流体包裹体精细分析在塔中志留系油气成藏研究中的应用

Detailed analysis of fluid inclusions and its application in accumulation history research on Silurian reservoirs in Tazhong area,Tarim Basin

利用均一温度、荧光光谱、红外光谱、三维荧光光谱(TSF)、色谱-质谱(GC-MS)等流体包裹体分析技术对塔中志留系油气藏的复杂油气成藏过程进行研究。结果表明:塔中志留系储层中发育3期不同类型的烃类包裹体;确定塔中志留系油气藏的3期成藏过程,即在泥盆纪沉积末期中下寒武统来源的原油第I期成藏,泥盆纪末构造抬升剥蚀遭受破坏形成残余沥青;二叠纪沉积末期中上奥陶统来源的原油第Ⅱ期成藏;喜山期中下寒武统来源的深部调整油气第Ⅲ期成藏;现今油气主要为第Ⅱ期和第Ⅲ期成藏的油气混合。

Based on the analysis of fluid inclusions including homogenization temperature, fluorescence spectroscopy, FT-IR spectroscopy, total scanning fluorescence spectroscopy （TSF） and GC-MS, the complicated accumulation process of Tazhong Silurian reservoirs was studied. The results show that three different types of hydrocarbon inclusions and developed in Tazhong Silurian reservoirs. The reservoirs have experienced three periods of hydrocarbon accumulation process. In the first period, the crude oil sourced from middle-lower Cambrian source rocks is accumulated in late Devonian and then damaged by tectonic uplift and erosion at the end of Devonian, forming the residual black bitumen. In the second period, the oil sourced from the middle-upper Ordovician source rocks is accumulated in late Permain. In the third period, the light oil ＆ gas early accumula- ted in deeper reservoirs and mainly sourced from the middle-lower Cambrian source rocks is adjusted and migrated up through faults and then accumulated again in Silurian reservoirs in the Himalayan period. The current oil ＆ gas accumulation in Silurian reservoirs is mainly a mixture of oil ＆ gas accumulated in the second and third period.