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以南海神狐SH7井和阿拉斯加冻土区Mount Elbert井为例,基于常规油气储集层利用测井数据估算地层力学参数的方法,估算海洋区和冻土区水合物储集层力学参数,并与其他研究者的测试或计算结果进行对比。算例分析结果表明:根据常规油气储集层力学参数与声波波速间的关系式,利用测井结果可以估算海洋区水合物储集层的内聚力、内摩擦角、抗拉强度和抗剪强度,但海洋区水合物储集层泥质含量、冻土区水合物地层内摩擦角、海洋区和冻土区水合物地层杨氏模量及体积模量的估算结果误差较大;建立适用于水合物储集层的力学参数与声波波速或水合物饱和度间的关系式,并通过测井方法获取声波波速或水合物饱和度数据,可以更准确地估算原位水合物储集层力学参数。
Taking Shenhu SH7 well in South China Sea and Mount Elbert well in Alaska frozen region as an example, the mechanical parameters of hydrate reservoirs in marine and permafrost regions are estimated based on the method of estimating formation mechanical parameters by using well logging data in conventional oil and gas reservoirs. Compare with other researchers’ tests or calculations. The results of the example analysis show that the cohesion, internal friction angle, tensile strength and shear strength of hydrate reservoirs in the marine zone can be estimated according to the relationship between mechanical parameters and acoustic velocity of conventional oil and gas reservoirs. However, the estimation error of the clay content of the hydrate reservoir in the marine zone, the internal friction angle of the hydrate stratum in the permafrost zone, the Young’s modulus and the bulk modulus of the hydrate stratum in the marine zone and the permafrost zone is relatively large. The relationship between mechanics parameters of reservoir and sound wave velocity or hydrate saturation can be obtained by well logging method to get the acoustic velocity or hydrate saturation data, which can more accurately estimate the mechanical parameters of in-situ hydrate reservoir.