摘要
塔里木盆地寒武系盐下及震旦系白云岩岩性复杂、基质岩块孔隙度渗透率低、储层发育溶蚀孔洞及网状裂缝,各向异性强,岩样实验无法完全代表白云岩储层岩石物理特征,严重制约了测井参数建模。通过井下与野外露头地质特征对比,选取什艾日克剖面露头大尺寸岩样,开展大尺寸岩样岩石物理实验,以提升实验结果的代表性。(1)依据核磁共振T2谱、CT扫描微观孔隙分布等关键参数将储层孔隙结构划分为4种类型,并确定了不同级别储层有效性评价依据。(2)相对致密白云岩声波孔隙度、氦气法孔隙度和核磁孔隙度基本吻合;孔洞发育型白云岩声波孔隙度小于氦气法和核磁孔隙度。(3)建立了不同孔隙结构类型的岩电参数模型。实验结果可为白云岩储层类型评价、测井储层解释及地质认识深化提供借鉴。
The Cambrian sub-salt and Sinian dolomites in Tarim Basin exhibit complex lithologies,low porosity and low permeability of matrix rock samples,well-developed dissolution vugs and reticular fractures,and strong reservoir anisotropy.The experimental results of plug-sized samples cannot fully represent the petrophysical properties of dolomite reservoirs,severely restricting the modeling using logging parameters.By comparing the geological characteristics between downhole and field outcrop samples,large-sized outcrop rock samples in Shiarik section have been selected to conduct petrophysical experiments to enhance the representativeness of experimental results:(1)Based on key parameters such as nuclear magnetic resonance(NMR)T2 spectrum and CT scanning microscopic pore distribution,the reservoir pore structure has been classified into four types,and evaluation criteria for reservoir effectiveness at different levels have been established.(2)The acoustic porosity,helium porosity,and NMR porosity of tight dolomite reservoir are generally consistent,while the acoustic porosity of vuggy type dolomite reservoir is lower than the helium method and NMR measured porosity.(3)The petrophysical-electric parameter models have been established for reservoirs with different pore structure types.The experimental results provide reference for the evaluation of dolomite reservoir types,reservoir logging interpretation,and the deepening of geological understanding.
作者
段文星
信毅
陈旭
黄若坤
唐保勇
李清山
陈梦玲
邓茜雯
DUAN Wenxing;XIN Yi;CHEN Xu;HUANG Ruokun;TANG Baoyong;LI Qingshan;CHEN Mengling;DENG Qianwen(PetroChina Tarim Oilfield Company,Korla 841000,China;R&D Center of Ultra-deep Complex Oil and Gas Reservoir Exploration and Development,CNPC,Korla 841000,China;Xinjiang Engineering Research Center of Ultra-deep Complex Oil and Gas Reservoir Exploration and Development,Korla 841000,China)
出处
《深地能源科技》
2025年第5期45-56,共12页
Deep Earth Energy Science & Technology
基金
中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心攻关项目“超深复杂油气藏测井技术与现场试验”(YF202402)
中国石油塔里木油田公司科研项目“台盆区勘探测井技术攻关研究”(T202425)。
