歧口18-1油田沙河街组层序地层

STUDY ON THE SEQUENCE STRATIGRAPHY OF SHAHEJIE FORMATION IN QIKOU 18-10ILFIELD

歧口18—1油田自投产以来，由于井控程度低，储层横向变化大，导致砂体延伸方向及连通性等认识不清，为目前注采井网完善和后期开发调整带来很大挑战。因此，以经典层序地层学理论作指导，建立了高精度层序地层格架；充分应用岩心、测井、地震属性和地震反演等资料，在高频地层格架下对扇三角洲砂体精细刻画，综合分析各级层序单元的沉积体系发育特点，编制相应的沉积相图，客观地再现沉积环境。研究成果为后期滚动勘探和开发调整提供了理论基础，同时为类似油田的沉积微相研究提供了借鉴。

Since QK 18-10ilfield was put into production, because of low-degree well control and a great change in lateral reservoirs, there have been several problems, for example the understandings of the extended directions of the sandbodies, connectivity and so on are not made clear, thus the rather serious challenges are brought for the improvement of current injection-production well spacing and later development adjustment. Therefore, guided by classic sequence stratigraphy theory, the high-precision sequence frame is established; through the well-adopted data： cores, logs, seismic attributes ＆ inversion and so forth, the fan delta sandbodies are finely described under the high-frequence stratigraphic frame, the developed characteristics of the sedimentary system in each grade of sequence unit are comprehensively analyzed, the corresponding sedimentary facies maps are compiled to objectively redisplay the sedimentary environments. The studied achievements have provided the theoretical basis for the later progressive exploration and development adjustment; at the meantime, they have presented the reference for the studies of sedimentary microfacies of similar oilfields.