摘要
通过对比分析塔里木盆地已知不同成因碳酸盐岩储层的自然伽马能谱测井铀相对值、钍铀比值及曲线形态,研究其可能的自然伽马能谱测井差别响应,以期对未知成因的碳酸盐岩储层做出合理判断。同生期岩溶铀相对值低且曲线平滑,钍铀比值为2～7,代表储层形成于氧化-还原的过渡环境;埋藏溶蚀作用形成的储层铀相对值基本大于0.5且曲线呈齿状,钍铀比值为0～2,铀的相对富集可能与埋藏溶蚀的流体性质有关,代表强还原环境;表生作用形成的储层铀相对值的峰值基本大于0.5且曲线呈指状,钍铀比值低,可能反映了储层的非均一性与表生岩溶的氧化环境;多成因叠加的碳酸盐岩储层铀相对值小于0.5且曲线呈指状,钍铀比值为0～2。
By comparatively analyzing the relative values of U, Th/U of the natural gamma- ray spectrometry logging and the curve shape of different geneses of carbonate karst reservoirs in Tarim Basin , different logging responses of the possible natural gamma- ray spectrometry logging were studied in order to make reasonable judgment to the unknown geneses of carbonate reservoirs. The relative value of U in contemporaneous karst was low and the Pu curve was smooth, the Th/U was between 2 to 7, which represented the transitional environment between oxidization and reduction in reservoir formation process. The relative value of U in buried denudation diagenetic reservoir was more than 0.5, the Pu curve was dentation and the Th/U was between 0 and 2. The concentration of uranium is probably related with the fluid property of buried denudation, which represents intensive reduction environment; The peak relative value of U in epigenetic reservoir is more than 0.5, and the Pu curve is dactylic.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2010年第1期264-267,3,共4页
Journal of Oil and Gas Technology
基金
国家科技重大专项项目(2008ZX05005-002-01)
