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在四川盆地邛西地区上三叠统须家河组二段储层中,以胶结物形式存在的方解石相当普遍,其含量、分布及溶解程度直接影响储集层的储集性能。为此,根据实测岩心分析资料、薄片鉴定资料、测井资料等对该区须二段储层钙质夹层的特征和成因进行了分析,研究表明:钙质夹层在测井曲线上具有低伽马、低声波时差和刺刀状高电阻率值特征,钙质夹层主要集中在泥质层附近,在局部地区对天然气具有一定的渗流屏障作用;根据实测方解石胶结物碳、氧同位素分析表明,泥质岩或煤系地层排烃时生成的有机酸是酸性水的主要来源。
Among the reservoirs in the second member of Xujiahe Formation in the Upper Triassic in the Xi-Xian region of Sichuan Basin, calcite exists in the form of cements. Its content, distribution and dissolution directly affect the reservoir’s reservoir performance. Therefore, the characteristics and genesis of the calcareous interbeds in the second member of Xujiahe Formation in this area are analyzed based on the measured core analysis data, sheet identification data and well logging data. The results show that the calcareous intercalation has low gamma Horse, low sound wave time difference and bayonet-like high resistivity. The calcareous interbeds are mainly concentrated near the argillaceous layer, and have a certain barrier of natural gas flow in some areas. According to the measured carbon and oxygen isotope analysis of the calcite cements, Organic acids produced during the expulsion of muddy or coalbed formations are the main source of acidic water.