海拉尔盆地复杂断块油藏不同岩性储层开发调整技术

Development and Adjustment of Different Lithology Reservoirs in Complex Fault Block Reservoirs in Hailaer Basin

结合海拉尔盆地储层地质特征和开发现状,分析了其不同岩性储层开发中存在的问题。海拉尔盆地属于复杂断块油藏,具有含油面积小、断块破碎、构造倾角大、扇三角洲沉积、非均质性强、油层变化快等地质特点,储层岩性包含砂砾岩、裂缝性潜山、含凝灰质砂岩及特低渗透致密砂岩储层。投入开发以来,受复杂地质条件影响,砂砾岩油藏含水上升快、潜山油藏底水锥进快,含凝灰质储层特低渗及致密砂岩储层水井注入困难,难以建立有效驱动体系。针对不同岩性储层暴露的开发矛盾,以油藏精细描述为指导,实施井网加密、注聚调剖、周期注水、注CO2混相驱及大规模压裂等调整对策。通过近10年开发调整,改善了海拉尔盆地复杂断块油藏开发效果,形成了一套适合海拉尔盆地复杂断块油藏不同岩性储层的综合调整技术。

Based on the geological characteristics and development status of the reservoirs in Hailaer Basin,the existing problems in the development of different lithology reservoirs were analyzed.Hailaer Basin is a complex fault block reservoir with small oil-bearing area,broken fault block,large structure dip,fan delta deposit,strong heterogeneity,rapid reservoir change and other geological features.The reservoir lithology includes glutenite,fractured buried hill,tuffaceous sandstone and ultra-low permeable tight sandstone reservoir.Since it was put into development,due to the influence of complex geological conditions,the water cut in the glutenite reservoir rises rapidly;the water cone at the bottom of the buried hill reservoir advances rapidly;the well injection in tuffaceous reservoir and the ultra-low permeable tight sandstone reservoir is difficult and it is difficult to establish an effective driving system.In view of the development contradiction exposed by different lithology reservoirs,and under the guidance of fine reservoir description,a series of adjustment countermeasures were implemented,such as well pattern infilling,polymer injection for profile improvement,periodic water injection,CO 2 injection miscible flooding,large-scale fracturing,etc.Through the development and adjustment in the recent decade,the development effect of complex fault block reservoir in Hailaer Basin has been improved,and a set of comprehensive adjustment technology suitable for different lithology reservoirs in the complex fault block reservoir in Hailaer Basin has been formed.