渤海油田中深层扇三角洲储层研究新方法--以金县油田为例

A NEW METHOD FOR STUDYING MIDDLE AND DEEP FAN DELTA RESERVOIRS IN BOHAI OILFIELD

扇三角洲储层精细表征方法一直是国内外学者研究的难点和热点,中深层储层由于地震资料品质差对沉积储层刻画难度大,海上油田受困于作业成本限制,难以通过密井网实现储层精细研究。结合层序地层学研究、通过物源定量模拟实验以及原油色谱指纹技术综合研究明确了储层展布规律和连通关系,并确立了对于中深层扇三角洲储层研究的新方法。首先针对3种不同地层倾角、不同物源类型的供给模式进行模拟,结合重矿物资料、成熟系数以及井资料确立了2种物源发育模式,即同源同支和同源不同支。结合原油色谱指纹、岩心、录井、测井和地球物理等资料,在沉积模式的约束下进一步明确了储层连通关系,确立了储层发育特征。综合储层精细表征、地质建模及数值模拟技术,明确了储层连通关系,同一河道范围内储层连通性好,不同河道之间连通关系为弱连通或不连通。地质建模过程中综合重矿物、成熟系数以及砂岩展布特征分析的结果,将物源方向细化为为87～131度,对应为主变程这一变量;在此基础上的相控地质建模更能反映储层发育特征,为全区河道砂体的解剖提供了定量、可靠的地质模式,且基于该地质模型的数值模拟结果与生产实际吻合度高,产液结构调整措施取得了良好效果。该研究思路有助于提高地质建模的准确度,对解决实际生产问题也具有指导意义。

The fine characterization of the fan delta reservoir has been the difficulty and hotspot of the domestic and foreign scholars.In this paper,the supply model of three different stratigraphic inclinations and different provenances is simulated by the quantitative simulation experiment.Coefficient and well data to establish the two species of developmental model is homologous and homologous different branch.Based on the data of crude oil chromatographic fingerprint,core,logging,logging and geophysics,the reservoir connectivity is further defined under the constraint of deposition model,and the reservoir development characteristics are established.Based on the comprehensive fine reservoir characterization and geological modeling and numerical simulation,the development of the main oil group in the E-3D well area of Jinxian Oilfield in Bohai Sea is divided into three branches,the river width is293-519m,the length is502-1217m,The reservoir connectivity is good and the connectivity between the different rivers is weakly connected or not connected.The three-dimensional geological model under the control of sedimentary microfacies is more accurate to reflect the characteristics of reservoir development,and the results of reservoir,the results of this study enrich the method of reservoir characterization and provide a reference to improve the developmerit of Jinxian oilfield to provide reference for the reasonable development of similar oilfield.