Reservoir Evaluation and Development ›› 2019, Vol. 9 ›› Issue (5): 1-13.
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FANG Zhixiong
Received:
2019-08-07
Online:
2019-10-26
Published:
2019-10-26
CLC Number:
Zhixiong FANG. Challenges and countermeasures for exploration and development of normal pressure shale gas in southern China[J]. Reservoir Evaluation and Development, 2019, 9(5): 1-13.
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Table 1
Comparison of geological characteristics between normal pressure shale gas and over-pressured shale gas"
项 别 | 常压页岩气 | 高压页岩气 |
---|---|---|
沉积特征 | 处于深水陆棚相上斜坡,优质页岩厚24~35 m,石英含量 >50 %,黏土矿物含量<30 % | 处于深水陆棚相下斜坡,优质页岩厚度38~45 m,石英含量40 %~50 %,黏土矿物含量30 %~40 % |
储集特征 | 基质孔隙度3.5 %~5.0 %,高角度缝及层理缝更发育 | 基质孔隙度4.0 %~6.0 %,高角度缝相对不发育 |
赋存状态 | 吸附气占比高(40 %~60 %) | 吸附气占比低(25 %~40 %) |
应力特征 | 地应力相对较小,40~60 MPa,最大水平主应力和最小 水平主应力差异大,差异系数0.27~0.34 | 地应力较大,50~80 MPa,最大水平主应力和最小水平主应力差异小,差异系数0.11~0.13 |
温压特征 | 地温梯度低,(2.1~2.5) ℃/100 m,地层压力系数<1.3 | 地温梯度高,(2.6~3.0) ℃/100 m,地层压力系数>1.3 |
生产特征 | 返排率高,日产液高,产量递减相对较慢 | 返排率低,日产液低,产量递减相对较快 |
Table 2
Shale pore types and characteristics"
孔隙类型 | 亚类 | 特征描述 | 成因 | |
---|---|---|---|---|
无机孔 | 粒间孔 | 颗粒间孔隙或矿物间的接触部分,一般为数百纳米及其以下 | 压实残余、溶蚀或收缩 | |
粒内孔 | 数纳米到数百纳米不等,包括颗粒内微孔及黏土矿物解理缝 | 溶蚀 | ||
晶间孔 | 矿物晶体间的孔隙,主要位于黏土矿物及黄铁矿物部分 | 结晶 | ||
有机孔 | 干酪 根孔 | 无定形干酪根孔 | 数纳米到数百纳米不等,圆度较高且密集分布的孔隙 | 降解、热演化作用 |
结构型干酪根孔 | 数纳米到数百纳米不等,孔隙保有母质原始结构 | 热演化作用、凝胶作用 | ||
沥青孔 | 固体沥青孔 | 数纳米到数百纳米不等,原生沥青保有母质原始结构,孔隙多为圆或次圆 | 降解、液态烃演化 | |
沥青球粒孔 | 数十纳米到数百纳米不等,孔隙为不规则棱角状 | 热演化作用、物理堆积 | ||
微裂缝 | 应力缝 | 宽度一般小于2 μm,长度几微米到数厘米不等,矿物颗粒或有机质颗粒不规则破裂 | 应力(构造及成岩) | |
收缩缝 | 宽度一般小于1 μm,长度不超过100 μm,多见于有机质与矿物颗粒接触面 | 脱水或收缩 |
Table 3
Classification and evaluation criteria for shale gas reservoirs"
储层 分级 | 微孔(<5 nm) | 小孔(5~25 nm) | 常压页岩储层 | 高压页岩储层 | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
孔容/(mL·g-1) | 孔隙度/% | 孔容/(mL·g-1) | 孔隙度/% | TOC/% | 实验测总含气量/(mL·g-1) | TOC/% | 实验测总含气量/(mL·g-1) | ||||
好储层 | >0.006 | >1.5 | >0.005 | >1.25 | >4.5 | >2.2 | >3.5 | >4.5 | |||
中储层 | >0.006 | >1.5 | >0.002 | >0.5 | 2.5~4.5 | >1.8 | 2.0~3.5 | >3.7 | |||
差储层 | 0.002~0.006 | 0.5~1.5 | 1.0~2.5 | <1.5 | 1.0~2.0 | <2.3 | |||||
非储层 | <0.002 | <0.5 | <1.0 | <1.0 |
Table 4
Standards for evaluation of normal pressure shale gas targets"
评价参数 | 一类区 | 二类区 | 三类区 | ||
---|---|---|---|---|---|
物质基础 | 关键 参数 | 优质页岩厚度/m | >30 | 20~30 | 15~20 |
有机质丰度/% | >3 | 2~3 | 1~2 | ||
优质页岩分布面积/km2 | >100 | 50~100 | <50 | ||
资源丰度/(108m3·km-2) | >8 | 4~8 | <4 | ||
辅助 参数 | 热演化程度/% | 2.0~3.0 | 3.0~3.5 | >3.5 | |
富集程度 | 关键 参数 | 地层压力系数 | >1.1 | 0.9~1.1 | <0.9 |
孔隙度/% | >4 | 2~4 | <2 | ||
含气量/(m3·t-1) | >4 | 2~4 | <2 | ||
辅助 参数 | 距剥蚀边界距离/km | >4 | 2~4 | <2 | |
断裂发育程度 | 断裂较少,规模小 | 断裂较发育,规模小 | 断裂发育,规模大 | ||
距开启断层距离/km | >1.5 | 0.5~1.5 | <0.5 | ||
孔径/nm | >10为主 | 2~10为主 | <2为主 | ||
比表面积/(m2·g-1) | >20 | 15~20 | <15 | ||
地 应 力 场 | 关键 参数 | 构造样式 | 背斜、斜坡、褶皱宽缓的向斜 | 较宽缓向斜 | 较紧闭—紧闭复杂褶皱 |
埋深/m | 1 500~3 800 | 1 000~1 500或3 800~4 500 | >4 500 | ||
层理缝 | 发育 | 较发育 | 不发育 | ||
微裂缝 | 发育 | 较发育 | 不发育 | ||
地应力/MPa | <80 | 80~95 | >95 | ||
应力差异系数 | <0.2 | 0.2~0.3 | >0.3 | ||
硅质含量/% | >50 | 30~50 | <30 | ||
曲率 | 中等 | 大 | 小 | ||
辅助 参数 | 泊松比 | <0.25 | 0.25~0.30 | >0.30 | |
黏土含量/% | <30 | 30~40 | >40 | ||
脆性指数/% | >50 | 30~50 | <30 | ||
顶底板 | 具应力隔挡 | 应力隔挡不明显 | 不具应力隔挡 |
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