分类: 物理学 >> 核物理学 提交时间: 2024-01-03
摘要: 由于非常规储层的复杂岩性,现场解释人员通常需要使用测井模拟模型提供解释的基础。在使用放射源的各种检测工具中,探测器响应可以反映介质的各种信息。蒙特卡洛方法是获取复杂环境中核测量响应的主要方法之一。然而,这需要进行广泛的随机抽样的计算过程,消耗大量资源,并且不能提供实时响应结果。因此,提出了一种新颖的快速正演计算方法(FFCM)用于在各种复杂环境中使用体积探测约束快速计算探测器响应。首先,通过蒙特卡洛模拟收集探测体积、探测计数和通量灵敏度函数(FSF),建立了FFCM所需的数据库。然后,基于摄动理论和Rytov近似,使用通量灵敏度函数方法和一组简化模型推导出探测器响应模型。根据工具结构和有效探测体积内的地层和钻孔对模型进行优化,约束环境扰动。最后,将该方法应用于中子孔隙度测井工具进行验证。在各种复杂模拟环境中,蒙特卡洛和FFCM计算孔隙度结果之间的最大相对误差为6.80%,均方根误差为0.62 p.u.在现场井应用中,使用FFCM获得的地层孔隙度模型与解释人员获得的模型一致,证明了该方法的有效性和准确性。
分类: 核科学技术 >> 核探测技术与核电子学 提交时间: 2023-06-01
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2021-02-04
摘要: Quantum theory is currently the most important research field. Before processing the information of a quantum system, we must first understand how to measure the uncertainty of a quantum system. Von Neumann entropy is a very classic method to measure the uncertainty of quantum systems. However, due to the particularity of quantum systems, it is very difficult to measure the uncertainty of quantum systems, so that the measurement efficiency of the classical von Neumann entropy is not high in some cases. Based on the classic von Neumann entropy and belief entropy, this paper proposes a new entropy model to measure the uncertainty of quantum systems, which can use fully the eigenvalues and eigenvectors of the density matrix of quantum systems, and give the uncertainty of the quantum system. Some numerical examples are used to prove that the proposed entropy is more efficient and reliable in measuring quantum systems than the classical von Neumann entropy. The experimental results show that the proposed entropy can measure the uncertainty of quantum systems more efficiently and reliably than the classical von Neumann entropy.