Fine Characterization of High-Quality Sand Bodies in Xingqi West IV Block and Residual Oil Analysis

Abstract At present, oilfield A is in the late stage of development with ultra-high water cut. The comprehensive water cut has reached more than 95%, and the remaining oil in the whole area is highly dispersed. The tertiary infill well in block X of oilfield a was drilled and put into production in 2024. The reservoir is mainly deposited in the outer front of the Delta, and sheet sand is widely developed. After well pattern infilling, fine geological dissection was carried out[11]. The channel sand in S1 and S2 layers of s oil formation was well developed, and the remaining oil was still analyzed by logging technology. In this paper, the underwater distributary channel and estuary bar sandbody are finely identified by logging facies pattern, and the plane and longitudinal residual oil analysis is carried out by combining the dynamic and static analysis. The S1 and S2 layers are perforated, and good development results are achieved. Well m has a daily oil production of 5.7 tons and a water cut of 68.0% in the initial stage of production. This method can provide strong technical support for the later development adjustment of the oilfield.