塔里木盆地新垦地区奥陶系层间岩溶储层形成机制与控制因素

塔里木盆地新垦地区奥陶系层间岩溶地区缝洞发育，是塔北油气勘探的有利地区。通过储层发育特征分析，发现该区储层主要以裂缝-孔洞及溶洞型储层发育为主，纵向上主要发育在一间房组顶面以下100 m范围内；根据沉积环境、古地貌恢复、岩溶作用条件分析，认为台地相沉积的较纯灰岩是岩溶的基础，多期岩溶作用是优质缝洞储层发育的主要因素，其中一间房暴露期岩溶形成了早期的孔隙，而在这基础上，良里塔格暴露期地下水顺层区域径流岩溶，形成了一间房组、鹰山组大型缝洞空间，该期岩溶是层间岩溶区优质储层形成的最主要时期。在岩溶过程中，断裂或深切河谷控制了地下水径流、排泄方向，即控制了岩溶缝洞储层的分布。根据以上结果，建立了新垦地区层间顺层岩溶模式，以此指导该区奥陶系油气勘探。 

Interlayer karst reservoir characteristics and development controlling factors of Ordovician in the Xinken area，Tarim basin

The fracture zone of the Ordovician system interlayer karst area in the Xinken area of of Tarim basin is a favorable area for oil and gas exploration in the north of Tarim basin in recent years. Analysis suggests that the reservoirs in this area are dominated by fracture-hole and karst reservoirs, and mainly in the longitudinal direction of 100 m below the top surface of the Yijianfang formation. Based on sedimentary environment, paleogeomorphology reconstruction and karst conditions, it is considered that the relatively pure limestone deposited on the platform facies is the foundation of karst. The karst exposure period of Yijianfang formation formed early small pores, while during the Lianglitage exposure period, underground water in bedding was the main factor to control the formation of interlayer karst reservoirs. In the karst process, faults controlled the groundwater runoff and drainage direction, i.e. determining the distribution of the karst fracture cave reservoirs. Based on the above results, a bedding karst model for the Xinken area was established to guide oil and gas exploration of the Ordovician system in this area.