大庆长垣中部中浅层多期复杂断裂特征  

The characteristics of multi-stage complex faults of middle-shallow layers in the central Daqing placanticline

作　　者：万双双[1] 马永 李忠权[1,2] 王佳佳 陈均亮[3] 李洪奎[1] WAN Shuangshuang;MA Yong;LI Zhongquan;WANG Jiajia;CHEN Junliang;LI Hongkui(College of Earth and Planetary Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan610059,China;Research Institute of Petroleum Exploration and Development,Daqing Oilfield Company Limited,Daqing,Heilongjiang 163712,China)

机构地区：[1]成都理工大学地球与行星科学学院,四川成都610059 [2]油气藏地质及开发工程全国重点实验室成都理工大学,四川成都610059 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《矿物岩石》2024年第4期96-110,共15页Mineralogy and Petrology

基　　金：国家自然科学基金项目(批准号:41672196);国家级重点研发计划项目子课题(编号:2021YFB2300906-01);国家科技重大专项项目(批准号:2017ZX05008001);自然资源部构造成矿成藏重点实验室开放基金项目(编号:gzck2012010)。

摘　　要：松辽盆地断穿T_(2)反射界面的断裂是影响扶余油层成藏的重要因素之一,明确中浅层多期复杂断裂的展布特征和活动性对扶余油层油气勘探具有重要的指导意义。本次研究以大庆长垣中部中浅层断裂为研究对象,在三维地震解释基础上,通过断层穿层性分析、生长指数法、古落差法等对断裂的活动性进行了定性和定量分析,并结合断层相关褶皱和古构造应力场分析确定了反转期活动断裂。结果表明:(1)大庆长垣中部断穿扶余油层顶界的中浅层断裂复杂多样,均表现为陡倾的正断层,以平面延伸长度为0.5~2.0km的小断层和走向为NW和NNW向的断裂为主,呈密集带状展布;(2)研究区断裂活动频繁,在坳陷期青山口组沉积时和反转期明水组沉积末期,断裂活动相对较强烈;(3)断裂密集带边部断层规模相对较大,普遍存在多期继承性活动特征,且多数在反转期发生了明显活动;(4)不同走向的断层在反转期不同阶段断裂活动性质不一致,在明水组沉积末期,NW和NNW走向的断裂以张性为主,而NE向和近SN向断裂以压性和压扭性为主。_The faults truncating the T_(2)reflection interface in the Songliao basin play a pivotal role in in-fluencing hydrocarbon accumulation within the Fuyu oil formation.Understanding the distribution and ac-tivity characteristics aof the complex,multi-stage faults in the middle and shallow layers of the Fuyu oil formation is essential for oil and gas exploration and development.This paper focuses on faults in the mid-dle and shallow layers in the central area of the Daqing placanticline.Based on 3D seismic interpretation,both qualitative and quantitative analyses of fault activity are conducted using the analysis of the fault's lay-er-truncating properties,the growth index method,and the paleo-downthrow method.Reactivated faults during the inversion period were identified through an examination of fault-related folds and the ancient tectonic stress field.Key findings include:(1)The middle and shallow-layer faults that intersect the top boundary of the Fuyu oil formation in the central Daqing placanticline exhibit significant complexity and variability.Most faults trend NW and NNW,with steep dips,horizontal displacements ranging from 0.5 to 2 km,with a dense zonal distribution.(2)Fault activity in the study area was frequent and intense,par-ticularly during the deposition of the Qingshankou formation in the sag phase and at the end of the Ming-water formation deposition during the inversion phase.(3)Faults located at the edges of densely faulted zones are typically larger and often exhibit multiple stages of inherited activity,with significant reactiva-tion during the inversion period.(4)Fault activity varied by orientation during different stages of the in-version period.At the end of the Mingwater formation deposition,NW-and NNW-trending faults primari-ly exhibited extensional behavior,while NE and near-SN-trending faults were predominantly compression-al or compressive-shear in nature.

关 键 词：大庆长垣 扶余油层 反转期活动断裂 断裂密集带 致密砂岩 

分 类 号：P542.3[天文地球—构造地质学]