南堡凹陷老爷庙地区断裂构造与油气成藏

Fault Tectonics and Petroleum Entrapment in the Laoyemiao Region of the Nanpu Depression

陈玮常 闫晶晶 孙冠宇 杨荣超 周微

CHEN Weichang YAN Jingjing SUN Guanyu YANG Rongchao ZHOU Wei

中国石油冀东油田分公司, 河北 唐山 063000

Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063000, China

为阐明南堡凹陷老爷庙地区断裂构造特征及其对油气成藏的控制作用，运用构造解析原理对断裂演化与油气成藏要素耦合性进行深入分析。研究认为，老爷庙地区断裂系统分为基底断裂和盖层断裂两大类，垂向发育的火成岩是深、浅两套断裂系统的韧性传递带。始新世正向伸展断陷形成的NNE、NE向基底断裂系统呈多期铲式扇样式；渐新世斜向伸展断陷形成的NEE走向的盖层断裂系统，以地垒-地堑和多米诺样式为主；新近纪，在热沉降背景下受深部断裂走滑变形影响，盖层中沿主干断层发育花状和复"Y"字样式。老爷庙地区主干断层的多期断陷作用利于烃源岩的沉积和成熟，也是油气埀向运移的主要通道；背斜主体带和侧斜坡带是有利成藏区。

To elucidate the tectonic characteristics of faults in the Laoyemiao region of the Nanpu Depression and their role in the control of petroleum entrapment, the principles of tectonic analysis were used to perform an in-depth analysis of the coupling between petroleum entrapment factors and the evolution of faults. It was found in this study that fault systems in the Laoyemiao region may be broadly divided into basement and superficial faults, and the vertically developed igneous rocks constitute the ductile transfer zone of deep and shallow fault systems. The NNE and NE striking basement faults formed by forwards-extending Eocene rifts were present as multi-periodic listric fan faults, while the NEE-striking superficial fault systems formed by obliquely extended Oligocene rifts mainly occurred as horst and graben faults, and domino faults. In the Neogene layer, flower-and Y-shaped styles of deformation formed along the main fault line in the cap rocks due to the sliding deformation of deep faults, in the midst of thermal precipitation. The multi-periodic rifting of the main fault line in the Laoyemiao region was favorable for the sedimentation and maturation of source rocks, and the main fault line was also the primary channel for the vertical migration of petroleum within this region. Hence, anticlines and sloped zones are favorable areas for hydrocarbon accumulation.

10.11885/j.issn.1674-5086.2016.11.04.02