石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (4): 923-936.doi: 10.11743/ogg20230410
收稿日期:
2023-02-20
修回日期:
2023-05-05
出版日期:
2023-08-01
发布日期:
2023-08-09
第一作者简介:
邓勇(1975—),男,教授级高级工程师,海上石油地质与综合勘探。E-mail: 基金项目:
Yong DENG(), Caiwei FAN, Desheng HU, Weijun HE, Jianxin ZHANG
Received:
2023-02-20
Revised:
2023-05-05
Online:
2023-08-01
Published:
2023-08-09
摘要:
北部湾盆地涠西南凹陷是中国南海海域重要的常规和非常规油气勘探开发区域,2022年7月WY-1井页岩油压裂测试成功并获得商业油气流,标志着中国海上页岩油勘探取得重大突破。基于岩心、薄片、矿物组成、有机地化、扫描电镜、基质孔渗和精细测井分析,开展了涠西南凹陷WY-1井的页岩油储层非均质性特征研究。结果表明:WY-1井流沙港组二段下亚段(流二下亚段)可识别出富硅黏土质泥岩相、混合质泥岩相、富黏土硅质粉砂岩相和(混合)硅质砂岩相4类岩相。对该4类岩相的物性、孔喉特征、可动性和脆性进行分析发现,储集空间以粒间孔为主,(混合)硅质砂岩相孔渗值最高、可压性最好、可动性最高,为有利岩相,富黏土硅质粉砂岩相次之,混合质泥岩相与富硅黏土质泥岩相较差,但混合质泥岩相可压性与可动性好于富硅黏土质泥岩相。有利于储层发育的顺序为(混合)硅质砂岩相>富黏土硅质粉砂岩相>混合质泥岩相>富硅黏土质泥岩相。从储集性的纵向展布特征来看,流二下亚段底部储集性、可动性和可压性最好,其岩相主要为(混合)硅质砂岩相和富黏土硅质粉砂岩相互层;流二下亚段中部混合质泥岩相与富硅黏土质泥岩相互层分布,其脆性和可压性较流二下亚段上部好。综合评价认为,WY-1井甜点段主要为(混合)硅质砂岩相和富黏土硅质粉砂岩相以互层形式分布的流二下亚段下部,其次为混合质泥岩相较为发育的流二下亚段中部。
中图分类号:
表1
北部湾盆地涠西南凹陷流二下亚段岩相划分和WY-1井各岩相厚度占比"
岩相类型 | 矿物组成 | 构造 | 粒径/μm | TOC/% | 厚度占比/% |
---|---|---|---|---|---|
富硅黏土质泥岩相 | 黏土矿物:50 % ≤Φ< 80 % 碳酸盐矿物:Φ< 10 % | 层状 | <32.0 | (3.78 ~ 8.14)/5.72 | 60.23 |
混合质泥岩相 | 黏土矿物:20 % ≤Φ< 50 % 碳酸盐矿物:20 % ≤Φ< 50 % | 层状 | <32.0 | (0.86 ~ 9.54)/5.19 | 32.76 |
富黏土硅质粉砂岩相 | 碳酸盐矿物:Φ< 10 % 长英质矿物:50 ≤Φ< 80 % | 层状 | 32.0 ~ 62.5 | (0.49 ~ 3.79)/1.58 | 6.26 |
(混合)硅质砂岩相 | 碳酸盐矿物:Φ≥10 % 长英质矿物:Φ≥50 %(混合硅质砂岩相)或Φ≥80 %(硅质砂岩相) | 块状 | >62.5 | (0.51 ~ 0.66)/0.56 | 0.75 |
图3
北部湾盆地涠西南凹陷WY-1井流二下亚段不同岩相岩心照片a.富硅黏土质泥页相,层状构造,见含粉砂纹层和黄铁矿结核,埋深3 005.66 ~ 3 005.79 m;b.混合质泥岩相,层状构造,见沥青团块、含黄铁矿纹层,埋深3 007.50 ~ 3 007.62 m;c.富黏土硅质粉砂岩相,发育变形构造,埋深3 028.78 ~ 3 028.89 m;d.富黏土硅质粉砂岩相,发育变形构造、火焰构造、流水波纹构造,埋深3 027.62 ~ 3 027.77 m;e.(混合)硅质砂岩相,块状构造,埋深3 027.28 ~ 3 027.41 m;f.(混合)硅质砂岩相,块状构造,底部发育冲刷面,见正粒序,埋深3 026.87 ~ 3 027.00 m"
图4
北部湾盆地涠西南凹陷WY-1井流二下亚段不同岩相镜下特征a.富硅黏土质泥岩相,层状构造,见富有机质纹层、藻碎屑,埋深3 015.90 m,单偏光;b.混合质泥岩相,层状构造,见富有机质纹层、藻碎屑、富方解石团块,埋深3 009.84 m,单偏光;c.混合质泥岩相,层状构造,见富方解石团块,埋深3 009.84 m,正交光;d.富黏土硅质粉砂岩相,发育富黏土层,埋深3 028.80 m,单偏光;e.富黏土硅质粉砂岩相,见较多针状白云母,埋深3 028.80 m,正交光;f.(混合)硅质砂岩相,块状构造,见铁白云石,埋深3 027.33 m,单偏光;g.(混合)硅质砂岩相,块状构造,见铁白云石,埋深3 027.33 m,正交光;h.(混合)硅质砂岩相,块状构造,埋深3 026.93 m,单偏光;i.(混合)硅质砂岩相,块状构造,埋深3 026.93 m,正交光"
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