辽河坳陷欧利坨子地区构造成因及石油地质意义

摘要/Abstract

摘要： 欧利坨子地区是辽河油田稀油年产500×104t的重要资源接替区，石油地质储量近3000×104t。通过对新采集处理的三维地震资料以及钻井、测井资料进行解释和构造发育史研究，分析了欧利坨子地区新生界古近系的构造特征及成因，并探讨了其对油气运移、成藏的控制作用，指出了下一步有利勘探目标。研究认为：①古近纪为欧利坨子地区构造格局的定型期，其构造演化先后经历了拱张、裂陷、衰减、再陷4个阶段，主要构造运动为沙三段沉积时期的伸展运动和东营组沉积时期的走滑运动；②研究区现今构造格局是伸展构造体系与走滑构造体系叠加而形成的，南、北构造差异演化是正、逆断层相间的特殊花状构造的形成原因并导致了同一条断层性质发生正逆转换；③主干断层在油气运移时期表现为封闭性，起遮挡作用，不利于油气的二次运移；④剧烈的构造运动在很大程度上改善了储层物性；⑤花状构造高部位、依附于主干断层的断鼻等是油气聚集的最有利区域，西部超覆带发育地层油气藏。

关键词: 辽河坳陷, 欧利坨子, 构造叠加, 走滑断层, 花状构造, 油气勘探

Abstract: The Oulituozi area, an important resource replacement area for an annual light oil production of 500?04 t in the Liaohe oilfield, contains original oil in place (OOIP) of 3000?04 t. By the interpretation of newly acquired and processed 3D seismic data and drilling/logging data and the study of structural development history, the structural characteristics and genesis of the Cenozoic Paleogene formations in the Oulituozi area were analyzed, and their controlling effects on oil and gas migration and accumulation were investigated, in order to identify the favorable targets for future exploration. Following conclusions are drawn based on the study. First, the structural framework of the Oulituozi area was shaped in the Paleogene, when it sequentially evolved through four stages, i.e. arching, rifting, attenuating, and re-rifting, and underwent two major structural movements, i.e. extensional movement in the third member of Shahejie Formation (Es3) and strike-slip movement in the Dongying Formation (Ed). Second, the present structural framework in the study area is the superposition of the extensional system and the strike-slip system, and the structural evolution difference between the north and the south led to the unique flower structure with alternate normal and reverse faults and also the conversion of fault property. Third, major fault demonstrated a sealing performance during the oil and gas migration, and its barrier effect was unfavorable to the secondary migration of oil and gas. Fourth, intense structural movements significantly improved the reservoir physical properties. Fifth, the structural high in the flower structure and the fault-nose attached to the major fault are the most favorable zones for oil and gas accumulation, and stratigraphic oil reservoirs are developed within the overlap zones in the west.

Key words: Liaohe depression, Oulituozi, structural superposition, strike-slip fault, flower structure, oil and gas exploration

董文波, 李雅楠. 辽河坳陷欧利坨子地区构造成因及石油地质意义[J]. 中国石油勘探, 2016, 21(6): 65-72.

Dong Wenbo, Li Yanan. Structural genesis and its petroleum geological significance of Oulituozi area in Liaohe depression[J]. China Petroleum Exploration, 2016, 21(6): 65-72.

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