锦州南油田变质岩潜山储层分类及其应用

Reservoir type identification and application of metamorphic rockburied hill in Jinzhou South oilfield

针对渤海湾盆地锦州南油田变质岩潜山裂缝性油藏见水规律复杂、稳油控水难度大的问题,综合运用岩心观察、薄片鉴定、常规测井、成像测井等资料,结合生产动态,从变质岩岩性、储层影响因素入手,研究四种储层类型及其见水规律。研究结果表明:锦州南油田发育片麻岩、混合岩、碎裂岩以及岩浆岩脉;储集空间主要为构造缝、碎裂粒间孔以及溶蚀孔等类型;Ⅰ类储层位于古地貌单元凸起区,发育网状缝,为缓慢稳定型见水;Ⅱ类储层位于古地貌平台区,发育单一缝,为波动上升型见水;Ⅲ类储层位于古地貌斜坡区,发育单一缝,为快速上升型见水;Ⅳ类储层位于古地貌凹陷区,裂缝不发育,为不含水或低含水。研究成果在锦州南油田应用取得了明显稳油控水效果,可为其他类似油田提供借鉴。

To solve the problems of complex water breakthrough law and great difficulty in stabilizing oil and controlling water in fractured reservoir of metamorphic rock buried hill in Jinzhou South oilfield,Bohai Bay,this paper summarized four reservoir types and water breakthrough law by comprehensively using core observation,thin section identification,conventional logging,imaging logging and other data combined with production performance from metamorphic rock lithology and reservoir influencing factors.The results show that:gneiss,migmatite,cataclasite and magmatic dikes are developed in Jinzhou South oilfield;the reservoir space is mainly composed of structural fractures,cataclastic intergranular pores and dissolution pores;Class I reservoir is located in the uplift area of paleogeomorphic unit,with network fractures developed,which has slow and stable water breakthrough type;Class II reservoir is located in the paleogeomorphic platform area,with a single fracture developed,which has a fluctuating upward water breakthrough type;Class III reservoir is located in the slope area,with a single fracture developed,which has a rapidly rising water breakthrough type;Class IV reservoir is located in sag area,with undeveloped fractures and has no or low water cut.The application of the research results in Jinzhou South oilfield has achieved obvious effect of stabilizing oil and controlling water,and it can provide reference for other oilfields of the same nature.