渤海湾盆地南堡35-2油田地质特征与开发潜力再认识
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摘要
综合利用录井、测井、分析化验、地震及生产动态资料,重新对南堡35-2油田馆陶组沉积特征、油水层测井解释以及油藏模式进行了研究。研究表明:1馆陶组为辫状河沉积而非投产初期认为的曲流河沉积,储层沿沉积主水流线方向分布相对稳定;2结合生产动态研究表明,馆陶组存在一定潜力,储层电阻率在6Ω·m左右解释为油层是合理的,储层沉积韵律的变化是储层底部电阻率下降的主要原因而非以前认为的流体性质变化。综合以上分析,馆陶组油藏模式为构造油藏,并不是投产初期由于油水界面不同而认为的岩性或岩性-构造油藏,增加地质储量近300×104 t,为油田增储上产奠定了基础。
Based on the comprehensive use of logging data,analysis and testing data,seismic and core survey data,a systematic study has been carried out regarding deposit character,log interpretation,and reservoir patterns for Guantao Formation of Nanpu 35-2Oilfield.The study shows that Guantao Formation is braided steam deposit instead of meandering stream,its reservoir is horizontally distributed along with main water flow direction.At the same time,the dynamic and static data indicates that the oil resource potential may be much more than presently discovered,and the lowest oil resistance is around 6Ohm meter,the change of sedimentary rhythm on reservoir is the key factor causing resistance down.Comprehensive studies indicates that the type of reservoir is structural reservoir,but not a lithologic or a lithologic-structural reservoir,which is an incorrect understanding caused by different oil-water contacts determination in the initial production.Based on that,the resource potential of Guantao Formation has been re-confirmed,which increases possible deposit by 300×104 t,which will improve oil fields′output in future.
引文
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