八面河老河口地区构造演化研究及潜力分析  

Study on Tectonic Evolution and Potential Analysis in Laohekou Area of Bamianhe

作　　者：蔡炳坤[1] CAI Bingkun(Geophysical Research Institute of Jianghan Oilfield Company,SINOPEC,Wuhan,Hubei,430035,China)

机构地区：[1]中石化江汉油田分公司物探研究院,湖北武汉430035

出　　处：《江汉石油职工大学学报》2020年第6期8-11,共4页Journal of Jianghan Petroleum University of Staff and Workers

摘　　要：老河口洼陷形成于早第三纪喜山旋回的右旋拉张期,为"北断南超、北深南浅"的箕状结构;构造演化主要经历了印支-燕山-喜山三期运动,印支期褶皱隆升,形成北西向逆断层,燕山期北西向断裂负反转,形成中古生界潜山雏形和区域上东西分带特征,喜山期发育近东西向断层,形成大量局部构造;该区东营运动末期整体抬升遭受严重剥蚀,西侧羊角沟凸起和北部潍北凸起馆陶组直接与古生界接触,凸起定形时间早于区域油气运移高峰期,不利于八面河油区及青东凹陷油气运移到本区,区内钻探的羊斜8井揭示了该区沙四段烃源岩具有生烃潜力,且该区中、古生界保存完整,其沉积的煤系地层及海相烃源岩可作为该区油源条件,综合评价认为老河口洼陷存在自生自储油藏潜力。Laohekou depression was formed in the dextral extensional period of the Himalayan cycle in the early Tertiary,presenting a dustpan-like structure of "fault at the north,overlap at the south,deep at the north and shallow at the south".The tectonic evolution mainly experienced the Indosinian-Yanshan-Himalayan movement,with the Indosinian fold uplift forming the north-west thrust fault,the negative inversion of the Yanshanian North-west fault forming the rudimental Middle Paleozoic buried hill and featuring the east-west zoning on the region,and with the near east-west fault developed in the Himalayan period,forming a large number of local structures.At the end of Dongying movement,the whole uplift was subjected to severe denudation,the west Yangjaogou uplift and the Guantao Formation of the northern Weibei uplift were in direct contact with the Paleozoic,and the shaping time of the uplift was earlier than the peak period of the regional oil and gas migration,which was disadvantageous to the migration of oil and gas to the Bamianhe area and the Qingdong depression.Well Yangxie-8 drilled in the area reveals that its source rock of Sha-4 member has hydrocarbon generation potential,and the Mesozoic and Paleozoic strata are well preserved in the area.The coal strata and marine source rock deposited in the area can be used as the source conditions.The comprehensive evaluation shows that the Laohekou depression has the potential of self-generation and self-accumulation reservoirs.

关 键 词：老河口 构造演化 自生自储 

分 类 号：P618.1[天文地球—矿床学]