杏北油田葡萄花油层同生断层特征及控砂模式

CHARACTERISTICS OF CONTEMPORANEOUS FAULT AND SAND CONTROLLED MODEL BY FAULT FOR PUTAOHUA OIL RESERVOIRS IN XINGBEI OILFIELD

杏北油田断层十分发育，同生断层对砂体控制作用明显，认清断层与砂体分布的关系十分重要。以大庆杏北油田葡萄花油层为例，分析同生断层的生长特点，找出同生断层对砂体的控制作用，为最大限度地挖潜老油田剩余油提供有利证据。研究发现葡萄花油层部分断层为同生断层，同生断层活动时期主要为青山口组沉积时期、姚家组一嫩一二段沉积时期及嫩三四段沉积以后，断层强活动时期位于葡13单元沉积时期。同生断层在纵向上表现为断裂活动多期，横向上表现为断裂活动多段（分段生长）的特点。最终将断层特征与砂体分布相结合，阐明了同生断层对砂体分布的控制作用，总结出同生断层下降盘控砂和分段生长点控砂2种控砂模式。

Faults are well-developed in Xingbei Oilfield, the control of contemporaneous faults on the sand bodies is obvious, so it is very important to get a clear understanding of relation between the faults and sandbody distribution. Taking Putaohua reservoir of the oilfield as an example, the growth characteristics of the contemporaneous faults are analyzed to try to figure out their controlling action on the sandbodies. Thus these achievements can give favorable evidences for maximally tapping remained oil in the old field. The studies find that partial faults in Putaohua reservoir are growth fault. These growth faults was active during the deposition of Qingshankou Formation, from Yaojia Formation to Nenjing Member I - I1 and after the deposition period of Nenjing Member m-IV. The strong activity was conducted during the deposition of Pu I 3 Unit. Finally, with the help of integrating fault features and sandbody distribution, the controlling action of these contemporaneous faults on the distribution is clarified, and furthermore two modes of sand control including the sand control by the thrown wall of the contemporaneous faults and the sand control by the fault segmentations are summarized.