渤海PL油田花岗岩潜山储层发育特征及控制因素

PL油田为渤海最大潜山油田,发育孔缝型花岗岩储层,储层特征、分布规律及其控制因素复杂。综合岩矿和测井资料,分析了花岗岩储层的岩性特征、储集空间类型及物性特征。据孔缝发育程度和风化强弱,将花岗岩潜山纵向上分为极强风化带、强风化带、次风化带和弱风化带。对比研究多种地震属性与实钻储层发现,最大波谷振幅属性与储层之间具有良好的线性相关关系,据此预测了储层的平面展布。在此基础上,对岩性、构造应力、古地貌等因素对于该油田潜山储层发育的控制作用进行了机理分析。该研究为后期开发寻找优质储层奠定了基础,对同类型潜山油藏的勘探开发具有指导意义。

CHARACTERISTICS AND CONTROLLING FACTORS OF GRANITIC BURIED-HILL RESERVOIR IN PL OILFIELD OF BOHAI SEA

As the largest buried-hill oilfield in the Bohai Sea,the PL oilfield is characterized by its porous fractured granitic reservoir. Using the lithological and logging data from wells,the lithology,spatial distribution pattern and physical properties of the reservoir are carefully studied. According to its density and weathering intensity,the reservoir may be divided into several zones,namely,the very strong-weathered,strong-weathered,sub-weathered and weakly-weathered zones in a vertical direction. Comparison of various seismic attributes and drilling records indicates that there exists a high linear relationship between the maximum trough amplitude attribute and the reservoirs,upon which the reservoir spatial distribution were predicted. Furthermore,we discussed the influence factors based upon lithology,tectonic stress,geomorphology and other factors on the evolution of buried hill reservoirs. The study lays the foundation for searching high quality reservoirs and provides a clue for exploration of similar buried hill reservoirs.