塔里木盆地轮古东地区奥陶系碳酸盐岩储层评价和预测

在构造破裂作用和成岩作用共同控制下,轮古东地区奥陶系碳酸盐岩储层类型主要为溶洞裂缝体系,储层以裂缝型储层为主,裂缝孔洞型储层次之。奥陶系不同层位储层发育特征不同,鹰山组上部-一间房组-吐木休克组下部有效储层厚度分布段有260-300m;有效储层主要发育在滩相颗粒灰岩带内,呈层状分布。良里塔格组有效储层主要分布在良里塔格组的礁滩体灰岩带内,成透镜状分布。储层分布图表明岩溶作用在该地区表现为顺层岩溶造成某些层段的溶洞非常发育,而构造断裂作用于奥陶系碳酸盐岩表现为沿大断裂和平移断层带附近储层裂缝非常发育。

THE EVALUATION AND PREDICTION OF CARBONATE RESERVOIRS OF ORDOVICIAN IN EASTERN LUNGU REGION,TARIM BASIN

Under mutual-controlling of tectonic disruption action and diagenesis,the main type of Ordovician carbonate reservoir is cave-fissure system in eastern Lungu region.The main type of reservoir is fissure,and fracture-vug takes second place.Different Ordovician formations have different characteristics of developed reservoirs,and the range of effective thickness of reservoir of upper formation of Yingshan-Yijianfang-lower part of Tumuxiuke is 260-300m.The main effective reservoirs mainly develop in grain limestone of bank-facies,and appears in bedded.The main effective reservoir of formation of Lianglitage distributes in belt of reef flat limestone,and appears as lenticular.The graph of distribution reservoir indicates that karstification in the study area expresses that well-developed cave of certain layers are caused by bedding karstification,while structure fault acts in the Ordovician reservoir expresses that well-developed fractures distribute along the huge fault and near the belt of flaw fault.