石油与天然气地质 ›› 2025, Vol. 46 ›› Issue (1): 288-303.doi: 10.11743/ogg20250120
吴丰1(
), 梁芸2, 唐松3, 李昱翰3, 田兴旺4, 杨辉廷1, 李锋5
收稿日期:2024-04-29
修回日期:2024-12-23
出版日期:2025-02-28
发布日期:2025-03-03
第一作者简介:吴丰(1983—),男,副教授,测井原理及地质应用。E‑mail: wfswpu@126.com。
基金项目:
Feng WU1(
), Yun LIANG2, Song TANG3, Yuhan LI3, Xingwang TIAN4, Huiting YANG1, Feng LI5
Received:2024-04-29
Revised:2024-12-23
Online:2025-02-28
Published:2025-03-03
摘要:
沥青广泛存在于深层碳酸盐岩储集空间中,沥青不仅严重影响储层物性与含气性,还导致储层测井电阻率响应复杂,增加了含沥青碳酸盐岩储层有效性评价、流体性质判别与含水饱和度计算的难度。以四川盆地安岳气田高石梯—磨溪地区寒武系龙王庙组含沥青溶孔-溶洞型碳酸盐岩为研究对象,开展微米CT扫描数据分析研究,采用数字岩心技术对储层孔隙结构和沥青充填特征进行表征,建立不同沥青含量和不同含水饱和度条件下的三维岩石导电模型,利用有限元方法开展岩石导电数值模拟,研究了沥青对碳酸盐岩导电特性的影响机理。研究结果表明:①含沥青溶洞型与溶孔型碳酸盐岩电阻率值与沥青含量呈正相关、与含水饱和度呈负相关。②溶孔型碳酸盐岩的狭窄喉道更易被沥青堵塞,使其导电性受沥青的影响较溶洞型碳酸盐岩更大。③低含水饱和度状态下,地层水主要以束缚水膜的形式赋存于储集空间表面,沥青使束缚水膜变得不完整,导致溶洞型和溶孔型碳酸盐岩电阻率急剧增大。④相比含沥青溶洞型碳酸盐岩,含沥青溶孔型碳酸盐岩具有更大的胶结指数(m)和更小的饱和度指数(n)。
中图分类号:
图4
四川盆地高石梯—磨溪地区龙王庙组碳酸盐岩储集空间沥青充填特征(铸体薄片显微照片)a.MX9井,灯四段,埋深5 046.31 m,溶洞中沥青呈团块状半充填;b.GS1井,灯四段,埋深4 960.22 m,溶洞中沥青呈团块状半充填;c.MX204井,龙王庙组,埋深4 656.59 m,溶洞中沥青呈环边状附着半充填;d.MX13井,灯四段,埋深4 608.64 m,溶洞中沥青呈环边状附着半充填;e.MX8井,灯四段,埋深5 111.81 m,半径较大粒间溶孔中沥青呈边缘半充填;f.MX10井,灯二段,埋深5 466.52 m,半径较小粒间溶孔中沥青全充填;g.HS1井,灯二段,埋深5 326.00 m,晶间溶孔中沥青半充填;h.GS1井,灯四段,埋深4 957.76 m,晶间溶孔中沥青半充填;i.W117井,灯三段,埋深2 997.50 m,裂缝沥青全充填"
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