Oil & Gas Geology ›› 2024, Vol. 45 ›› Issue (2): 357-366.doi: 10.11743/ogg20240204
• Petroleum Geology • Previous Articles
Debin YANG1(), Xinbian LU1, Dian BAO1, Fei CAO1, Yan WANG1, Ming WANG1, Runcheng XIE2
Received:
2023-10-31
Revised:
2024-03-25
Online:
2024-04-01
Published:
2024-04-30
CLC Number:
Debin YANG, Xinbian LU, Dian BAO, Fei CAO, Yan WANG, Ming WANG, Runcheng XIE. New insights into the genetic types and characteristics of the Ordovician marine fault-karst carbonate reservoirs in the northern Tarim Basin[J]. Oil & Gas Geology, 2024, 45(2): 357-366.
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Table 1
Comparison of structural characteristics of fault-karst reservoirs under different geological settings"
成因类型 | 结构特征 | 断裂特征 | 岩溶作用 | 储集空间组合 | 开发特征 | 分布区及实例 |
---|---|---|---|---|---|---|
过溶蚀 残留型 | 具层控状的洞穴+孔洞带+裂缝带 | 北东向主干断裂间加持北西向的平行次级断裂 | 暴露于地表的大气淡水岩溶作用为主 | 沿不整合面发育以洞穴、溶蚀孔洞为主及沿断裂带发育的溶蚀孔洞 | 油井普遍初期产能高、稳产能力强、累产高,井间面状连通 | 塔河油田剥蚀区,如塔河4区、6区、7区等 |
破碎+强溶蚀型 | 裂缝带+孔洞带+洞穴+孔洞带+裂缝带 | 北北西、北北东向的棋盘格式共轭剪切走滑断裂 | 地层条件下大气淡水的溶蚀作用为主 | 沿主干断裂发育大型洞穴、溶蚀孔洞以及溶蚀的裂缝带 | 油井普遍初期产能高、稳产能力较强、累产较高,井间线状连通 | 塔河油田覆盖区,如TP12CX等断裂带 |
强破碎+弱溶蚀型 | 破碎带+孔洞(含局部发育的洞穴)+破碎带 | 北东向、近南北向的平行走滑断裂 | 埋藏条件的多种溶蚀作用 | 沿主干断裂发育大规模的破碎作用,以断面空腔+角砾间孔隙+裂缝为主 | 油井普遍初期产能高、稳产能力偏弱、累产较高,井间连通弱 | 顺北地区,如顺北1号、5号走滑断裂带 |
Table 3
Fault and other characteristics of the three types of fault-karst reservoirs in the Tabei area"
成因类型 | 断溶体油藏 | 断裂特征 | 油藏特征 | ||||||
---|---|---|---|---|---|---|---|---|---|
长度/km | 破碎带宽度/km | 破碎带深度/km | 溶洞钻遇率/% | 溶洞高度/m | 油柱高度/m | 初期产能/(t/d) | 累产/(104 t) | ||
过溶蚀残留型 | TP101 | 11.6 | 0.24~2.3 | 1.5~1.8 | 38.1 | 3.3 | 96.0 | 108.0 | 31.9 |
破碎+强溶蚀型 | TP249X | 6.8 | 0.1~0.3 | 1.5~1.8 | 16.7 | 3.0 | 105.0 | 48.0 | 8.6 |
强破碎+ 弱溶蚀型 | TP12CX | 7.8 | 0.3~2.4 | 1.5~1.8 | 46.7 | 4.9 | 93.0 | 164.0 | 6.4 |
TP315 | 8.3 | 0.2~1.6 | 0.9~1.2 | 21.4 | 2.7 | 81.0 | 71.8 | 12.9 | |
TP310 | 10.5 | 0.1~0.8 | 0.9~1.2 | 10.0 | 1.2 | 110.0 | 66.0 | 22.1 |
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