页岩含气量主控因素及其定量模型
发布时间：2018-08-26 16:36
【摘要】：我国页岩气地质储量丰富,大致与美国相当,加强页岩气勘探开发既是满足我国油气需要的迫切要求,又是国家能源发展战略的规划。然而我国页岩气研究刚刚起步,页岩气相关理论研究亟待突破和完善,含气性作为页岩气地质理论的主要参数之一,其对深化页岩气成藏机理的研究有着很重要的促进作用,对提高评价页岩气资源量的精度和确定有利优选区有着重要的指导意义。本文以塔里木中生界泥页岩为研究对象。根据实验结果,分析研究区地质特征,分别建立吸附含气量与有机碳含量、石英、粘土矿物、RO、孔隙度、岩石比表面积等因素之间的关系,优选出影响塔里木盆地中生界泥页岩含气量的主控因素—有机碳含量和比表面积,其中有机碳含量是最主要的控制因素,因此建立页岩吸附气含量与有机碳含量单因素控制模型,其相关系数为0.742。在单因素模型基础上,采用多因素拟合方法,建立泥页岩吸附含气量多因素综合预测模型,(相关系数为0.912,因此多因素预测模型优于单因素预测模型)。同时对两个模型的可靠性进行了检验,并得出吸附气含量介于0.581~2.720 m3/t。由于游离气赋存于孔洞中,其主要受到总孔体积、比表面积、压力和温度因素影响,因此建立游离气含量与这四种影响因素的模型。通过模型,计算得出塔里木盆地中生界泥页岩游离气含量介于0.079~1.226 m3/t。总含气量即游离气与吸附气含气量之和,介于0.660~3.946 m3/t,含气量较好。此外,本文还建立了赋存于孔隙中的吸附气与游离气含量的比重与孔隙半径之间关系的理想模型。模型显示,理想条件下,塔里木盆地吸附气含量远远小于游离气含量。因而对比实际地层的吸附气含量(介于20.5%~79.5%),预测吸附气主要赋存在干酪根中,并对此观点进行了简单论证。
[Abstract]:China is rich in shale gas geological reserves, which is roughly equivalent to that of the United States. Strengthening shale gas exploration and development is not only an urgent requirement to meet the oil and gas needs of our country, but also a national energy development strategy plan. However, the study of shale gas in China has just started, and the research of shale gas related theory needs to be breakthrough and consummation. As one of the main parameters of shale gas geology theory, gas bearing property plays an important role in deepening the study of shale gas reservoir formation mechanism. It has important guiding significance for improving the accuracy of shale gas resource evaluation and determining favorable optimal separation area. This paper takes the Mesozoic shale of Tarim as the research object. According to the experimental results, the relationship between adsorption gas content and organic carbon content, quartz, clay mineral ROA, porosity, specific surface area of rock, etc., was established according to the geological characteristics of the study area. The organic carbon content and specific surface area are the main controlling factors that affect the gas content of Mesozoic shale in Tarim Basin, in which organic carbon content is the main controlling factor. Therefore, a single factor control model of shale adsorption gas content and organic carbon content was established, and the correlation coefficient was 0.742. On the basis of single-factor model, the multifactor comprehensive prediction model of shale adsorption gas content is established by using multi-factor fitting method. (correlation coefficient is 0.912, so the multi-factor prediction model is superior to the single-factor prediction model). At the same time, the reliability of the two models was tested, and the adsorption gas content was found to be between 0.581and 2.720m3 / t. Because the free gas exists in the pore, it is mainly affected by the total pore volume, specific surface area, pressure and temperature, so the free gas content and these four factors are modeled. Based on the model, the free gas content of Mesozoic shale in Tarim Basin is calculated to be between 0.079 ~ 1.226 m ~ (3 / t). The total gas content, that is, the sum of free gas and adsorption gas, is between 0.660 and 3.946 m3 / t, and the gas content is better. In addition, an ideal model for the relationship between the specific gravity of adsorption gas and free gas content and the pore radius is established. The model shows that the content of adsorbed gas in Tarim Basin is much smaller than that of free gas under ideal conditions. Therefore, for the adsorption gas content (between 20.5% and 79.5%), it is predicted that the adsorbed gas mainly occurs in kerogen, and this viewpoint is proved simply.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
本文编号：2205506
[Abstract]:China is rich in shale gas geological reserves, which is roughly equivalent to that of the United States. Strengthening shale gas exploration and development is not only an urgent requirement to meet the oil and gas needs of our country, but also a national energy development strategy plan. However, the study of shale gas in China has just started, and the research of shale gas related theory needs to be breakthrough and consummation. As one of the main parameters of shale gas geology theory, gas bearing property plays an important role in deepening the study of shale gas reservoir formation mechanism. It has important guiding significance for improving the accuracy of shale gas resource evaluation and determining favorable optimal separation area. This paper takes the Mesozoic shale of Tarim as the research object. According to the experimental results, the relationship between adsorption gas content and organic carbon content, quartz, clay mineral ROA, porosity, specific surface area of rock, etc., was established according to the geological characteristics of the study area. The organic carbon content and specific surface area are the main controlling factors that affect the gas content of Mesozoic shale in Tarim Basin, in which organic carbon content is the main controlling factor. Therefore, a single factor control model of shale adsorption gas content and organic carbon content was established, and the correlation coefficient was 0.742. On the basis of single-factor model, the multifactor comprehensive prediction model of shale adsorption gas content is established by using multi-factor fitting method. (correlation coefficient is 0.912, so the multi-factor prediction model is superior to the single-factor prediction model). At the same time, the reliability of the two models was tested, and the adsorption gas content was found to be between 0.581and 2.720m3 / t. Because the free gas exists in the pore, it is mainly affected by the total pore volume, specific surface area, pressure and temperature, so the free gas content and these four factors are modeled. Based on the model, the free gas content of Mesozoic shale in Tarim Basin is calculated to be between 0.079 ~ 1.226 m ~ (3 / t). The total gas content, that is, the sum of free gas and adsorption gas, is between 0.660 and 3.946 m3 / t, and the gas content is better. In addition, an ideal model for the relationship between the specific gravity of adsorption gas and free gas content and the pore radius is established. The model shows that the content of adsorbed gas in Tarim Basin is much smaller than that of free gas under ideal conditions. Therefore, for the adsorption gas content (between 20.5% and 79.5%), it is predicted that the adsorbed gas mainly occurs in kerogen, and this viewpoint is proved simply.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
【参考文献】
相关期刊论文 前1条
1 郝孝荣;;页岩气层测井响应特征及其含气量评价[J];科技资讯;2012年28期
，本文编号：2205506
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