东方1-1气田开发地震技术的应用

Application of seismic techniques to the development of the Dongfang 1-1 Gas Field,Yinggehai Basin

位于莺歌海盆地中央的东方1-1气田受海上作业条件限制,部署的井位数量相对较少,井控范围大,对地震资料的依赖度高。为达到高效开发气田的目的,针对其储层复杂、非均质性强的特点,利用有色反演技术结合倾角切片等资料进行了多体构造分析及砂体精细描述,并利用时频三原色信息来指导隔、夹层的准确雕刻,最终实现了对该气田储层空间几何形态的精细描述;同时,利用叠后资料地震属性及地质综合资料,进行了相控储层预测,结合叠前弹性反演、吸收等信息对储层的物性变化及含气性进行了预测。研究成果对该气田开发井位部署、地质储量的确定等方面起到了重要作用,并由此建立起了一套适应莺歌海盆地储层评价、气田开发的地球物理技术系列。

During the development of the Dongfang 1-1 Gas Field in the Yinggehai Basin,engineers,restricted by the offshore condition,have to reduce the number of well sites deployed,try to keep wells under control in a large scope,and highly rely on the seismic data.In view of this,aiming at the complexity and great heterogeneity of reservoirs in this field,the fine description of sandbodies and structures are performed by use of the seismic colored inversion combined with the data like inclination slice.On this basis,the accurate description of interlayers or insulating layers in the reservoirs guided by the RGB colors in time frequency distribution.As a result,the geometry of the reservoir space in this field is delicately displayed.Meanwhile,the facies-control reservoir models are built for reservoir forecasting by use of post-stack seismic data and seismic attributes,and in combination with such information as pre-stack elastic inversion,adsorption,etc.,the petrophysical properties and gas-bearing capacity of reservoirs are also predicted.The study results play an important role in the well sites deployment and the determination of geological reserves in the development of an offshore gas field,and the most important of all,a series of geophysical techniques are collected for the reservoir assessment and field development adaptable for the fields in the Yinggehai Basin.