塔中奥陶系碳酸盐岩裂缝的多方法表征及分布规律

Multi-Approach Characterization and Distribution of Ordovician Carbonate Fractures in Tazhong Area,Tarim Basin

奥陶系碳酸盐岩是塔中的主力产层,裂缝是重要的油气储集空间和渗流通道。综合岩心、测井、露头和地震等资料,提出了塔中奥陶系碳酸盐岩裂缝研究的多方法表征适用方案。研究认为,塔中奥陶系碳酸盐岩裂缝的分布规律与岩性、区域应力变化、构造部位等因素密切相关,在塔中北斜坡上具有南北分带、东西分块、受断裂控制的分布规律。

The Ordovician carbonate rock is the main oil producing reservoir in Tazhong area,in which the fractures are important reservoir spaces and seepage channels for oil and gas.Synthesizing the information from cores,well logs,outcrops and seismic data,a suitable method for multi-approach characterization the Ordovician carbonate fractures in Tazhong area is proposed.The study suggests that the distribution of fractures in the Ordovician carbonate rocks is related with the lithology,regional stress field and structural position,and appears in SN zonation,EW blocks and fault control in north slope of Tazhong area,Tarim basin.