河北南堡凹陷老爷庙油田构造活动与油气富集

TECTONIC ACTIVITY AND PETROLEUM ENRICHMENT IN THE LAOYEMIAO OILFIELD IN THE NANPU DEPRESSION IN HEBEI

河北南堡凹陷老爷庙油田的构造活动主要表现为 3个方面 :(1)东营组时期同沉积断陷活动强烈 ,形成了庙北滚动背斜和庙南斜坡的两个构造单元 ;(2 )东营组一段和明化镇组时期 ,走滑作用加剧了断层发育 ,形成了平面上雁行状排列、剖面上似花状组合的断裂系统 ;(3)明化镇组晚期反转构造形成了众多的小背斜。研究区上、下第三系两套断裂系统贯通性良好 ;多幕式构造活动使断层开启与封闭交替进行 ;明化镇组时期断裂的强烈活动与主排烃期一致 ;反转挤压限止了油气的漏失。因此 ,构造活动不仅产生了丰富多样的圈闭构造 ,提供了有利的油气运移通道和保存条件 ,而且直接导致了研究区多层系高产油藏的形成。

The tectonic activities in the Laoyemiao oilfield of the Nanpu depression displays mainly three aspects. Firstly, the violent acting synsedimentary faults formed two tectonic units consisted of a rolling anticline in the north of the Laoyemiao oilfield and a slope in the south of the Laoyemiao oilfield during Dongying Formation developing; Secondly, the strike slip movement enforced faults growing, and produced fault systems with a echelon arrangement on plain and flower liking on profile during the period of the first member, the Dongying Formation and Minghuazhen Formation developing. Thirdly, the reverse tectonic activities produced numerous small anticlines during the late period of the Minghuazhen Formation developing. The two fault systems distributed separately in the Upper Tertiary and in the Lower Tertiary are well communicating; The episodic tectonic activity made faults open and close alternatively; The time of violent tectonic action during the period of the Minghuazhen Formation developing accorded with the time of main hydrocarbon ejection; The reverse extruding inhabited petroleum percolating. In a word, the tectonic activity not only produced abundant the traps and provided favorable petroleum migration passages and conserve condition but also led to the multizone and high capacity pool in the Laoyemiao oilfield.