论文部分内容阅读
页岩气藏实现经济开采的关键条件之一是其具备充足的含气量。本文针对延长地区(以下简称YC)陆相非均质泥页岩,开展了泥页岩含气性实验测试及理论分析,确定了影响泥页岩含气量的关键因素,根据泥页岩体积模型及气体状态方程,确定了泥页岩游离气预测模型。由等温吸附实验确定的Langmuir体积常数和压力常数受到实验温度和压力条件及样品性质的限制,难以应用于实际泥页岩的吸附气量预测。为此,根据实验结果与热动力学原理,本文研究了地层温度、总有机碳含量(TOC)以及矿物组分对Langmuir体积常数和压力常数的作用,分别建立了Langmuir压力常数温度校正方程和Langmuir体积常数的温度、TOC及石英含量校正方程,将等温吸附试验建立的Langmuir方程的应用范围外推至任意储层温度、压力及岩性条件;建立了利用测井资料预测泥页岩含气量的计算方法,并将该方法应用于延长陆相泥页岩地层含气量预测分析中,预测结果经实验数据标定,表明本文所述方法具有较高精度。
One of the key conditions for economic exploitation of shale gas reservoirs is that they have sufficient gas content. In this paper, the shale gas-bearing experiment and theoretical analysis are carried out in the extended area (hereinafter referred to as YC) heterogeneous shale. The key factors affecting the shale gas content are determined. According to the shale volume model and gas State equation, determine the shale free gas prediction model. The Langmuir volume constants and pressure constants determined by isothermal adsorption experiments are limited by experimental temperature and pressure conditions and the nature of the sample, making it difficult to apply Langmuir volumetric sorption gas estimates to actual shale. Therefore, based on the experimental results and thermodynamic principles, the effects of formation temperature, total organic carbon (TOC) and mineral components on Langmuir volume constants and pressure constants were studied. Langmuir pressure-constant temperature-dependent equations and Langmuir Volume constants of temperature, TOC and quartz content correction equations, the isothermal adsorption experiment established Langmuir equation range of applications extrapolated to any reservoir temperature, pressure and lithological conditions; established using the logging data to predict the gas content of shale The method is applied to the prediction and analysis of gas content in the continental shale formation. The prediction results are calibrated by experimental data, which shows that the method described in this paper has higher accuracy.