塔北跃满区块一间房组碳酸盐岩断控型储层特征及其分布规律

Characteristics and distribution of fault-controlled carbonate reservoirs in Yijianfang Formation of Yueman area, northern Tarim Basin

【研究目的】跃满区块位于塔里木盆地哈拉哈塘油田塔里木河南岸地区,其奥陶系一间房组碳酸盐岩储层发育。勘探开发成果显示,该区高产井主要沿区内4条走滑断裂分布,并且沿断裂带表现出油气产量差异,具有较强的非均质性,储层受断裂控制明显,因此明确该类断控型储层特征及分布规律对油气勘探和开发具有重要意义。【研究方法】论文综合利用钻测井数据与岩心分析,结合三维地震资料,分析储层岩石学特征、储层类型及其发育规律,探讨优质储层与区内走滑断裂的耦合关系,以明确该类断控型储层的分布规律。【研究结果】区内一间房组储集岩类型以生屑灰岩、砂屑灰岩、颗粒灰岩、泥晶灰岩为主,孔隙度与渗透率均较低。根据储集空间类型,储层可分为洞穴型储层、裂缝-孔洞型储层、裂缝型储层与孔洞型储层4类,洞穴型储层垂向上沿主干断层呈串珠状发育,裂缝-孔洞型、裂缝型与孔洞型储层沿断裂带状发育。【结论】走滑断裂的分段性控制着优质储层的分布,断裂马尾段、斜列段和叠覆段储层发育最佳,分支断层斜交段发育一般,线性段则发育较差,在此基础上,高能相带叠加区相对非叠加区储层发育更佳。

This paper is the result of oil and gas geological exploration engineering.[Objective]The carbonate reservoirs of the Ordovician Yijianfang Formation are developed in Yueman area,south of Tarim River in Halahatang oilfield,Tarim Basin.The exploration and development results show that the high-producing wells are mainly distributed along four strike-slip faults in the area,and the oil and gas production along the fault zone is different,with strong heterogeneity,and the reservoirs are obviously controlled by faults.Therefore,it is of great significance for oil and gas exploration and development to clarify the characteristics and distribution regularities of fault-controlled reservoirs.[Methods]In this paper,based on drilling logging data,cores data and 3D seismic data,the petrological characteristics,reservoir types and development regularities are analyzed,and the coupling relationship between high-quality reservoirs and strike-slip faults is discussed to clear the distribution regularities of such fault-controlled reservoirs.[Results]The reservoir rock types of Yijianfang Formation in the area are mainly bioclastic limestone,arenaceous limestone,granular limestone and micritic limestone,with low porosity and permeability.According to the types of reservoir space,the reservoirs can be divided into four types:cavernous reservoirs,vuggy reservoirs,fractured reservoirs and fractured-vuggy reservoirs.The cavernous reservoirs develop vertically along the main fault,the vuggy reservoirs,fractured reservoirs and fractured-vuggy reservoirs are banded distributed along the fault.[Conclusion]The structure of strike-slip faults controls the distribution of high-quality reservoirs,and the reservoir stratums in Horsetail,en echelon and overlap sections of faults are the best developed,the oblique intersection sections of branching faults are fair developed,while the linear sections are poorly developed.On this basis,the reservoirs in the superposition area of high-energy facies belts are better developed than those in the non-superposition area.