塔河油田艾丁地区奥陶系油气藏特征与成藏期

The Reservoir Characteristics and Hydrocarbon Accumulation Stages of Ordovician in Aiding Area of Tahe Oilfield,Tarim Basin

塔河油田艾丁地区发育加里东运动中期和海西运动早期岩溶。其中加里东运动中期3次幕式抬升形成了多套岩溶洞穴系统。储集层岩溶缝洞发育,储集类型以裂缝-溶蚀孔洞型为主,平面上具有"南北分带"的发育特征,油气藏具有连片整体含油特征,为超稠、超重残余古油藏。宏观分析与微观特征研究表明,艾丁地区油气成藏较早,为加里东运动晚期—海西运动早期成藏,又以后期调整改造为主。

The karsts of the middle Caledonian and the early Hercynian are widespread in Aiding area of Tahe oilfield in Tarim basin. Of which multi-karst and cavity system were formed by three episodic rising movements of the middle Caledonian. So the reservoir of the Ordo- vician in this area is dominated by fracture-cavity reservoir rocks, and characterized by north-south zonation in plane and oil bearing on the whole, being remained ancient oil reservoirs with ultra-thick or ultra-heavy oil. The macroscopic analysis and microscopic characteristics show that the hydrocarbon accumulation in Aiding area was earlier, and after reservoir-forming in the late Caledonian to the early Hercyn- ian, it entered into the process dominated by late adjustment and reconstruction.