CN110702484B - 含水溶盐储层岩心原地孔隙度计算与含水饱和度建立方法 - Google Patents
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Abstract
本发明含水溶盐储层岩心原地孔隙度计算与含水饱和度建立方法,涉及石油与天然气致密储层岩心分析领域,含水溶盐储层原地岩样取至地面过程中,从地层温度压力条件到地面温度压力条件,岩样内部会发生盐结晶,导致岩样孔隙度发生变化,本方法考虑了常规孔隙度测试方法和建立含水饱和度方法的不足,同时通过质量守恒原理确定了地层水矿化度,从而计算原地孔隙度和建立含水饱和度,保证了实验的可靠性,是一种属于石油天然气勘探开发过程中岩心分析方面的实验方法。
Description
技术领域
本发明涉及石油与天然气致密储层岩心分析领域含水溶盐储层岩心原地孔隙度计算与含水饱和度建立方法,属于石油天然气勘探开发过程中岩心分析方面的实验方法。
背景技术
中国非常规油气资源量丰富,潜力巨大,前景广阔。致密砂岩油气、页岩油气、煤层气,碳酸盐岩油气产量不断增长,非常规油气资源的开发已经成为我国能源格局中不可或缺的一部分。非常规油气储层形成于海相或咸化湖等沉积环境时,储层内部形成大量水溶盐,导致地层水矿化度较高,含水溶盐储层岩心从原地温度压力条件取至地面温度压力条件过程中,盐结晶引起岩心孔隙结构变化,进而导致孔隙度发生变化。然而,获得含水溶盐储层的岩心原地孔隙度对于含水饱和度建立具有重要作用,且岩心含水饱和度的建立是开展致密储层岩电实验的基础。岩电实验作为岩石物理研究的一个重要手段,主要通过测量岩石的孔隙度、电阻率和饱和度等参数来求取阿尔奇公式中的4个关键参数,进而计算地层含油气饱和度。从储层保护的角度考虑,使用地层水矿化度建立岩心含水饱和度后开展含水溶盐储层岩心的岩电实验,符合储层条件,相比蒸馏水,它不会改变含水溶盐储层岩心的孔隙结构,对孔隙度影响较小。获得储层的原地岩心孔隙度和建立所需的含水饱和度对致密油气藏的开发具有重要意义。
常规孔隙度测试方法反映的是岩样的直观孔隙度,而含水溶盐储层原地岩样取至地面过程中,岩样内部会发生盐结晶,引起岩样孔隙度发生变化,导致常规测试方法无法反映原地孔隙度,同时也影响含水饱和度的建立。
发明内容
本发明的目的在于通过含水溶盐储层岩心原地孔隙度计算与含水饱和度建立方法,为后续致密储层岩电实验的开展奠定基础。
本发明通过以下技术方案实现:
步骤2、分析储层水溶盐矿物类型与比例,配制实验用复合水溶盐,并将复合水溶盐完全溶解,开展复合水溶盐结晶实验,分析地层水从储层条件下到地面条件下的结晶程度,记盐结晶比例系数η,盐结晶比例系数η为结晶盐析出量与初始溶液中水溶盐质量比值;
步骤4、确定要建立的含水饱和度,通过岩心原地孔隙度确定孔隙体积,确定建立地层水矿化度条件下的含水饱和度所用地层水的体积与质量,根据地层水矿化度配制的模拟地层水将纤维浸湿,岩心在纤维上滚动,岩心两端不能接触水;
步骤5、重复步骤4,直至岩样吸水质量达到建立含水饱和度所需地层水质量即可,然后将岩样进行密封保存,使水在岩心中渗吸分散;
步骤6、检查岩心质量,确保建立了所需的岩心含水饱和度。
与现有技术相比,本发明具有如下有益效果:
