渤中凹陷西北缘古近系构造活动对储层的控制

针对渤中凹陷西北缘古近系构造活动与储层之间的关系模糊等问题，利用钻井、测井、三维地震、分析化验等资料，运用断层活动速率法，定量分析了渤中凹陷西北缘古近系构造活动特征，结合沉降速率和储层分布、物性特征，探讨了构造活动对储层的控制作用。研究表明，断层活动在古近纪东三期最强，沙三期和东二期次之，沙一二期较弱，东一期最弱；同一时期不同位置的断层活动具有差异性。沙三期、东三期断层活动强，沉降中心离边界断层较近，主要发育扇三角洲，厚度大，粒度粗，延伸距离短；沙一二期断层活动弱，沉降中心离边界断层相对较远，发育辫状河三角洲，厚度大，粒度粗，但延伸距离远；东二期断层活动强，而晚期受边界断层的影响减弱，且受外物源的影响，发育辫状河三角洲，厚度小，粒度细，延伸距离更远；东一期断层活动极弱，发育辫状河三角洲，厚度小，延伸距离远。边界断层活动控制着碎屑沉积物进入湖盆的位置，次生断层活动对碎屑沉积物的展布具有调节作用。东三末期区域性构造抬升作用对扇三角洲致密储层物性具有明显的改善作用。该规律能够对低勘探程度区类似陡坡带的储层预测提供参考。

Control of Paleogene Reservoir by Tectonic Activity in North-western Margin of Bozhong Sag

This study provides a quantitative analysis of features associated with tectonic activity in the north-western margin of the Bozhong Sag, with the aim of clarifying the relationship between reservoirs and tectonic activity. Using data from drilling, logging, three-dimensional seismic survey, and laboratory analysis, with related materials and the fault activity rate, the control of tectonic activity over the reservoir with respect to settlement rate, reservoir distribution, and physical characteristics is determined. The results show that, for the same period, fault activity varied in different locations. Es3 and Ed3 were characterized by strong fault activity, corresponding to a period of strong fault basin subsidence, and as the distance between settlement center and the boundary faults was short, they mainly developed into fan deltas with thick and coarse granularity. Es1 and Es2 had weak fault activity, corresponding to a weak rift basin, and as the distance between the boundary faults and subsidence center was relatively great, they mainly developed into braided river deltas with thick and coarse granularity. Ed2 had strong fault activity, corresponding to the transition stage, was less affected by the late boundary fault and more by distant provenance, and developed into braided river deltas with fine granularity, low thickness, and greater extension. Ed1 was characterized by very weak fault activity, and developed into braided river deltas with low thickness and long extension, mainly regulated by secondary fault activity. Border faulting controls the location of clastic sediment input to the basin, while secondary fault activity plays a regulatory role in the spread of clastic sediments. Regional tectonic uplift significantly improves the fan delta tight reservoir. This finding provides a reference for reservoir prediction in areas of low exploration with a similar tectonic setting.