鄂尔多斯盆地东部石千峰组天然气成藏机理初探

THE ELEMENTARY ANALYSIS OF RESERVOIR MECHANISM IN THE SHIQIANFENG FORMATION OF THE EASTERN ORDOS BASIN

地层剥蚀与油气运聚之间存在着必然的联系,地层剥蚀破坏了先期存在的油气运聚平衡,导致油气沿着剥蚀量最大、应力释放最大的方向运移。从地层剥蚀角度着手,结合盆地东部白垩纪以来地层剥蚀厚度恢复结果,认为剥蚀厚度较大区带是石千峰组成藏的有利部位。利用烃类流体包裹体均一温度并结合盆地东部的地热史,厘定出石千峰组气藏成藏时间为晚白垩世,这与盆地整体向西倾斜、地层大量剥蚀的时间基本上是一致的。

The connection between stratum denuclearize and gas movement-gathering are very close, the balance of the early gas reservoir are destroyed by stratum denuclearize, the gas move along the thickest of denuclearize and the largest of stress release. In the paper, according to the principle of stratum denuclearize and the outcome of the denuclearize thick, decide the conclusion that the favorable reservoir area of Shiqianfeng formation lie in the thickest area of denuclearize. The reservoir time are decided by inclusion body homogeneity temperature and terrestrial heat history, the time is the telophase of the Cretaceous period, the reservoir time and tectonic movement is accordant.