石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (6): 1468-1478.doi: 10.11743/ogg20230611
收稿日期:
2023-06-08
修回日期:
2023-10-02
出版日期:
2023-12-01
发布日期:
2023-12-20
通讯作者:
段宏亮
E-mail:fangzx.jsyt@sinopec.com;duanhl.jsyt@sinopec.com
第一作者简介:
方志雄(1962—),男,博士、教授级高级工程师,油气勘探开发研究与管理。E-mail:基金项目:
Zhixiong FANG1(), Qiusheng XIAO1, Dianwei ZHANG2, Hongliang DUAN1()
Received:
2023-06-08
Revised:
2023-10-02
Online:
2023-12-01
Published:
2023-12-20
Contact:
Hongliang DUAN
E-mail:fangzx.jsyt@sinopec.com;duanhl.jsyt@sinopec.com
摘要:
中国东部陆相断陷盆地群中-新生代发育多套巨厚的湖相富有机质页岩,蕴含丰厚的页岩油资源,但富有机质页岩普遍受断层切割,形成若干独立断块,与北美连续稳定分布的页岩地层条件存在较大差异,能否获得稳定的商业油流是勘探面临的首要问题。基于苏北盆地高邮凹陷古近系阜(阜宁组)二段页岩岩性、烃源岩品质、储层品质研究与综合评价,研究认为阜二段发育3套厚层有利层,具备“多层楼”立体勘探开发条件;基于阜二段有利层、断层和断块发育地质现状,提出水平井在同一断块内或跨断块、在同一或多个有利层长距离穿行的“断块型”页岩油勘探思路;根据断层断距与有利层厚度之间的配置关系,将“断块型”页岩油划分为“连续稳定”型、“微断层切割”型和“跨断块多甜点”型等3种勘探目标类型。通过勘探实践,证实3种勘探目标类型均可获得稳定的商业油流。研究成果丰富了中国陆相页岩油勘探领域和类型,对陆相断陷盆地页岩油勘探具有重要借鉴意义。
中图分类号:
图4
高邮凹陷阜二段富有机质页岩主要储集空间类型显微照片a.白云石条带中发育剪切缝,缝面局部被溶蚀,残留孔洞外渗原油,HY1井,埋深3 702.60 m,Ⅴ亚段,岩心;b.层理缝、顺层方解石脉含油,HY1井,埋深3 683.18 m,Ⅴ亚段,岩心;c.长英质粒间孔,含油,HY1井,埋深3 663.20 m,Ⅴ亚段,单偏光;d. H2井,埋深3 464.95 m,Ⅳ亚段,微米CT;e.白云石晶间溶孔,H2井,埋深3 466.59 m,Ⅳ亚段,单偏光;f.碳酸盐矿物粒内溶孔,HY1井,埋深3 667.57 m,Ⅴ亚段,SEM;g.黏土矿物粒内孔,HY1井,埋深3 657.13 m,Ⅴ亚段,SEM;h.有机质孔,H2井,埋深3 390.37 m,Ⅲ亚段,SEM"
表2
高邮凹陷阜二段各页岩层段关键参数"
地层 | 厚度/m | TOC/% | S1/(mg/g) | OSI/(mg/g) | 孔隙度/% | 脆性矿物含量/% | 综合评价 | |
---|---|---|---|---|---|---|---|---|
Ⅰ亚段 | 39 | 1.50 ~ 2.25(1.83) | 0.10 ~ 0.34(0.18) | 8 ~ 16(12) | 2.00 ~ 3.06(2.41) | 55 ~ 58(57) | 三类 | |
Ⅱ+Ⅲ亚段 | 65 | 1.08 ~ 3.63(2.36) | 0.66 ~ 5.07(2.75) | 61 ~ 142(117) | 2.09 ~ 5.56(3.42) | 61 ~ 72(68) | 一类、二类 | |
Ⅳ亚段 | Ⅳ-1 | 12 | 0.82 ~ 1.95(1.50) | 0.32 ~ 1.31(0.88) | 58 ~ 68(64) | 4.03 ~ 5.59(5.17) | 63 ~ 67(66) | 三类 |
Ⅳ-2—Ⅳ-7 | 74 | 1.12 ~ 3.65(1.75) | 0.72 ~ 4.28(1.78) | 60 ~ 189(127) | 3.33 ~ 6.29(5.38) | 57 ~ 68(62) | 一类、二类 | |
Ⅳ-8 | 4 | 0.92 ~ 1.04(0.95) | 1.27 ~ 1.29(1.28) | 127 ~ 129(128) | 4.49 ~ 4.56(4.54) | 63 ~ 65(64) | 二类、三类 | |
Ⅴ亚段 | Ⅴ-1—Ⅴ-3 | 35 | 0.22 ~ 1.47(0.83) | 0.24 ~ 1.98(0.53) | 73 ~ 218(160) | 4.03 ~ 5.63(5.09) | 64 ~ 73(70) | 二类、三类 |
Ⅴ-4—Ⅴ-9 | 65 | 0.72 ~ 3.12(1.24) | 0.65 ~ 5.12(2.52) | 63 ~ 412(193) | 3.49 ~ 8.30(5.24) | 61 ~ 74(69) | 一类、二类 | |
Ⅴ-10 | 3 | 0.82 ~ 1.11(0.92) | 0.14 ~ 0.30(0.22) | 16 ~ 31(24) | 5.16 ~ 7.43(5.60) | 62 ~ 65(64) | 三类 |
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