摘要
四川盆地高磨地区震旦系灯影组第四段(以下简称灯四段)储层属于典型的低孔隙度、低渗透率古岩溶海相碳酸盐岩地层,储层受沉积及古岩溶作用的影响,横向上顺藻叠层溶蚀孔洞发育,纵向上储层单层厚度分布不均,纵横向变化大,各向异性明显,非均质性强。为了解决常规测井储层评价技术已经很难适用于该区灯四段复杂孔洞型储层的有效评价问题,以灯四段碳酸盐岩储层为研究对象,分析了碳酸盐岩溶蚀测井电相特征,结合取心井段对溶蚀特征进行刻度,对研究区进行溶蚀测井电相划分。研究结果表明:①通过引入PoroTex技术,结合电成像测井,深化其在震旦系灯四段储层评价中的应用,能够最大限度地消除对复杂缝洞储层测井识别和评价中出现的模糊性和不确定性;②建立了5个溶蚀测井电相,分别为孔洞溶蚀相、洞穴溶蚀相、裂缝-孔洞溶蚀相、致密相及暗色薄层相,溶蚀测井电相特征与岩心溶蚀特征对应关系良好,孔洞溶蚀相、洞穴溶蚀相为识别出的有利储层。结论认为,溶蚀测井电相为单井储层纵向上分布规律以及多井横向对比分析奠定了良好的基础,为储层特征、成因及分布规律研究提供了定量依据。
The reservoirs of Sinian Dengying 4 Member,Gaoshiti-Moxi area,Sichuan Basin,are typical paleo-karst marine carbonate ones with low porosity and permeability,which may be influenced by sedimentation and paleo-karstification.Laterally,dissolution pore and vug are developed along algal stromatolite,whereas vertically,single-layer thickness is not distributed uniformly.Great change in the lateral and vertical brings about obvious anisotropy and strong heterogeneity.Most conventional well-logging technologies are hardly to effectively evaluate these reservoirs with complex types of pore and vug.So,the Dengying 4 carbonate reservoirs were taken as objectives to analyze the electrofacies characteristics of carbonate dissolution.Then,combined with coring intervals,the dissolution characteristics were scaled and the dissolution electrofacies were classified.Results show that(1)deepening the application of PoroTex technology and electric imaging logging to reservoir evaluation can eliminate several ambiguity and uncertainty in logging recognition and evaluation on these reservoirs with complex fracture and vug as much as possible;and(2)there are five dissolution electrofacies established,including pore dissolution electrofacies,vug dissolution electrofacies,fracture-pore dissolution electrofacies,tight electrofacies,and dark thin-layer electrofacies.Their characteristics correspond better to the dissolution characteristics of cores.Both pore and vug dissolution electrofacies are identified as favorable reservoirs.In conclusion,dissolution electrofacies lay solid foundation for single-well vertical reservoir distribution law and multi-well lateral comparative analysis,and provide quantitative basis for the research of reservoir characteristics,genesis,and distribution law.
作者
白利
金燕
夏小勇
彭骁
莫静
BAI Li;JIN Yan;XIA Xiaoyong;PENG Xiao;MO Jing(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;Schlumberger China Co.,Ltd.,Chengdu,Sichuan 610500,China)
出处
《天然气技术与经济》
2022年第1期17-23,共7页
Natural Gas Technology and Economy
基金
国家科技重大专项“四川盆地大型碳酸盐岩气田开发示范工程”(编号:2016ZX05052)子课题“大型裂缝—孔洞型碳酸盐岩气藏地球物理评价及预测技术研究与应用”。
关键词
四川盆地
震旦系灯影组
碳酸盐岩储层
电成像测井
溶蚀测井电相
孔缝洞
Sichuan Basin
Sinian Dengying Formation
Carbonate reservoir
Electric imaging logging
Dissolution electrofacies
Pore,fracture,and vug.
