Abstract:

Well pattern distribution is not uniform in the NmⅢ12-1 area (Minghuazhen Formation) of the Jidong oilfield, but the quality of seismic data is good. Therefore, integration of well and seismic data method was adopted to study the sand body architecture, and conceptual models of architecture boundaries were established. The accuracy of single channel boundary and point bar sand body identification were effectively improved by combining seismic and well log data. The point bar and its internal configuration were characterized by the “mode-fitting” method, and the horizontal well and dynamic data were used to verify the results. Consequently, 3D reservoir models were established to predict the remaining oil distribution. In the middle and later stages of oilfield development, the remaining oil distribution is mainly affected by the micro-structures, reservoir architecture and well network. The positive micro-structures (e.g. micro-fault nose structure and micro-anticline), is the main site with relatively rich remaining oil. Point bar sand bodies generally have positive rhythm. Under the gravity influence, the lower part of the reservoir is substantially flooded, thus the remaining oil is concentrated mainly in the upper part. Since the abandoned channel and laterally-accreted shale beds often have certain shielding effect on the fluid flow, there are commonly plenty of remaining oil.

Key words: well and seismic data integration, sand body architecture, remaining oil distribution, meandering river, Jidong oilfield, Minghuazhen Formation