石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (4): 1155-1167.doi: 10.11743/ogg20240418
郭原草1,2(), 郭建华2,3(), 劳海港4, 李智宇3, 余烨2, 陈广3, 吴诗情3, 黄俨然2
收稿日期:
2023-10-11
修回日期:
2024-05-10
出版日期:
2024-09-05
发布日期:
2024-09-05
通讯作者:
郭建华
E-mail:xctmac@sina.cn;gjh796@csu.edu.cn
第一作者简介:
郭原草(1984—),男,博士、讲师,沉积学与石油地质学,E-mail:xctmac@sina.cn。
基金项目:
Yuancao GUO1,2(), Jianhua GUO2,3(), Haigang LAO4, Zhiyu LI3, Ye YU2, Guang Chen3, Shiqing WU3, Yanran HUANG2
Received:
2023-10-11
Revised:
2024-05-10
Online:
2024-09-05
Published:
2024-09-05
Contact:
Jianhua GUO
E-mail:xctmac@sina.cn;gjh796@csu.edu.cn
摘要:
为揭示琼东南盆地松南低凸起YA区花岗岩潜山型油气藏发育机理与成藏规模,运用岩心、物性、元素、磷灰石裂变径迹分析测试资料及测井-地震解释,研究了区内花岗岩潜山风化壳储层特征及发育控制因素、风化壳发育史及残余厚度分布。研究表明:YA区花岗岩系形成于印支期早三叠世,盆地基底在古新世—中新世经历多次构造抬升及沉降,风化壳分两期形成并得以保存,区内热带季风型古气候促进了花岗岩系化学风化作用。区域构造演化、古气候及岩石类型是控制区内古潜山风化壳发育的主要因素。风化壳发育程度存在显著差异性,区内古构造高点处的花岗岩风化壳残余厚度大。YA区花岗岩具有显著的钙碱性-碱性、准铝质-过铝质特征,属于易风化岩石类型。区内风化壳垂向上可分为残积-坡积层、砂化层、风化裂缝层、水平潜流层和基岩层。风化裂缝层是最有利储层,平均孔隙度为11.46 %,平均渗透率为5.98×10-3 μm2,物性随深度增加逐渐变差。花岗岩风化壳在测井曲线上呈现高自然伽马值、高电阻率、低密度和高声波时差等特征,测井指标变化趋势与物性变化趋势基本吻合。地震波反射属性高异常程度与风化壳裂缝发育程度基本呈正相关规律。
中图分类号:
图4
琼东南盆地松南低凸起YA区潜山岩心照片a.砂化层,YA-32井,埋深2 910 m; b.风化裂缝层,YA-11井,埋深2 974 m,砾状,破碎严重; c.风化裂缝层,YA-11井,埋深3 006 m,张性裂缝中见泥质充填; d.水平潜流层; YA-11井,埋深3 058 m,见溶蚀孔洞; e.风化裂缝层,YA-12井,埋深3 323 m,高角度裂缝见后期矿物充填,裂缝密度1~3条/dm; f.风化裂缝层,YA-12井,埋深3 356 m,裂缝充填脉中见溶蚀孔洞; g.水平潜流层,YA-12井,埋深3 470 m,裂缝充填脉中见溶蚀孔洞;h.风化裂缝层,YA-31井,埋深2 833 m,网状高角度裂缝"
表1
琼东南盆地松南低凸起YA-32井测井数据统计"
潜山分层 | 伽马射线强度/API | 声波时差/(μs/m) | 电阻率/(Ω·m) | 体积密度/(g/cm3) | 中子孔隙度/% |
---|---|---|---|---|---|
残积坡积层 | 33.4 ~ 215.5(120.1) | 0 ~ 432.30(342.43) | 6.19 ~ 6.19(6.19) | 1.78 ~ 2.44(2.27) | 15.60 ~ 52.20(26.60) |
砂化层 | 50.3 ~ 143.6(101.4) | 176.46 ~ 372.94(281.75) | 0 ~ 8.82(3.24) | 1.70 ~ 2.47(2.04) | 14.90 ~ 65.20(46.90) |
风化裂缝层 | 64.2 ~ 158.0(121.1) | 174.82 ~ 424.10(243.38) | 3.71 ~ 208.68(21.80) | 1.12 ~ 2.66(2.39) | 3.40 ~ 59.50(14.90) |
水平潜流缝洞层 | 101.9 ~ 222.3(135.8) | 174.82 ~ 391.63(228.94) | 3.70 ~ 162.37(25.42) | 0.48 ~ 7.24(2.47) | 1.40 ~ 44.80(10.80) |
基岩层 | 105.4 ~ 207.1(133.0) | 157.77 ~ 285.69(219.10) | 6.03 ~ 182.99(29.66) | 1,76 ~ 2.64(2.47) | 2.20 ~ 28.20(11.00) |
表2
琼东南盆地松南低凸起YA-11井花岗岩风化壳储层常规物性测试部分数据"
样品编号 | 井深/m | 岩性 | 孔隙度/% | 渗透率/(10-3μm2) | 颗粒密度/(g/cm3) | 视密度/(g/cm3) |
---|---|---|---|---|---|---|
4-2 | 2 968 | 花岗岩 | 9.39 | 3.71 | 2.59 | 2.35 |
4-5 | 2 974 | 花岗岩 | 12.70 | 8.22 | 2.63 | 2.29 |
4-6 | 2 984 | 花岗岩 | 17.80 | 5.95 | 2.62 | 2.15 |
2-2 | 2 990 | 花岗岩 | 8.30 | 12.50 | 2.61 | 2.39 |
2-5 | 2 999 | 花岗岩 | 11.20 | 13.60 | 2.65 | 2.35 |
4-9 | 3 010 | 花岗岩 | 7.09 | 0.05 | 2.65 | 2.46 |
3-1 | 3 016 | 花岗岩 | 2.69 | 0.05 | 2.57 | 2.57 |
3-2 | 3 024 | 花岗岩 | 3.57 | 0.05 | 2.56 | 2.56 |
3-3 | 3 050 | 花岗岩 | 11.40 | 0.73 | 2.39 | 2.39 |
3-4 | 3 060 | 花岗岩 | 13.50 | 0.38 | 2.31 | 2.31 |
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