石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (2): 305-315.doi: 10.11743/ogg20200207
焦小芹1,2(), 牛花朋1,2,*(), 谢庆宾1,2, 张永庶3, 李俊巍1,2, 吴志雄3, 王波3, 李欣1,2
收稿日期:
2019-01-29
出版日期:
2020-04-28
发布日期:
2020-04-03
通讯作者:
牛花朋
E-mail:jiaoxiaoqin0109@163.com;niuhuapeng@126.com
作者简介:
焦小芹(1995-),女,硕士研究生,岩石学与储层地质学。E-mail:基金资助:
Xiaoqin Jiao1,2(), Huapeng Niu1,2,*(), Qingbin Xie1,2, Yongshu Zhang3, Junwei Li1,2, Zhixiong Wu3, Bo Wang3, Xin Li1,2
Received:
2019-01-29
Online:
2020-04-28
Published:
2020-04-03
Contact:
Huapeng Niu
E-mail:jiaoxiaoqin0109@163.com;niuhuapeng@126.com
摘要:
尖北斜坡为柴达木盆地阿尔金山前东段天然气勘探重点区域之一,目前针对该区域基岩储层发育特征和成藏条件的分析研究尚很薄弱。在岩心观察、薄片鉴定的基础上,结合常量元素分析、XRD、SEM、压汞测试和井震资料分析,对柴达木盆地尖北斜坡基岩储层的发育特征及天然气成藏的有利地质条件进行了研究。结果表明,尖北斜坡基岩储层岩石类型主要为花岗闪长岩、花岗岩和片岩;发育风化壳型储层,其中半风化层孔渗物性最好;储集空间为基质微孔、溶蚀孔和裂缝,储层孔隙度主要分布在2.23%~3.77%,渗透率均值为0.06×10-3 μm2,以Ⅱ类中等储层为主;基岩储层临近坪东以西侏罗系生烃凹陷,天然气自生烃凹陷沿基岩基底发育的深大断裂和不整合发生运移,经基岩顶部古近纪咸湖环境下形成的膏泥岩有效封堵,最终在更新世晚期形成的断背斜圈闭内富集成藏,发育基岩顶部风化壳型气藏。该研究成果对指导尖北斜坡基岩气藏下一步勘探具有重要的指导意义。
中图分类号:
图6
柴达木盆地尖北斜坡基岩储层特征 a.花岗闪长岩,粘土矿物伊利石发育基质微孔,尖探1井,埋深4 645.9 m,扫描电镜;b.花岗闪长岩,云母片间发育基质微孔,尖探1井,埋深4 945.87 m,扫描电镜;c.花岗闪长岩,粒内溶蚀孔,尖北101井,4 751.68 m,铸体薄片(-)X100;d.花岗闪长岩,粒间溶蚀孔,尖探1井,埋深4 645.44 m,铸体薄片(-)X100;e.花岗闪长岩,构造缝,尖探1井,埋深4 645.87 m,阴极发光;f.花岗闪长岩,云母内发育解理缝,尖探1井,埋深4 641.86 m,阴极发光;g.花岗闪长岩,溶蚀缝,尖探1井,4 644.22 m,铸体薄片(-)X100;h.花岗闪长岩,长石内溶蚀缝,尖探1井,埋深4 645.9 m,扫描电镜Qtz.石英;Kfs.钾长石;Anh.硬石膏;Cc.方解石;C.有机质"
表1
柴达木盆地尖北斜坡花岗闪长岩储层孔隙结构"
样品 | 孔隙度/ % | 渗透率/ 10-3 μm2 | 最大连通孔喉半径/ μm | 最大进汞饱和度/ % | 退汞效率/ % | |
井名 | 深度/m | |||||
尖探1井 | 4 639.73 | 2.31 | 0.04 | 3.868 | 66.52 | 28.1 |
尖探1井 | 4 640.33 | 3.18 | 0.03 | 0.758 | 77.37 | 23.2 |
尖探1井 | 4 640.82 | 3.57 | 0.03 | 0.468 | 73.61 | 30.0 |
尖探1井 | 4 641.98 | 4.95 | 0.03 | 0.714 | 73.62 | 25.9 |
尖探1井 | 4 642.95 | 1.98 | 0.03 | 1.267 | 61.43 | 20.4 |
尖探1井 | 4 644.22 | 2.43 | 0.03 | 1.289 | 63.49 | 25.7 |
尖探1井 | 4 645.25 | 4.78 | 0.03 | 0.799 | 57.58 | 23.9 |
尖探1井 | 4 645.93 | 2.68 | 0.02 | 1.148 | 54.38 | 17.8 |
尖探1井 | 4 646.36 | 3.52 | 0.02 | 3.341 | 82.33 | 21.9 |
尖探1井 | 4 647.70 | 2.14 | 0.01 | 4.083 | 76.74 | 22.9 |
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