下扬子区碎屑岩储层物性控制因素分析

摘要

Based on the testing data of outcrop and core samples,it was analyzed that the main control factors of physi-cal property of the clastic reservoir in Lower Yangtze Basin.It was clearly defined that the physical property of the clastic reservoir in the area was mainly affected by sedimentation, diagenesis, and tectogenesis.The sandstones in Longtan and Laokan Formations were mainly carbonate cementation and relatively developed secondary dissolution pores,and its reser-voir physical property was mainly affected by sedimentation and diagenesis;the sandstones in Wutong,Maoshan and Fentou Formations were mainly siliceous and iron ore cements and later lacked dissolution pores,and its reservoir physical property was mainly affected by tectogenesis.The study results showed that because later dissolution was very strong,there were rel-atively developed secondary dissolution pores in Longtan and Laokan Formations.As a result,Laokan and Longtan Forma-tion were the best clastic reservoir in Lower Yangtze Basin.%根据露头及岩心分析测试数据，分析了下扬子区碎屑岩储层物性主要控制因素。明确区内储层物性主要受沉积、成岩和构造作用影响。龙潭组和老坎组储层物性主要受沉积作用和成岩作用影响，砂岩以碳酸盐胶结为主，次生溶蚀孔隙相对发育；五通组、茅山组和坟头组砂岩主要为硅质胶结和铁矿石胶结，后期溶蚀孔不发育，储层物性主要受构造作用控制。研究认为，老坎组和龙潭组后期溶蚀作用强，次生溶蚀孔隙相对发育，为下扬子区物性条件最好的碎屑岩层系。