary pressure, and starting pressure. Analysis of the physical–chemical properties of the surfaces of mineral particles revealed that the structure of the diffused electric double layer stably develops in the pore throat at the micro- to nanoscale. This is a microcosm of the starting pressure generated in the argillaceous caprock. Based on force analysis, this report establishes that in the process by which fluid breaks through the argillaceous caprock, hydrocarbons slowly displace the formation water in the pore throats and mainly overcome the capillary pressure and adsorption resistance. The quantitative relationship between the caprock thickness and the maximum hydrocarbon column height is determined by considering the starting pressure gradient, and a method is proposed to calculate the maximum hydrocarbon column height of the caprock based on the formation overpressure. This method is successfully applied, and verification via gas testing is performed for offshore oil and gas fields by considering the X gas reservoir. The proposed method has good application prospects in the evaluation of argillaceous caprocks and reservoir risk prediction.

中文翻译：

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弧状盖层厚度与最大封闭烃柱高度之间的定量关系

盖层的质量与其厚度密切相关。统计数据表明，盖层厚度与烃柱高度之间存在明显的正相关关系。通过讨论突破压力，毛细压力和起始压力的概念和原理，该报告确定起始压力梯度是盖层厚度与烃柱高度之间关系的关键因素。对矿物颗粒表面的物理化学性质的分析表明，在电喉咙中，从微米级到纳米级，扩散的双电层的结构稳定发展。这是在泥质盖层中产生的起始压力的缩影。根据力分析，该报告确定，在流体突破泥质盖层的过程中，碳氢化合物缓慢地驱替了孔喉中的地层水，并主要克服了毛细管压力和吸附阻力。通过考虑起始压力梯度确定盖层厚度与最大烃柱高度之间的定量关系，并提出了一种基于地层超压计算盖层最大烃柱高度的方法。该方法已成功应用，并考虑了X气藏，对海上油气田进行了气体测试验证。该方法在泥质盖层评价和油藏风险预测中具有良好的应用前景。碳氢化合物会缓慢驱替孔喉中的地层水，主要克服毛细管压力和吸附阻力。通过考虑起始压力梯度确定盖层厚度与最大烃柱高度之间的定量关系，并提出了一种基于地层超压计算盖层最大烃柱高度的方法。该方法已成功应用，并考虑了X气藏，对海上油气田进行了气体测试验证。该方法在泥质盖层评价和油藏风险预测中具有良好的应用前景。碳氢化合物会缓慢驱替孔喉中的地层水，主要克服毛细管压力和吸附阻力。通过考虑起始压力梯度确定盖层厚度与最大烃柱高度之间的定量关系，并提出了一种基于地层超压计算盖层最大烃柱高度的方法。该方法已成功应用，并考虑了X气藏，对海上油气田进行了气体测试验证。该方法在泥质盖层评价和油藏风险预测中具有良好的应用前景。通过考虑起始压力梯度确定盖层厚度与最大烃柱高度之间的定量关系，并提出了一种基于地层超压计算盖层最大烃柱高度的方法。该方法已成功应用，并考虑了X气藏，对海上油气田进行了气体测试验证。该方法在泥质盖层评价和油藏风险预测中具有良好的应用前景。通过考虑起始压力梯度确定盖层厚度与最大烃柱高度之间的定量关系，并提出了一种基于地层超压计算盖层最大烃柱高度的方法。该方法已成功应用，并考虑了X气藏，对海上油气田进行了气体测试验证。该方法在泥质盖层评价和油藏风险预测中具有良好的应用前景。并通过考虑X气藏对海上油气田进行气体测试验证。该方法在泥质盖层评价和油藏风险预测中具有良好的应用前景。并通过考虑X气藏对海上油气田进行气体测试验证。该方法在泥质盖层评价和油藏风险预测中具有良好的应用前景。