塔里木盆地塔河油田奥陶系古风化壳储集体形成演化

The Formation and Evolution of Weathering Reservoir of Ordovician Paleocrust in Tahe Oilfield,Tarim Basin

塔河油田奥陶系古风化壳储集体是阿克库勒鼻状凸起长期抬升暴露并经过长达118 Ma风化剥蚀而成。塔河地区的抬升是与周边天山、塔里木地块的多期古构造运动密切相关,该区曾经历加里东中晚期、海西期运动等8次(幕)运动。地壳的不断抬升变化,使塔河地区经过多种溶蚀作用,包括地表径流溶蚀作用、渗流溶蚀作用、潜流溶蚀作用、海岸带的混合水溶蚀和局部深处热水的溶蚀作用,从而形成多期叠加的混沌网络溶洞系统。溶洞发育程度受控于基岩颗粒灰岩的溶蚀程度、古构造运动的抬升作用、各种方式的溶蚀作用以及受溶蚀时期长短等。

The weathering reservoir of Ordovician paleocrust in Tahe oilfield undergoes weathering and denudation as long as 118 Ma from Middle Caledonia to Hercynian period.Cores observations and well logs explanations show that cave development in vertical is closely related to multistage tectonic movements of Northern Tianshan.The chaotic network of cave system were formed from multiphase superpositions of various dissolution such as direct runoff,vadose dissolution,underflow,mixed-water dissolution of coastal zone during 8 times uplift movements in the Mid-Late Caledonia and Early Hercynian movements.