内蒙古突泉盆地ZK-WJT钻井下侏罗统红旗组生烃潜力
The evaluation of hydrocarbon production potential of well ZK-WJT in Lower Jurassic Hongqi Formation within Tuquan basin of Inner Mongolia
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摘要: 对突泉盆地西南缘ZK-WJT井红旗组烃源岩的发育特征和有机质丰度、类型及成熟度的研究表明，下侏罗统红旗组暗色泥岩发育，厚度达113.0m。有机碳的含量分布在0.56%~6.24%之间，平均值为1.90%。应用Pr/n-C17与Ph/n-C18的相关关系及C27、C28、C29甾烷（ααα-20R）三者的相对含量，判断其有机质类型为Ⅱ1型。镜质组反射率Ro主要分布于1.26%~1.73%之间，平均值为1.37%；岩石热解参数Tmax主要为489.0~517.0℃，平均值为507.6℃，红旗组烃源岩属于成熟—高成熟演化阶段。综合评价认为，突泉盆地下侏罗统红旗组具备较好的生油气潜力。Abstract: Based on the data of cross sections and organic geochemical measurements, the authors analyzed the distribution characteristics, organic matter abundance, organic matter type and organic matter maturity index of hydrocarbon source rock of Hongqi Formation from well ZK-WJT in Tuquan basin. The result shows that the thickness of dark mudstone is 113.0m. The TOC content ranges from 0.56 to 6.24 weight percent with an average value of about 1.90 weight percent. According to the relationships between the ratios of Pr/n-C17 and the ratios of Ph/n-C18 as well as steranes C27-C28-C29 triangular diagram, the organic matter is of Ⅱ1 type. The characteristics of vitrinite reflectance range from 1.26 to 1.73 percent with an average value of about 1.37 percent and Tmax ranges from 489℃ to 517℃ with an average value of about 507.6℃. These data show that the source rocks have turned into mature to high mature stage. It is concluded that the hydrocarbon source rocks of Hongqi Formation in Tuquan basin have good hydrocarbon generation potential.
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