石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (1): 26-36, 49.doi: 10.11743/ogg20200103
李朋威1(), 何治亮2,*(), 罗平3, 金廷福4, 张英1, 冯建赟1, 宋金民4, 徐士林1
收稿日期:
2019-07-22
出版日期:
2020-02-01
发布日期:
2020-01-19
通讯作者:
何治亮
E-mail:lipw.syky@sinopec.com;hezl.syky@sinopec.com
第一作者简介:
李朋威(1983-),男,博士、高级工程师,沉积与储层地质研究。E-mail:基金项目:
Pengwei Li1(), Zhiliang He2,*(), Ping Luo3, Tingfu Jin4, Ying Zhang1, Jianyun Feng1, Jinmin Song4, Shilin Xu1
Received:
2019-07-22
Online:
2020-02-01
Published:
2020-01-19
Contact:
Zhiliang He
E-mail:lipw.syky@sinopec.com;hezl.syky@sinopec.com
Supported by:
摘要:
华北北部地区蓟县系高于庄组-雾迷山组白云岩储层以岩石与储集空间类型多样、孔隙结构与受控因素复杂以及非均质性强为特征,并由此制约了该区油气和地热等资源的勘探与开发。以野外露头和岩心为研究对象,开展了大量的野外地质考察、岩心观察、薄片鉴定与物性分析等研究工作,进一步总结分析了高于庄组-雾迷山组白云岩储层特征及其优质储层形成主控因素。研究结果表明,高于庄组-雾迷山组发育一套以微生物白云岩为主的储层类型,岩石结构构造复杂,其中,锥状叠层石和凝块石为其最有利的储集岩石类型。按照储集空间组合,可将储层划分为孔洞缝复合型、裂缝-孔隙型和孔隙型3种类型。其中,蓟县系雾迷山组白云岩储层以孔洞缝复合型为主,物性最好;高于庄组则以裂缝-孔隙型和孔隙型主,物性相对较差。综合分析认为,研究区高于庄组-雾迷山组规模优质白云岩储层是多种因素耦合作用的结果,其中微生物礁滩、印支期以来的构造隆升、破裂及溶蚀作用为其形成主控因素。
中图分类号:
图3
天津蓟县地区蓟县系高于庄组-雾迷山组白云岩微观特征 a.亮暗相间纹层,暗色纹层较厚,为0.2~0.5 mm,亮色纹层一般小于0.3 mm,叠层石白云岩,Jxw;b.由连续叠置生长的暗层和亮层组成,纹层宽0.01~0.1 mm不等,层纹石,Jxg;c.似球粒泥晶结构,大小较均匀,呈圆或椭圆状,色暗富含有机质,Jxw;d.凝块结构,凝块多为斑状或不规则状,亮晶胶结,凝块石白云岩,Jxw;e.残余凝块结构,凝块边缘较为模糊,亮晶胶结,残余凝块石白云岩,Jxw;f.核形石结构,具同心圈层,其直径一般大于2 mm,核形石白云岩,Jxw;g.纹层状泥晶白云岩,纹层不甚发育,近水平状,Jxw;h.砂砾屑白云岩,亮晶胶结,Jxw;i.残余凝块细-中晶白云岩,白云石以它型为主,可见锯齿状压溶缝,Jxw"
图4
华北北部地区蓟县系高于庄组-雾迷山组白云岩储层宏观与微观特征 a.岩溶洞穴,沿断裂发育,京东大溶洞,Jxg;b.岩溶洞穴,沿断裂发育,蓟州溶洞,Jxw;c.裂缝系统,至少可识别出2~3组裂缝,其中2组近垂直,蓟县双洞背斜,Jxw;d.针状溶孔,沿纹层发育,层状叠层石,Jxw;e.微生物格架相关孔隙,主要沿亮色纹层发育,丘状叠层石,Jxw;f.小型溶蚀孔洞,可见裂缝,Y33井,Jxw;g.溶蚀孔洞发育,M41井,Jxw;h.溶蚀孔洞,GH1井,Jxw;i.溶蚀孔与裂缝,叠层石白云岩,Jxw;j.晶间溶蚀孔洞,残余凝块白云岩,蓟县,Jxw;k.晶间溶孔与构造缝,残余凝块白云岩,蓟县,Jxw;l.晶间溶孔洞,残余凝块晶粒白云岩,R28井,Jxw"
表2
中、新元古界主要碳酸盐岩储层孔、渗特征"
储层 | 岩性 | 孔隙度/% | 渗透率/(10-3 μm2) | 样品数/个 | ||||||
最小 | 最大 | 平均 | 最小 | 最大 | 平均 | |||||
青白口系 | 景儿峪组 | 灰岩 | 0.53 | 5.63 | 4.33 | < 0.01 | 0.02 | 0.08 | 3 | |
蓟县系 | 铁岭组 | 灰岩 | 0.90 | 2.14 | 1.52 | 0.01 | 0.09 | 0.05 | 2 | |
雾迷山组 | 白云岩 | 0.48 | 9.40 | 2.30 | < 0.01 | 45.90 | 0.25 | 50 | ||
杨庄组 | 白云岩 | 1.50 | 4.30 | 2.20 | < 0.01 | 6.70 | 0.05 | 9 | ||
高于庄组 | 白云岩 | 0.27 | 5.31 | 2.18 | < 0.01 | 0.57 | 0.05 | 20 | ||
长城系 | 团山子组 | 白云岩 | 1.10 | 8.50 | 1.50 | < 0.01 | 0.58 | 0.06 | 5 |
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