摘要
东辛浅层主要有平行状断块、环状-放射状断块、羽状断块、帚状断块四种断块模式。断层的输导性主要受断层级别、断层活动的周期性以及断层产状的控制。二、三级断层向下多断至沙三段烃源岩,向上可断至东营、馆陶组、明化镇组,为主要的控油断层;断层活动周期性控制油气垂向周期性运移;东辛浅层断面形态有同向断层、反向断层、地堑状、地垒状和“Y”型断层。断层的封闭性主要受断层性质、落差大小、断面形态及断层两盘地层接触关系、断面能否形成较大排替压力的低渗带等多种因素控制。可以根据断裂充填物、断移地层的砂泥比值、断层面倾角陡缓、是否存在孔隙流体超压、压力系数的垂向变化、断移地层内垂向地温梯度的变化以及泥岩涂抹分析来综合判断断层的封闭性。
There are four kinds of fault block models in Dongxin shallow layer, ie. parallel, circular - radial, pinnate, and fastigiate fault block. The migration performance of faults is affected by fault level, cycle of fault activity, and fault attitude. The second and third class faults linking shallow layer with source rock controls the migration of oil and gas. The periodic activity of fault controls the periodic vertical migration of petroleum along the fault. There are five kinds of fault attitude, ie. synthetic, antithetic, graben, horst, and 'y' type fault attitude. The sealing performance of fault is affected by fault nature, fault displacement, fault attitude, the contact between hanging wall and foot wall, etc. The sealing performance of fault can be judged by fillings in fault zone, the sand-mud ratio of the fractured layer, the dip of the fractured surface, pore fluid pressure, the vertical variance of pressure coefficient and geothermal gradient, etc.
出处
《西南石油学院学报》
CSCD
北大核心
2006年第2期27-31,共5页
Journal of Southwest Petroleum Institute
关键词
东辛浅层
断层
输导
封闭
成藏
Dongxin shallow layer
fault
migrate
seal
petroleum accumulation