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储层岩石T₂-G实验采集参数自动匹配技术研究
吴飞^1,2,范宜仁^1,2,邓少贵^1,2,邢东辉^1,2,刘玺^1,2,巫振观¹
(1.中国石油大学地球科学与技术学院,山东青岛 266580;2.中国石油大学CNPC测井重点实验室, 山东青岛 266580)

摘要:

针对改良式CPMG(Car-Purcel-Meiboom-Gill)序列测量储层岩石内部磁场梯度分布时难以确定第一个窗口持续时间t₀及回波个数NE₁的问题,在总结T₂-G实验采集参数人工调节规律的基础上提出t₀、NE₁的一项自动匹配技术:构造待测岩石的T₂-G近似分布模型,基于该模型变化t₀、NE₁进行T₂-G回波串正演数值模拟,结合T₂-G最优化采集参数的约束条件确定t₀、NE₁。该技术在保证实验精度的前提下显著提高了实验效率,不同区块8块砂岩的T₂-G实验结果也验证了该技术的可行性和实用性。

关键词: 改良式CPMG序列内部磁场梯度采集参数自动匹配数值模拟

DOI：10.3969/j.issn.1673-5005.2014.04.007

分类号::P 631.813

基金项目:“十二五”国家油气重大专项(2011ZX05020008-002);国家自然科学基金项目(41174009)

Automatic matching technology for determining acquisition parameters of formation rock T₂-G experiment

WU Fei^1,2, FAN Yiren^1,2, DENG Shaogui^1,2, XING Donghui^1,2, LIU Xi^1,2, WU Zhenguan¹

(1.School of Geosciences in China University of Petroleum,Qingdao 266580,China; ;2.CNPC Key Laboratory for Well Logging in China University of Petroleum,Qingdao 266580,China)

Abstract:

In order to solve the difficulties in determining the acquisition parameters such as t0 and NE1 when using the modified CPMG(Car-Purcel-Meiboom-Gill) sequence to measure the internal magnetic field gradient of formation rock, an automatic matching technology for determining t₀ and NE₁ was proposed after summarizing the empirical rules applied in the field:the T₂-G approximated distribution model of tested rocks is first constructed; then with the approximated model the response of T₂-G experiment is calculated by tuning t0 and NE1 using numerical simulation methods, and lastly the suitable t₀ and NE₁ are determined by using constraints from the optimal model. The accuracy and efficiency of the method is further verified in the T₂-G experiment using eight sandstone samples from different regions.

Key words: modified CPMG sequence internal magnetic field gradient acquisition parameters automatic matching numerical simulation