浓江凹陷经历了多期构造运动,新生代构造特征、演化及其与油气的关系尚不清楚.通过对地质录井、物探测井、地震资料进行综合分析,剖析了浓江凹陷新生代断裂特征及其活动性,利用平衡剖面法分析了凹陷构造演化史,探讨了构造演化对油气条件形成及运聚的影响.研究结果表明,浓江凹陷断裂走向以北东向为主,发育张性构造和扭性构造.在达连河组沉积时期为初始断陷期,凹陷具有双断结构.宝泉岭组沉积时期为强烈断陷期,东部洼陷发育规模明显大于西部洼陷,具有南沉北翘的特点.宝泉岭组沉积末期,凹陷经历了复杂断坳转换,地层抬升遭受剥蚀,西部洼陷带削截现象明显,富锦组沉积时期以坳陷沉积作用为主,沉积末期为挤压反转期,东部洼陷带发生挤压反转,地层上拱遭受明显剥蚀.道台桥组沉积开始,凹陷进入稳定沉降期.研究区构造演化与油气关系密切,构造活动控制着烃源岩的分布、圈闭类型及展布以及油气的运聚成藏.%The Nongjiang depression in Sanjiang Basin has experienced multi-stage tectonic movements; its Cenozoic structural fea-tures,evolution and relation with oil and gas are still not clear.Through synthetically analyzed mud logging,well logging and seismic data,anatomized Cenozoic faulting features and activity; analyzed depression structural evolution history through equilibrium profile method;discussed structural evolution impact on oil and gas formation and migration.The results have shown that the orientation of faults in depression is mainly NE,developed tensional and torsional structures.The Dalianhe Formation sedimentation time was the ini-tial rift faulting stage;the depression has dual-fault structure.The Baoquanling sedimentation time was the strong rift faulting stage, the development scope of depression eastern part was obviously larger than depression western part with features of south down-warping and north up-warping.During the end of Baoquanling Formation sedimentation,the depression experienced complex faulting-depres-sion converted tectonic actions,strata lifted and denuded;cutting phenomenon in depression western part is obvious.The Fujin Forma-tion sedimentation time had mainly depression deposition,during the end stage compression reversal,strata up-warping and obviously denuded.Starting from the Daotaiqiao Formation sedimentation,depression entered a steady subsidence period.The structural evolu-tion has close relation with oil and gas formation,tectonic actions controlled source rock distribution,trap types and spreading,as well as oil and gas migration and reservoiring.
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