测井资料划分川东北元坝地区长兴组有利相带  

Recognition of favorable facies belts in the Changqing Formation of the Yuanba area in the northeastern Sichuan Basin through logging data

作　　者：张筠[1] 吴见萌[1] 

机构地区：[1]中国石化集团西南石油局测井公司

出　　处：《天然气工业》2011年第7期24-27,103-104,共4页Natural Gas Industry

摘　　要：晚二叠世长兴期,四川盆地东北部元坝地区位于梁平—开江陆棚西侧,由西南向东北发育开阔台地、台地边缘礁滩、斜坡、浅水陆棚沉积相带。综合利用成像测井、常规测井及岩屑薄片鉴定等资料,在元坝长兴组单井相划分的基础上,对其沉积亚相和微相进行了划分,结合实钻成果分析,认为台地边缘生物礁的礁盖和礁核是优质储层分布区域。充分发挥测井信息纵向分辨率及地震信息横向分辨率的优势,在岩心标定测井资料的基础上,根据测井资料来标定地震资料,将测井相与地震相紧密结合,对长兴组有利相带沉积特征做了进一步的精细刻画。依据这些信息,能较为明显地划分出元坝地区长兴组的有利相带。结果表明:该区有利相带为台地边缘礁滩相沉积,亚相为生物礁和礁后浅滩,微相为礁盖、礁核、生屑滩和砂屑滩,这类相带的储层是勘探开发的首选目标。The Yuanba area was located in the west of Liangping-Kaijiang shelf at the Late Permian Changxing stage when the sedimentary facies belts from southwest to northeast were open platforms,platform margin reefs/banks,slopes and shallow shelf shelves respectively.Various data including image logging,conventional logging and thin-section analysis are integrated to identify sedimentary subfacies and microfacies of the Changxing Formation in the Yuanba area based on per-well sedimentary facies division.Drilling data reveal that quality reservoirs occur mostly in reef caps and reef cores of the bioherms at the platform margin.The high vertical resolution of logging data and the high lateral resolution of seismic data are brought into full play.Logging data are first calibrated according to core data and then used to calibrate seismic data,realizing full integration of logging facies and seismic facies for fine characterization of favorable facies belts in the Changxing Formation.The favorable facies belts are platform margin reef/bank facies,favorable subfacies are bioherm and backreef beach,favorable microfacies are reef caps,reef cores,bioclastic banks and arenaceous banks.Reservoirs in these favorable facies belts are the primary exploration targets.

关 键 词：四川盆地 元坝地区 晚二叠世 礁滩相 成像测井 测井相 地震相 有利相带 

分 类 号：P631.81[天文地球—地质矿产勘探]