逆冲断裂断层侧向封闭性评价——以柴达木盆地英东一号油气田为例

Evaluation on lateral fault sealing capacity in thrust fault: taking No.1 Yingdong Oilfield,Qaidam Basin as an example

 孟庆洋 2 贾茹³ 陈琰⁴ 袁莉⁴ 杨帆² 张静⁴

中国石油天然气集团公司盆地构造与油气成藏重点实验室，北京 100083 中国石油勘探开发研究院，北京 100083 东北石油大学，黑龙江 大庆 163318 中国石油青海油田分公司勘探开发研究院，甘肃 敦煌 736202)

 英东一号油气田是一个受多条逆断裂控制的高丰度油气藏，通过对断裂带内部结构和控藏机理的综合分析，认为断裂带内部的泥质体积分数直接影响了断层对油气的封闭能力。因此，文中选取SGR法对断层的侧向封闭性进行了评价。通过SGR对断层圈闭内的烃类与断裂带中所含的水之间的压力差进行标定，利用TrapTester软件模拟出SGR与临界压力关系式，并计算出英东一号构造B断块和C断块所能封闭的烃柱高度范围分别是137~359 m和85~302 m ，说明了控藏断裂具有良好的封闭性。

No.1 Yingdong Oilfield is a highly abundant reservoir controlled by multiple thrust faults. After synthetic analysis on the internal structure of fault zone and controlling hydrocarbon accumulation mechanism, it is concluded that the shale content in fault zone has a direct impact on the sealing capacity of thrust faults. In this paper, the SGR method is adopted to evaluate the lateral sealing capacity of the thrust faults. Using SGR to calibrate the pressure difference between the hydrocarbon and water in fault trap, the formula of SGR and critical pressure can be simulated by TrapTester software. Then the maximum hydrocarbon column height sealed in other sections of block B and block C can be calculated. The sealed hydrocarbon column height is between 137-359 m in block B and 85-302 m in block C, which demonstrates that the lateral sealing capacity of thrust faults is good.

10.6056/dkyqt201602002