(1)确定含水溶盐储层原地孔隙度计算的准确性。非常规油气储层形成于海相或咸化湖等沉积环境时,储层内部形成大量水溶盐,导致地层水矿化度较高,含水溶盐储层岩心从原地温度压力条件取至地面温度压力条件过程中,盐结晶引起岩心孔隙结构变化,进而导致孔隙度发生变化,使得孔隙度测试不准。同时,获取原地岩心孔隙度有助于岩心建立含水饱和度时确定地层水矿化度条件下的含水饱和度所用地层水的体积。
(2)提高岩电实验评价结果的客观性。岩电实验作为岩石物理研究的一个重要手段,主要通过测量岩石的孔隙度、电阻率和饱和度等参数来求取阿尔奇公式中的4个关键参数,进而准确地计算地层含油气饱和度。从储层保护的角度考虑,使用地层水矿化度建立岩心含水饱和度后开展含水溶盐储层岩心的岩电实验,符合储层的真实条件,它不会改变含水溶盐储层岩心的孔隙结构,对孔隙度影响较小。
(3)避免了洗盐对孔隙度测试造成的不便和人为测试孔隙度的误差。本发明通过产出水矿化度和盐结晶比例系数获得含水溶盐储层地层水矿化度,然后通过地层水矿化度和盐结晶比例系数计算含水溶盐储层的原地孔隙度,无需经过洗盐后开展孔隙度测试实验。
具体实施方式
为了对本发明的技术特征、目的和有益效果更加清楚的解释,结合具体参数和实施例进一步详细说明本发明的发明内容、特点,具体步骤如下:
步骤2、采用XRD分析储层水溶盐矿物类型与比例,配制实验用复合水溶盐,并将复合水溶盐完全溶解,开展复合水溶盐结晶实验,分析从储层条件下的地层水到地面温度压力条件下的产出水结晶程度,记盐结晶比例系数η,盐结晶比例系数η为结晶盐析出量与初始溶液中水溶盐质量比值;
步骤4、确定要建立的含水饱和度,通过岩心原地孔隙度确定孔隙体积,确定建立地层水矿化度条件下的含水饱和度所用地层水的体积与质量,根据地层水矿化度配制的模拟地层水将纤维浸湿,岩心在纤维上滚动,岩心两端不能接触水;
步骤5、重复步骤4,直至岩样吸水质量达到建立含水饱和度所需地层水质量即可,然后将岩样放入密封袋中密封保存,使水在岩心中渗吸分散;
步骤6、检查岩心质量,确保建立了正确的含水饱和度。
根据本发明,通过结晶实验确定地层水矿化度,基于地层水矿化度计算岩心原地孔隙度和建立岩心含水饱和度,保证了其客观准确性。此外,解决了含水溶盐储层常规孔隙度测试不准和含水饱和度建立的不足。
以上的具体实施方式已经结合具体参数和实施例对本发明的效果进行了详细描述,但是本发明并不局限于上述的具体实施方式,只要在不超出本发明的主旨范围内,可对实验条件及对象进行灵活的变更,这些均属于本发明的保护范围之内。
Claims (1)
1.含水溶盐储层岩心原地孔隙度计算与含水饱和度建立方法步骤如下:
步骤2、分析储层水溶盐矿物类型与比例,配制实验用复合水溶盐,并将复合水溶盐完全溶解,开展复合水溶盐结晶实验,分析地层水从储层条件下到地面条件下的结晶程度,记盐结晶比例系数η,盐结晶比例系数η为结晶盐析出量与初始溶液中水溶盐质量比值;
步骤4、确定要建立的含水饱和度,通过岩心原地孔隙度确定孔隙体积,确定建立地层水矿化度条件下的含水饱和度所用地层水的体积与质量,根据地层水矿化度配制的模拟地层水将纤维浸湿,岩心在纤维上滚动,岩心两端不能接触水;
步骤5、重复步骤4,直至岩样吸水质量达到建立含水饱和度所需地层水质量即可,然后将岩样进行密封保存,使水在岩心中渗吸分散;
步骤6、检查岩心质量,确保建立了所需的岩心含水饱和度。
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