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据自生伊利石K-Ar同位素测年技术对塔中隆起志留系沥青砂岩油藏成藏年代的测定,并与孔雀河地区进行对比。塔中隆起及孔雀河地区志留系沥青砂岩的自生伊利石年龄为383.45~203.96 Ma,表明主要为晚加里东—早海西期和晚海西期成藏,位于盆地边部的乔1井、孔雀1井及龙口1井、英南2井相对较早(383.45~271.20 Ma),主要为晚加里东—早海西期成藏,位于盆地中心的塔中37井、塔中67井、塔中12井及塔中32井相对较晚(203.96~235.17 Ma),主要为晚海西期成藏,部分井如塔中23井、塔中30井相对较早(293.54和296.31 Ma),为早海西期成藏。自生伊利石年龄与沥青砂岩厚度具有较好的对应关系,说明古构造格局可能是主要的成藏控制因素之一,位于沉降中心及其周围的古油藏如乔1井、孔雀1井成藏较早。测年结果不仅与油气系统等常规油气成藏史研究成果基本一致,而且还进一步反映了油藏形成时间上的差异。
According to the dating of K-Ar isotope dating of authigenic illite, the age of the Silurian asphaltic sandstone reservoirs in the Tazhong uplift was measured and compared with that in the Kongquehe region. The palaeo-nephrite ages of the Tarim uplift and the Silurian asphaltic sandstones in the Kongquehe area range from 383.45 to 203.96 Ma, indicating that they mainly formed during the late Caledonian-Early Hercynian and Late Hercynian hydrocarbon accumulation. The Qiao-1 well on the margin of the basin , Well Peacock1 and Longkou1 and Well Yingnan2 are relatively early (383.45 ~ 271.20 Ma), mainly for the Late Caledonian-Early Hercynian period, and are located in Tazhong37 and Tazhong67 wells in the center of the basin, Tazhong 12 and Tazhong 32 wells are relatively late (203.96-235.17 Ma), mainly for the late Hercynian hydrocarbon accumulation. Some wells, such as Tazhong 23 and Tazhong 30, are relatively early (293.54 and 296.31 Ma) For the early Hercynian period of accumulation. The correlation between the age of authigenic illite and the thickness of asphaltic sandstones shows that the palaeo-tectonic setting may be one of the main controlling factors for gas accumulation. The paleo-reservoirs located in and around the center of the settlement such as Qiao-1 well and Peacock-1 well Earlier. The results of the dating are not only consistent with the research results of conventional hydrocarbon accumulation history such as oil and gas systems, but also further reflect the differences in reservoir formation time.