【摘要】 流花11–1生物礁油田是中国新近系目前发现的最大整装型生物礁油田,油田开发期间在不同构造部位的油井含水上升速度不同,前人已对油田含水地质因素进行分析,但对油田含水上升迅速的源头认识不足,严重制约了油田的采收。将层序地层学理论、碳酸盐岩成岩作用机理和构造运动相结合,平面上依靠高分辨率三维地震资料条件下利用叠前AVO反演的G属性所刻画的油水界面平面展布图,纵向上依靠叠前同步反演获得的vp/vS剖面图和密度转换的孔隙度剖面图,发现了多处底水刺穿油水界面形成的上窜通道,有力地论证了17.5 Ma和16.5 Ma层序界面附近暴露时产生的溶洞、溶缝及东沙运动产生的裂缝为流花11–1生物礁油田底水快速锥进的源头,其中溶洞为主要底水上窜通道。更多还原

【Abstract】 Up to now,the bioherm oilfield of LH11–1 is the largest uncompartmentalized one in tertiary systems in China.In the developing period,the water cut in the different formations and structures is rising at various velocities. Although field water-composing geological factors were analyzed before,there is still lack of understanding and recognition on the sources of fast water-cut rise,which might severely restrict oil recovery. By the combination of sequence stratigraphy,carbonate rock diagenesis mechanism and tectonic movement,horizontally referring to the oil-water interface planar layouts featured by G attributes of AVO pre-stack inversion under the condition of high resolution 3-D seismic data,and vertically considering the vp/vSobtained through pre-stack simultaneous inversion and the porosity profile of density conversion,the authors find the ascending channels formed by multiple bottom-water piercing oil-water interface,convincingly verifying that the Karst caves and seams created when the nearby areas surrounding the sequence interfaces between 17.5Ma and 16.5Ma get exposed,and the fractures formed by Dongsa movement are the three sources for Fast Coning of Bottom Water in the bioherm Oilfield of LH11–1. Among them,the Karst caves are the major ascending channels.更多还原