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水平井地化录井技术在吉林探区的研究与应用 被引量:1
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作者 高庆奇 《录井工程》 2018年第1期63-67,72,共6页
针对水平井岩屑遭受钻井液污染、导致常规录井无法准确划分显示级别的问题,引进了水平井地化录井技术。在论证可行性方案的同时充分考虑到直井与水平井的差异,突破传统思维模式,并且围绕岩屑污染排除方法、样品分析方法及建立水平井评... 针对水平井岩屑遭受钻井液污染、导致常规录井无法准确划分显示级别的问题,引进了水平井地化录井技术。在论证可行性方案的同时充分考虑到直井与水平井的差异,突破传统思维模式,并且围绕岩屑污染排除方法、样品分析方法及建立水平井评价方法开展工作。通过现场实验摸索出了用40目粒度筛筛洗岩屑能有效排除钻井液的污染,对发现油气显示起到了重要作用;采用混合样分析的方法解决了挑选岩屑样品难题,同时避免了其中烃类的大量逸散;在与同区域多口直井资料对比的基础上,建立了吉林探区让字井地区泉四段水平井地化录井评价方法。该方法准确率较高,通过实际应用收到了较好效果,为今后地化录井技术的发展奠定了基础。 展开更多
关键词 水平井 地化录井 排除污染 混合样分析 解释评价
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Statistical Study on Cement-Soil Mixture Strength
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作者 于志强 曹永华 闫澍旺 《Transactions of Tianjin University》 EI CAS 2005年第3期223-229,共7页
This paper presents an investigation on strength of cement deep mixing (CDM) mixture. Four typical works of offshore or land-based projects are introduced. With samples from these projects and laboratory tests, stat... This paper presents an investigation on strength of cement deep mixing (CDM) mixture. Four typical works of offshore or land-based projects are introduced. With samples from these projects and laboratory tests, statistical analysis is made on the increment law of the strength of cement-soil mixture with different amount of cement, and strengths under different working conditions are compared. It is found that the amount of cement in the cement-soil mixture is closely related to the unconfined compressive strength of the mixture. At the age of 90 d,the unconfined compressive strength of the cement-soil mixture increased by 0.054 MPa—0.124 MPa with each cement increasing 10 kg/m3 in the cement-soil mixture, averagely increased by 0.085 MPa, while that at the age of 120 d increased by 1100 in comparison.The quality of the cement-soil mixture should be comprehensively evaluated in accordance with the trimmed average of strength, coefficient of variation and rock quality designation (RQD) indicators of sampling ratio. 展开更多
关键词 CDM mixture sampling unconfined compressive strength statistical analysis quality evaluation
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Bayesian Empirical Likelihood Estimation of Quantile Structural Equation Models 被引量:7
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作者 ZHANG Yanqing TANG Niansheng 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2017年第1期122-138,共17页
Structural equation model(SEM) is a multivariate analysis tool that has been widely applied to many fields such as biomedical and social sciences. In the traditional SEM, it is often assumed that random errors and exp... Structural equation model(SEM) is a multivariate analysis tool that has been widely applied to many fields such as biomedical and social sciences. In the traditional SEM, it is often assumed that random errors and explanatory latent variables follow the normal distribution, and the effect of explanatory latent variables on outcomes can be formulated by a mean regression-type structural equation. But this SEM may be inappropriate in some cases where random errors or latent variables are highly nonnormal. The authors develop a new SEM, called as quantile SEM(QSEM), by allowing for a quantile regression-type structural equation and without distribution assumption of random errors and latent variables. A Bayesian empirical likelihood(BEL) method is developed to simultaneously estimate parameters and latent variables based on the estimating equation method. A hybrid algorithm combining the Gibbs sampler and Metropolis-Hastings algorithm is presented to sample observations required for statistical inference. Latent variables are imputed by the estimated density function and the linear interpolation method. A simulation study and an example are presented to investigate the performance of the proposed methodologies. 展开更多
关键词 Bayesian empirical likelihood estimating equations latent variable models MCMC algo-rithm quantile regression structural equation models.
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