THE FAULT SEALING ANALYSIS OF THE PUTAOHUA OIL LAYER IN THE GULONG OILFIELD
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摘要: 古龙油田断层极为发育，断层的封闭性对研究区油气的运聚起着重要的控制作用，研究断层封闭性有利于预测油气成藏的有利部位。从断层类型、几何特征和埋深对研究区断层封闭性开展地质定性分析，重点从断层两盘岩性对置、泥岩涂抹和应力对断层封闭性进行了定量分析，研究典型断层的封闭演化史。结果表明，古龙油田葡萄花油层一级断层和三级断层封闭性较好，二级断层封闭性一般；平面上鼻状构造断层封闭性好于向斜断层封闭性，其中龙南鼻状构造断层封闭性最好。Abstract: Faults in the Gulong oilfield are extremely developed. The fault sealing ability plays an important role in controlling the oil and gas migration and accumulation in the study area, so the study of fault sealing is in favor of the prediction of favorable locations for oil and gas accumulation. Qualitative analysis were carried out on the fault sealing ability in the study area from the aspects of fault type, geometric characteristics and buried depth, focusing on the two sides lithology configuration, clay smearing and stress. The sealing evolution history of typical faults was also studied. The results show that the primary and tertiary faults have good sealing ability, while the sealing ability of the secondary faults is ordinary. The fault sealing ability of the nose structure is superior to that of the syncline fault, in which the fault sealing ability of Longnan nose structure is the best.
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Key words:
- fault sealing ability /
- lithology configuration /
- clay smearing /
- the Gulong oilfield
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图 2 古龙油田葡萄花油层顶面立体图
Figure 2. The top space diagram of the Putaohua Oil Layer in the Gulong Oilfield
图 3 古龙油田葡萄花油层断层分布图
Figure 3. Faults distribution diagram of the Putaohua Oil Layer in the Gulong Oilfield
图 4 1号断层岩性配置关系图(平行于断面)
Figure 4. Two sides lithology configuration diagram of the fault 1 (Parallel to the section)
图 5 1号断层岩性对接封闭评价图(平行于断面)
Figure 5. Fault sealing evaluation diagram of the fault 1 according to two sides lithology configuration (Parallel to the section)
图 6 1号断层SSF封闭指数图(平行于断面)
Figure 6. SSF sealing index diagram of the fault 1 (Parallel to the section)
图 7 1号断层岩性与泥岩涂抹封闭评价图(平行于断面)
Figure 7. Fault sealing evaluation diagram of the fault 1 according to fault lithology and clay smearing (Parallel to the section)
图 8 1号断层封闭演化史(平行于断面)
Figure 8. Fault sealing evolution of the fault 1 (Parallel to the section)
图 9 古龙油田葡萄花油层有利区块预测图
Figure 9. Diagram of the predicted favorable blocks of the Putaohua Oil Layer in the Gulong Oilfield
表 1 古龙油田15条典型断层封闭性定性评价表
Table 1. Qualitative evaluation table of fault sealing ability in the Gulong Oilfield
级别 断层号 断层性质 倾角 断距/m 目的层埋深/m 主要活动期 综合评价封闭性 一级断层 1 正 41° 19 1400~1700 泉头组—姚家组姚一段 一般 10 正 37° 24 1915~1955 泉头组—姚家组姚一段 一般 16 正 39° 16 1630~1660 泉头组—姚家组 很好 25 正 43° 14 1750~1815 泉头组—青山口组 一般 40 正 37° 17 1105~1135 泉头组—青山口组 较好 二级断层 4 正 38° 24 1750~1820 泉头组—嫩江组嫩一段 较好 8 正 43° 13 1750~1805 泉头组—姚家组姚一段 较差 18 正 46° 28 1740~1765 青山口组—嫩江组嫩二段 较差 26 正 38° 19 1805~1820 泉头组—姚家组 一般 41 正 40° 25 1035~1105 泉头组—嫩江组嫩二段 一般 三级断层 2 正 39° 8 1700~1770 泉头组—姚家组姚一段 很好 9 正 42° 8 1827~1865 泉头组—姚家组 一般 23 正 40° 4 1765~1785 泉头组—青山口组 很好 27 正 40° 16 1785~1810 泉头组—姚家组姚一段 一般 37 正 41° 13 1300~1355 青山口组—嫩江组嫩二段 较好 
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表 2 古龙油田15条典型断层封闭性定量评价表
Table 2. Quantitative evaluation table of fault sealing ability in the Gulong Oilfield
级别 断层号 所属构造单元 岩性对置情况 泥岩涂抹因子SSF 应力/MPa 综合评价封闭性 一级断层 1 敖古拉—哈拉哈鼻状构造 较好 1.20 15.50~21.18 较好 10 他拉哈向斜 较差 2.03 16.28~22.45 一般 16 龙南鼻状构造 很好 1.12 14.80~20.91 很好 25 常家围子向斜 较差 2.15 16.44~22.82 较差 40 高西鼻状构造 较好 1.23 14.32~19.73 较好 二级断层 4 敖古拉—哈拉哈鼻状构造 一般 1.48 15.74~20.36 一般 8 他拉哈向斜 较差 2.10 16.48~22.83 较差 18 龙南鼻状构造 较好 1.07 14.16~19.87 较好 26 常家围子向斜 较差 4.11 16.24~21.91 较差 41 高西鼻状构造 一般 1.26 14.42~19.16 较好 三级断层 2 敖古拉—哈拉哈鼻状构造 很好 1.09 15.65~20.14 很好 9 他拉哈向斜 较差 2.56 16.28~21.94 较差 23 龙南鼻状构造 很好 1.14 14.76~20.33 很好 27 常家围子向斜 较差 1.93 16.19~21.82 一般 37 高西鼻状构造 很好 1.17 13.60~20.25 很好
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