CAJ | 학술논문

岩石动、静态弹性参数之间存在差异，开展储层条件下岩石动、静态弹性参数实验，确定动、静态弹性参数转换关系，对储层压裂改造有重要的实际意义。利用NER公司的AutoLab 1500对苏里格气田致密砂岩进行模拟储层条件(包括地层温度、压力)下的岩石力学性质测试。结果表明：(1)同一批岩样，相同测量条件下测量得到的动态杨氏模量大于静态杨氏模量，且动态杨氏模量与静态杨氏模量有较好的线性关系，动态泊松比大于静态泊松比，但无明显相关性。(2)同一块岩芯，纵、横波速度随围压增大而增大，随温度升高而减小；动、静态杨氏模量随压力的增大而增大，动态杨氏模量随温度增大而减小，静态杨氏模量随温度升高而增大；动态泊松比随围压增大而减小，随温度升高略微减小，静态泊松比随围压增大而增大，随温度升高减小明显。对产生这种现象的机制进行分析，并确定在不同温度、压力条件下动、静态弹性参数之间的转换关系，为苏里格地区致密砂岩储层地层条件下岩石力学性质的研究提供了基本参数，对制定油气层的压裂施工方案提供参考依据。
암석동、정태탄성삼수지간존재차이，개전저층조건하암석동、정태탄성삼수실험，학정동、정태탄성삼수전환관계，대저층압렬개조유중요적실제의의。이용NER공사적AutoLab 1500대소리격기전치밀사암진행모의저층조건(포괄지층온도、압력)하적암석역학성질측시。결과표명：(1)동일비암양，상동측량조건하측량득도적동태양씨모량대우정태양씨모량，차동태양씨모량여정태양씨모량유교호적선성관계，동태박송비대우정태박송비，단무명현상관성。(2)동일괴암심，종、횡파속도수위압증대이증대，수온도승고이감소；동、정태양씨모량수압력적증대이증대，동태양씨모량수온도증대이감소，정태양씨모량수온도승고이증대；동태박송비수위압증대이감소，수온도승고략미감소，정태박송비수위압증대이증대，수온도승고감소명현。대산생저충현상적궤제진행분석，병학정재불동온도、압력조건하동、정태탄성삼수지간적전환관계，위소리격지구치밀사암저층지층조건하암석역학성질적연구제공료기본삼수，대제정유기층적압렬시공방안제공삼고의거。
Differences existed in dynamic and static elastic parameters. In order to obtain the transformation functions between dynamic and static elastic parameters,experiments were done under reservoir conditions,which had important practical significance for fracturing in reservoirs. Rock mechanical properties of tight sandstones under reservoir conditions(including formation temperature and pressure) in Sulige gas field were obtained using the AutoLab 1500 machine made by the New England Research Company. The results demonstrated that dynamic Young′s modulus was greater than the static Young′s modulus,and there was a liner relationship between them in the same core samples under the same experimental conditions. The dynamic Poisson′s ratio was higher than the static Poisson′s ratio,but there was no obvious relationship between them. The compressional velocity and shear velocity would both increase when confining pressure increases or temperature decreases in one core sample. The dynamic Young′s modulus of one core sample would increase when confining pressure increases or temperature decreases. However,the static Young′s modulus of one core sample would increase when confining pressure increases or temperature increases. The dynamic Poisson′s ratio of one core sample would decrease but the static one would increase when confining pressure increases. The dynamic Poisson′s ratio of one core sample would decrease but the static one would decrease obviously when temperature increases. The mechanism for this phenomenon was analyzed,and the transformation functions between the dynamic and static elastic parameters under different temperature or pressure were obtained. Basic parameters were offered for rock mechanical property researches under reservoir conditions in tight sandstones in Sulige gas field,which provide foundation for the development of oil layer fracturing program.