海上低渗砂砾岩气藏需要储层改造才能获得工业气流,杨氏模量、泊松比、水平主应力及脆性指数是模拟和优化砂砾岩储层高效改造的基础参数。针对海上砂砾岩储层岩性、物性参数横纵向变化大,岩石力学及地应力参数准确表征难度大的问题,以海上低渗砂砾岩气藏开发层位为研究对象,在岩心实验数据的基础上,进行岩石力学参数标定,得到岩石力学参数与声波、密度测井参数解释模型,实现动态及静态参数的互换,进而计算弹性力学参数。利用弹性波动理论结合常规测井资料计算岩石力学参数,在三维地质模型基础上,建立三维泊松比、弹性模量和地应力场等岩石力学参数模型,为海上低渗砂砾岩储层可压裂性评价和精细化裂缝形态模拟提供了必要的基础。

In order to obtain industrial gas flow, the low-permeability sandstone conglomerate gas reservoir requires reservoir reconstruction. Young's modulus, Poisson's ratio, horizontal principal stress and brittleness index are the basic parameters to simulate and optimize the efficient the reconstruction of sandstone conglomerate gas reservoir. In view of the significant horizontal and longitudinal variations in lithology and physical property parameters of offshore sandstone conglomerate reservoir, and the challenges in accurately characterizing rock mechanics and in-situ stress parameters, this paper focuses on the development horizon of offshore low-permeability sandstone conglomerate gas reservoir. Based on core experimental data, rock mechanics parameter calibration is performed, leading to the development of an interpretation model that correlates rock mechanics parameters with acoustic wave and density logging parameters. This model facilitates the interchange of dynamic and static parameters to calculate the elastic parameters. Utilizing elastic wave theory in conjunction with conventional logging data, rock mechanics parameters such as Poisson's ratio, elastic modulus and geostress field are established on a three-dimensional geological model. This provides a necessary basis for the evaluation of fracturing property and the simulation of fine fracture morphology in offshore lowpermeability sandstone conglomerate reservoirs.