渤中凹陷西北缘古近系构造活动对储层的控制

发布时间：2018-08-06 09:29

【摘要】：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。
[Abstract]:In view of the fuzzy relationship between Paleogene tectonic activity and reservoir in the northwest margin of Bozhong Sag, using drilling, logging, 3D seismic and laboratory data, the fault activity rate method is used. The characteristics of Paleogene tectonic activity in northwestern margin of Bozhong sag are quantitatively analyzed. Combined with subsidence rate, reservoir distribution and physical properties, the controlling effect of tectonic activity on reservoir is discussed. The results show that the fault activity is the strongest in the third phase of Paleogene, followed by the third phase of Sha 3 and the second phase of East, the weaker stage 1 and 2 of Sha, and the weakest phase of phase East, and the fault activity in different positions in the same period is different. In the third stage of Sha, the activity of the fault is strong, the subsidence center is close to the boundary fault, the fan delta is mainly developed, the thickness is large, the grain size is coarse, the extension distance is short, the fault activity of the first and second stage of the sand is weak, and the subsidence center is relatively far from the boundary fault. The braided river delta is developed with large thickness and coarse granularity, but with a long extension distance. The East II fault is strongly active, while the late stage is affected by the boundary fault, which is influenced by the external provenance. The braided river delta is developed with small thickness and fine grain size. The fault activity is very weak and the braided river delta is developed in the first stage of the east, the thickness is small and the extension distance is long. The boundary fault activity controls the position of clastic sediments entering the lake basin, and the secondary fault activity regulates the distribution of clastic sediments. The regional tectonic uplift at the end of the third stage of East China has a significant effect on the physical properties of fan delta tight reservoirs. This rule can be used as a reference for reservoir prediction in low exploration area similar to steep slope zone.
【作者单位】：中海石油(中国)有限公司天津分公司渤海石油研究院;
【基金】：国家科技重大专项(2011ZX05023-001-004)
【分类号】：P618.13

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