论文部分内容阅读
岩溶成因碳酸盐岩油气储层的展布预测,是全球石油地质家一直在探索的热点问题之一。下古生界岩溶型碳酸盐岩储层是盆地内极有潜力赋存大油气田的储集体。本文以岩溶类型研究为基础、以海平面波动史构建为切入点、以塔里木盆地下古生界为例,开展了海平面波动中的岩溶响应研究。分析表明,塔里木盆地早古生代海平面下降期均发育了准同生岩溶。准同生岩溶为埋藏岩溶和风华壳岩溶提供了良好的溶蚀介质输导孔隙。地球物理资料显示,塔北下奥陶统的两期风化壳岩溶叠加于先期的准同生岩溶作用之上。海平面波动史的重建及岩溶格架分析表明,塔里木地区早古生代海平面波动与岩溶发育呈现良好的耦合关系。海平面变化是控制塔里木盆地下古生界岩溶储层发育的一个重要的因素。
The prediction of the evolution of carbonate reservoirs in karst is one of the hot issues that petroleum geologists worldwide have been exploring. The Lower Paleozoic karstic carbonate reservoir is a reservoir within the basin that has the potential to host large oil and gas fields. Based on the study of karst types and taking the history of sea level fluctuation as the starting point, taking the Paleozoic in the Tarim Basin as an example, the paper studies the karst response in the sea level fluctuation. The analysis shows that the Paleozoic karstification developed in the early Paleozoic sea level decline period in the Tarim Basin. Quasi-syngenetic karst provides a good solution medium for the migration of karst and quiescent karst karst. Geophysical data show that two weathering crustal karsts over the Lower Ordovician in Tabarco superimposed on the pre-syngenetic karstification. The reconstruction of sea-level fluctuation history and karst grid analysis show that the Early Paleozoic sea level fluctuation in Tarim Basin has a good coupling relationship with karst development. Sea level change is an important factor in controlling the development of karst reservoirs in the Lower Paleozoic in the Tarim Basin.