高邮凹陷真武—吴堡断裂带断层封闭性综合评价

Comprehensive evaluation on fault sealing in Zhenwu-Wubao fault zone of Gaoyou Sag

尹志军¹ 谭建财¹ 娄国泉² 滕长宇¹ 仲学哲³

中国石油大学（北京）油气资源与探测国家重点实验室，北京 102249 中国石化江苏油田分公司物探技术研究院，江苏 南京 210046 中国石油冀东油田公司，河北 唐山 063200

State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China Geophysical Research Institute of Jiangsu Oilfield Company, SINOPEC, Nanjing 210046, China Jidong Oilfield Company, PetroChina, Tangshan 063200, China

高邮凹陷是苏北盆地勘探程度最高、含油潜力最大的凹陷。为揭示断层作为油气垂向运移通道与侧向遮挡在油气成藏与分布规律中起到的关键作用，文中应用岩性对置和泥岩涂抹2种方法对断层封闭特征进行了综合研究。结果表明，在区域盖层较厚、断层断距较大的情况下，岩性对置是影响高邮断层封堵性的关键因素；在断层两侧岩性对置封堵较差的情况下，泥岩涂抹直接决定了断层的侧向封堵性。定量计算表明，断层泥比率（SGR）大于0.65，断层具有封堵性，并且断层封堵性与SGR值的大小成正比。

Gaoyou Sag is the area with the highest degree exploration and the greatest oil potential in Subei Basin. In order to reveal the key role of fault acting as vertical migration pathway or lateral sealing in hydrocarbon accumulation and distribution,the characteristics of fault sealing were comprehensively analyzed with the methods of lithology juxtaposition and shale smear in this paper. Result shows that lithology juxtaposition is the critical factor of fault sealing in the case of thick regional cap rock and large fault throw available. But when lithology juxtaposition does not match excellently, shale smear directly decides the fault lateral sealing. The quantitative estimation shows that the lower limit of shale gouge ratio (SGR) is more than 0.65 and fault has sealing capability which is in proportion to SGR.

10.6056/dkyqt201201007