摘要
塔里木盆地轮古油田奥陶系油藏属于典型的非均质碳酸盐岩潜山油藏。采用补偿厚度印模法和残留厚度法进行古地貌恢复，将轮古油田二级古地貌自西向东划分为岩溶缓坡、岩溶台地、岩溶高地、峰丛谷地和岩溶盆地共5种类型。研究区奥陶系岩溶储层以洞穴型储层为主，可细分为山高洞大型和暗河连通型2种；目前已勘探开发的洞穴型储层主要发育于奥陶系潜山面以下0～135 m，不同埋深、不同区块洞穴型储层的充填特征存在较大差异，洞穴充填相可划分为化学沉积相、搬运型岩相、垮塌型岩相和渗流充填相4种类型；洞穴充填模式可划分为峡谷区顺河潜流型洞道充填模式、峡谷区伏流型洞道洪水回泛及深潜型洞道垮塌充填模式、顺河潜流垮塌落水洞充填模式和深潜流型竖井未充填模式4种。油气主要富集于轮古油田奥陶系潜山残丘高部位，沟谷趋势面指示原始的油水界面，不同井区控制油水界面的沟谷存在差异。
The Ordovician buried-hill reservoirs in Lungu oilfield belong to the typical heterogeneous carbonate reservoirs.The paleogeomorphology of this area was resumed by impressing and residual thickness methods,and the 2nd-grade pa-leogeomorphology of Lungu oilfield is divided into gentle karst slope,karst platform,karst highland,peak-cluster valley and karst basin from west to east. The type of Ordovician karst reservoir is dominated by cave reservoir,which can be further divided into high mountain with large caves type and interconnecting underground river type. At present,the caves found by exploration and development are mainly distributed less than 135 m below Ordovician buried hill surface,but the cave filling characteristics differ significantly in different burial-depths and different zones. The cave filling facies are divided into 4 types which are chemical deposition facies,transposition lithofacies,collapse-breccia facies and vadose fillingfacies;the cave filling models are also divided into 4 types:cave filling models of underflow along the river in gorge dis-tricts,flood backwater of swallet stream and cave collapse filling models of deep underflow in gorge districts,sinkhole filling models caused by collapse of underflow along the river and vertical shaft unfilling models of deep underflow. Oil and gas are mainly enriched in the upper part of the monadnock of Ordovician buried hill in Lungu oilfield. The trend surface of valleys can indicate the original oil-water interface,but the valleys that control the oil-water interface differ in different well blocks.
作者
韩杰
洪涛
朱永峰
刘俊锋
裴广平
袁源
吴萧
Han Jie;Hong Tao;Zhu Yongfeng;Liu Junfeng;Pei Guangping;Yuan Yuan;Wu Xiao(Exploration and Development Research Institute,Tarim Oilfield Company,CNPC,Korla,Xinjiang,841000,China;College of Geosciences,China University of Petroleum(Beijing),Beijing City,102249,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2016年第5期1-8,共8页
Petroleum Geology and Recovery Efficiency
基金
中国石油科技重大专项"塔里木油田勘探开发关键技术研究及应用"(22121G20112001)
关键词
暗河
沟谷
古地貌
洞穴型储层
碳酸盐岩潜山
轮古油田
underground rive
valleys
palaeogeomorphology
cave reservoir
carbonate buried hill
Lungu oilfield
