Oil & Gas Geology ›› 2023, Vol. 44 ›› Issue (2): 480-494.doi: 10.11743/ogg20230218
• Methods and Technologies • Previous Articles Next Articles
Jinbu LI1,2(), Yuehua CUI1,2(), Yougen HUANG1,2, Shixiang FEI1,2
Received:
2022-07-25
Revised:
2022-12-23
Online:
2023-03-17
Published:
2023-03-17
Contact:
Yuehua CUI
E-mail:ljb2_cq@petrochina.com.cn;cyh168_cq@petrochina.com.cn
CLC Number:
Jinbu LI, Yuehua CUI, Yougen HUANG, Shixiang FEI. Technologies and prospect of full-cycle development of low-permeability tight gas reservoirs with horizontal wells, Ordos Basin[J]. Oil & Gas Geology, 2023, 44(2): 480-494.
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Table 1
Geological conditions and development characteristic parameters of different gas reservoirs, Ordos Basin"
天然气藏类型 | 碳酸盐岩气藏 | 低渗砂岩气藏 | 致密砂岩气藏 | |
---|---|---|---|---|
典型气田 | 靖边气田 | 榆林气田 | 苏里格气田 | |
埋深/m | 3 200 ~ 3 900 | 2 650 ~ 3 100 | 2 800 ~ 3 700 | |
沉积相 | 潮坪、台地 | 曲流河 | 曲流河、辫状河 | |
储层厚度/m | 5 ~ 15 | 5 ~ 32 | 40 ~ 60 | |
气层厚度/m | 4 ~ 10 | 3 ~ 17 | 3 ~ 15 | |
储集空间 | 溶孔、晶间孔、晶间溶孔 | 粒间孔、溶蚀孔 | 残余粒间孔、溶蚀孔、晶间孔 | |
孔隙度/% | 4.4 ~ 8.6 | 6.3 ~ 8.8 | 4.5 ~ 9.7 | |
平均渗透率/(10-3 μm2) | 2.63 | 4.85 | 0.73 | |
地层压力系数 | 0.80 ~ 0.96 | 0.85 ~ 0.98 | 0.78 ~ 0.95 | |
储量丰度/(108 m3·km-2) | 0.55 | 0.93 | 1.15 | |
直井日产气量/(104 m3) | 3.0 | 2.4 | 1.0 |
Table 2
Selecting criteria of target layers for horizontal wells in low-permeability tight sandstone gas reservoirs,Ordos Basin"
气田 | 区带类型 | 储层特征 | 储量 集中度/% | 砂岩有效 厚度/m | 主、次产层渗透率比值 | 水平井部署条件 |
---|---|---|---|---|---|---|
苏 里 格 气 田 | Ⅰ类富集区 | 块状砂体发育, 主力层明显 | 75.1 | 9.3 | 0.8 ~ 5.9 | 储量丰度0.85 × 108 m3/km2以上;盒8段储量集中度70 %以上;主次产层渗透率比值1 ~ 4;心滩、河道砂体为主;砂岩有效厚度4 m以上 |
Ⅱ类富集区 | 砂体多期叠置, 含气性好 | 71.4 | 8.3 | 1.2 ~ 4.8 | ||
致密区 | 叠置砂体较发育, 含气性差 | 45.5 | 7.4 | 0.7 ~ 14.0 | ||
含水区 | 砂体多期发育, 气-水关系复杂 | 55.2 | 7.1 | 0.5 ~ 6.8 | ||
神木气田 | — | 多薄层发育, 砂体规模有限 | 75.0 | 7.8 | 0.8 ~ 3.9 | 储量丰度0.57 × 108 m3/km2以上;太原组储量集中度75 %以上;主、次产层渗透率比值1 ~ 4;河道砂岩为主;砂岩有效厚度5 m以上 |
庆阳气田 | — | 埋藏深、厚度薄、 层系单一 | 86.2 | 5.6 | 1.2 ~ 6.8 | 储量丰度0.52 × 108 m3/km2以上;山1段储量集中度85 %以上;主、次产层渗透率比值1 ~ 4;河道砂体为主;砂岩有效厚度5 m以上 |
Table 4
Evaluation criteria and design parameters for stimulating sweet spots in tight sandstone gas reservoirs, Ordos Basin"
综合品质 | Ⅰ类储层 | Ⅱ类储层 | Ⅲ类储层 |
---|---|---|---|
地质甜点 | 气测 > 20 % | 10% ≤ 气测 ≤ 20 % | 气测 < 10 % |
GR ≤ 40 API | GR ≤ 60 API | GR ≤ 90 API | |
工程甜点 | σh > 30 MPa | 30 MPa ≤ σh ≤ 50 MPa | 50 MPa < σh |
布缝方式 | 多簇射孔,密集布缝 | 适度加密 | 少段多孔 |
段间距/m | 70 ~ 80 | 80 ~ 100 | 100 |
簇间距/m | 10 ~ 15 | 15 ~ 20 | ≥ 20 |
段砂量/m3 | 70 ~ 80 | 50 ~ 60 | 40 |
段液量/m3 | < 550 | < 450 | < 300 |
Table 5
Geological division and development indexes of tight sandstone gas reservoirs, Ordos Basin"
区带类型 | 地质储量/ (108 m3) | 主要地质特征 | 气层 厚度/m | 渗透率/ (10-3μm2) | 含气 饱和度/% | 内部 收益率/% |
---|---|---|---|---|---|---|
富集区 | 1.99 | 石英砂岩为主,砂体厚且连续性好,稳定发育 | 8.6 | 0.81 | 68.4 | 9.8 |
致密区 | 1.14 | 石英砂岩、岩屑石英砂岩为主,总体致密 | 7.4 | 0.63 | 57.4 | 7.6 |
多层系致密区 | 0.57 | 岩屑石英砂岩为主,单层产能低,优势层不突出 | 7.8 | 0.64 | 54.2 | 8.6 |
含水区 | 1.43 | 石英砂岩为主,气-水关系复杂,水/气比较高 | 7.1 | 0.72 | 52.6 | 4.4 |
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