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基于西沙群岛琛航岛上的西琛1井钻探资料,对西沙群岛生物礁储层特征和控制因素进行了研究,表明生物礁以植物藻礁为主,岩石成分类型为石灰岩和白云岩,结构类型有骨架岩、障积岩、粘结岩、颗粒岩和灰沙。储集空间类型包括原生的粒间孔、生物体腔孔和藻架孔,次生的溶孔和裂缝。生物礁储层储集性能具有分带性,其中有利储层分布带明显受冰川事件引起的海平面下降和白云岩化作用控制。
Based on the drilling data of Xichen-1 on Chenzhou Island in the Xisha Islands, the characteristics and controlling factors of the Xisha reef reservoir were studied. The results showed that the reef mainly consisted of phytoplankton, and the rock components were limestone and dolomite. The structure Types of skeleton rock, barrier rock, bond rock, granite and sand. The types of reservoir space include native intergranular pores, biological and hypocylic pores, secondary pores and fissures. Reef reservoir reservoir performance has zonality, in which the favorable reservoir distribution is obviously controlled by the sea level decline and dolomitization caused by glacier events.