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本文根据粘土矿物、硅酸盐矿物及镜质体反射率的实测资料,确定了古地温梯度。尔后结合上侏罗统沙河子组和营城组,在各地质时期的埋藏深度,估算其有机质在各地质时期的古地温。从而确定该二组地层中有机质的热变史及其烃类成熟阶段。最后,研究了本区两个凹陷上侏罗统有机质各成熟阶段与区域盖层青山口组成岩程度的匹配关系,指明了天然气成藏条件,认为杏山凹陷含气远景优于莺山凹陷。
In this paper, based on the measured data of clay minerals, silicate minerals and vitrinite reflectance, the paleogeothermal gradient was determined. Combined with the Upper Jurassic Shahezi Formation and Yingcheng Formation, the buried depth of each geological period was estimated, and the paleotemperature of the organic matter in each geologic period was estimated. So as to determine the thermal history of organic matter in the two formations and their hydrocarbon maturation stage. Finally, the matching relationship between the maturity stages of the upper Jurassic organic matter and the regional cap rocks in Qingshankou area of the two sags is studied. The gas accumulation conditions are pointed out. The gas potential of the Xingshan sag is better than that of the Yingshan sag.