PNST测井响应数值模拟平台的设计与实现  

Design and Implementation of Numerical Simulation Platform for PNST Logging Responses

作　　者：郑华 孙亮 邓茜珊 张静[1] 周玉婷 徐翠 ZHENG Hua;SUN Liang;DENG Xishan;ZHANG Jing;ZHOU Yuting;XU Cui(Logging and Testing Services Company,PetroChina Daqing Oilfield CO.LTD.,Daqing,Heilongjiang 163453,China;Exploration and Development Research Institute,PetroChina Daqing Oilfield CO.LTD.,Daqing,Heilongjiang 163712,China)

机构地区：[1]中国石油大庆油田有限责任公司测试技术服务分公司,黑龙江大庆163453 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《测井技术》2022年第5期523-529,共7页Well Logging Technology

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2017ZX05013-005);中国石油天然气集团有限公司重大科技项目“测井核心装备与软件平台研制”(2021DJ3905);中国石油天然气集团有限公司勘探与生产分公司科技项目“钻完井关键技术研究与现场试验”(kt2021-13-01)。

摘　　要：为了方便、快速、准确地表征脉冲中子全谱测井仪(PNST)的测井响应,开发了一套数值模拟平台。该平台基于通用蒙特卡罗模拟软件包,按照实际PNST建模,以实体实验数据对基准模拟模型做校验,模拟与实测能谱或时间谱的决定系数R~2均大于0.995,模拟准确度较高。平台实现了选择PNST型号、按井眼条件与地层参数变化范围批量处理生成数值模拟输入文件、按标准流程模拟脉冲中子测井能谱和时间谱、批量提取测井参数等功能。通过接续计算、多种蒙特卡罗方差减小技术和多核服务器并行处理的组合运用,大幅提高了数值模拟计算时效;收集到现场完井和地层条件后,1天内可完成油气水三相饱和度解释图版的制作。应用该平台,获得了元素标准谱库,制作了复杂岩性条件下用碳氧比、氯能谱、俘获截面等测井资料解释岩性、孔隙度、含油气饱和度的图版,为PNST测井技术在大庆、冀东、长庆等油田的良好应用提供了有力支撑。A set of numerical simulation software platform for the pulsed neutron spectral tool(PNST)has been developed in order to characterize the tool’s logging responses conveniently,quickly and accurately.Due to the fact that it is based on the general Monte Carlo simulation software package and modeled according to the actual PNST,the simulation accuracy of this platform is quite high.The basic simulation model is benchmarked with physical experimental data,and determination coefficients between the simulated and measured energy spectrum or time spectrum are both greater than 0.995.It realizes the functions of selecting PNST type,generating simulation input files by batch processing according to the variation range of wellbore conditions and formation parameters,simulating pulsed neutron logging energy spectrum and time spectrum according to standard procedures,and extracting logging parameters by batch processing and so on.Simulation efficiency is greatly improved by combining sequential computations,various Monte Carlo variance reduction techniques,and parallel processing on multi-core servers.After collecting the on-site completion and formation conditions,it can be processed to form the oil-gas-water three-phase saturation interpretation chart within one day.By using this platform,the standard elemental spectrum library is created.The charts are made to interpret lithology,porosity,and oil and gas saturation from logging data such as C/O ratio,Cl/H ratio,and capture cross-section under complex lithology.It provide strong support for the good applications of PNST logging technology in Daqing,Jidong,Changqing and other oilfields.

关 键 词：脉冲中子全谱测井仪 岩性 孔隙度 含油气饱和度 蒙特卡罗模拟 软件平台 设计 

分 类 号：P631.84[天文地球—地质矿产勘探]