阵列声波数据处理与工程应用

发布时间：2018-11-26 07:13

【摘要】：对于致密砂岩储层,目前面临的一个重大问题是如何从薄而致密的储层中,实现油气的工业开采。基于地应力分析的储层可压裂性评价,成为非常规油气勘探开发必不可少的技术手段,而地应力分析的关键就是地层速度剖面的精确计算;阵列声波测井通过不同的声源与测量模式,以波场的形式记录不同性质地层的时差信息。基于阵列声波数据处理的储层可压裂性评价,为致密油气的工业生产提供了一种可靠途径。本文从时域和频域两个方面对阵列声波测井资料进行纵、横波时差提取,重点分析了常用的慢度-时间相关法、频谱加权相干法;利用提取到的纵波、横波时差信息,以鄂尔多斯盆地致密砂岩储层为研究对象,在准确的地应力建模的基础上,实现致密砂岩储层井壁稳定性分析、岩石脆性评价与可压裂性评价;最后,形成一套阵列声波测井工程应用综合解释技术流程,用于致密砂岩储层现场资料的处理与应用。具体内容如下:1、给出了时差提取的总体处理流程,包括原始数据预处理、滤波、时差提取,提高了时差提取的精确度。2、以岩石力学实验为基础,以地层测试和现场小型压裂测试资料为刻度标准,确定适用于研究区致密砂岩储层的地应力计算模型,实现致密砂岩储层地应力评价。3、在总结井壁失稳的原因和类型的基础上,选取有效的岩石破裂准则,分析井壁围岩应力分布规律,有效预测地层破裂压力和坍塌压力,给出安全泥浆密度窗。4、从脆性指数和断裂韧性2个方面对鄂尔多斯盆地致密气储层可压裂性测井评价方法进行研究。为克服单纯依赖脆性指数进行可压裂性评价时的不足,应用线弹性断裂理论构建脆性指数和断裂韧性相结合的可压裂性指数,进行有效的致密砂岩储层可压裂性评价。
[Abstract]:For tight sandstone reservoirs, one of the most important problems is how to realize the industrial exploitation of oil and gas from thin and dense reservoirs. Reservoir fracturability evaluation based on in-situ stress analysis has become an indispensable technical means for unconventional oil and gas exploration and development, and the key of in-situ stress analysis is the accurate calculation of formation velocity profile. Array acoustic logging records the time difference information of different strata in the form of wave field through different sound sources and measurement modes. The reservoir fracturability evaluation based on array acoustic data processing provides a reliable way for the industrial production of dense oil and gas. In this paper, the time-domain and frequency-domain data of array acoustic logging are extracted from longitudinal and S-wave moveout, and the slow-time correlation method and spectral weighted coherence method are analyzed. Based on the extracted longitudinal wave and shear wave time difference information, the tight sandstone reservoir in Ordos Basin is taken as the research object. On the basis of accurate in-situ stress modeling, the stability analysis of tight sandstone reservoir sidewall is realized. Evaluation of rock brittleness and fracturing ability; Finally, a set of comprehensive interpretation technology flow of array acoustic logging engineering is formed, which can be used to process and apply field data of tight sandstone reservoir. The main contents are as follows: 1. The overall processing flow of time difference extraction is given, including raw data preprocessing, filtering, time difference extraction, improving the accuracy of time difference extraction. 2. Based on rock mechanics experiments, Based on the data of formation test and field fracturing test, the calculation model of in-situ stress for tight sandstone reservoir in the study area is determined, and the in-situ stress evaluation of tight sandstone reservoir is realized. On the basis of summing up the causes and types of shaft wall instability, the effective rock fracture criterion is selected, the stress distribution law of surrounding rock is analyzed, the formation fracture pressure and collapse pressure are effectively predicted, and the safe mud density window is given. The fracturability logging evaluation method of tight gas reservoir in Ordos Basin was studied from two aspects of brittle index and fracture toughness. In order to overcome the shortcoming of simply relying on brittleness index to evaluate fracturability, a fracturability index combining brittleness index and fracture toughness is constructed by using linear elastic fracture theory to evaluate the fracturing ability of tight sandstone reservoir effectively.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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