Oil & Gas Geology ›› 2023, Vol. 44 ›› Issue (6): 1418-1429.doi: 10.11743/ogg20230607
• Petroleum Geology • Previous Articles Next Articles
Dongfeng HU(), Zhihong WEI, Ruobing LIU, Xiangfeng WEI, Wei WANG, Qingbo WANG
Received:
2023-06-25
Revised:
2023-08-17
Online:
2023-12-01
Published:
2023-12-20
CLC Number:
Dongfeng HU, Zhihong WEI, Ruobing LIU, Xiangfeng WEI, Wei WANG, Qingbo WANG. Discovery of the Qijiang shale gas field in a structurally complex region on the southeastern margin of the Sichuan Basin and its implications[J]. Oil & Gas Geology, 2023, 44(6): 1418-1429.
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Table 1
Basic parameters of the Qijiang shale gas field"
气田名称 | 綦江页岩气田 | 气藏类型 | 页岩气藏 |
---|---|---|---|
地理位置 | 重庆市綦江区和贵州省遵义市习水县 | 发现井 | DY2井(2013年) |
构造特征 | 主体区构造相对平缓,断裂不太发育 | 发现井产量/(m3/d) | 测试流量10.42×104 |
发现依据 | 利用中国南方海相页岩气“二元富集”规律认识,开展川东南五峰组-龙马溪组页岩气的整体评价和目标优选,发展和完善了海相页岩气富集规律认识,攻关深层页岩气关键工程工艺技术,发现了綦江页岩气田 | 页岩气探明地质 储量/m3 | 1 459.68×108(2022年) |
含气面积/km2 | 177.58 | ||
储量丰度/(m3/km2) | 1.40×108 | ||
页岩气层特征 | 首期探明储量含气范围内气藏特征 | ||
页岩气层位 | 五峰组-龙马溪组一段 | 分布特征 | 纵向上连续,中间无隔层,平面上大面积层状分布 |
岩性 | 灰黑色含放射虫炭质笔石页岩、含炭含粉砂泥岩、含炭质笔石页岩、含粉砂泥岩 | 含气高度/m | 1 950 |
页岩气层厚度/m | 80~90 | 气藏中部深度埋深/m | 3 354 |
TOC/% | 1.05~6.67,平均值2.62 | 气藏中部深度压力/MPa | 49.35 |
干酪根类型 | Ⅰ型,Ⅱ型 | 气藏压力系数 | 0.98~1.98,平均1.50 |
热演化程度(Ro)/% | 2.08~2.56,平均值2.31 | ||
孔隙度/% | 2.10~8.80,平均值4.53 | 地温梯度/(℃/km) | 25.1~31.3 |
渗透率/(10-3 μm2) | 0.000 1~9.850 0,几何平均值0.018 0 | ||
黏土矿物含量/% | 28.2~55.8,平均值39.9 | 天然气组分含量/% | 以甲烷为主,含量97.99~98.54;低含二氧化碳,含量0.37~0.69;不含硫化氢 |
总含气量/(m3/t) | 2.82~12.06,平均值5.43 | 天然气类型 | 过成熟干气 |
含气饱和度/% | 66.8~74.4,平均值67.7 | 天然气来源 | 五峰组-龙马溪组一段 |
Table 2
Summary of seismic prediction methods for shale gas sweet spots in the Qijiang shale gas field"
参数 | 老方法 | 新方法 |
---|---|---|
TOC | 波阻抗反演法 | 叠前密度反演方法:TOC =aρ+b |
孔隙度 | 声波法 | 声波密度法:?=a×AC+b×ρ+c |
压力系数 | Eaton和Filloppone方法等 | 扰动体积模量法: |
脆性 | 多元回归法 | 脆延性校正因子法:BI = f(ν)BI矿物 |
含气量 | TOC单参数法 | 二元模型法:Gas=a×TOC×pc + b |
裂缝 | 振幅椭圆拟合法 | 二阶傅里叶系数法:A2 ∝ e×sin2θ |
地应力 | 薄板理论法 | 应力背景约束法: |
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