ZZ油田E_2d_1~2隐蔽油藏的超覆边界位置分析

Analysis of the overlap boundary of E_2d_1~2 subtle oil reservoir in ZZ Oilfield

GY凹陷ZZ油田渐新统戴一中亚段(E2d12)隐蔽油藏边界存在不确定问题。根据研究区的测井和钻井资料,综合分析目标地层上倾方向的厚度变化趋势,预测目标地层与下伏地层不整合超覆的边界点,进而落实油藏上倾超覆边界;利用测井约束地震反演法将大面积的连续分布的地震资料与具有高分辨率的井点测井资料进行匹配、转换和结合,预测E2d129号砂体的展布及厚度变化情况,从而分析确定油藏上倾超覆边界。研究结果表明,此两种方法预测的ZZ油田隐蔽油藏上倾超覆边界基本吻合。

The border of subtle oil reservoir of 1st Middle sub-member of Oligocene Dainan Formation （E_2d_1~2） is indeterminate in ZZ Oilfield of Gaoyou Depression.According to data of well logging and drilling,the tendency of interesting strata′s thickness changing in updip direction was synthetically analyzed,to calculate the point of the boundary of the unconformity overriding between interesting strata and underlying layer.The updip overlap boundary of subtle oil reservoir is further defined by those points connection.Using the logging constrained seismic inversion method,the long-range and continuous seismic data were matched,converted,and united with the high resolution well logging data,to predict the distribution,thickness changing of the E_2d_1~2-9 sand body for determining the updip overlap boundary of subtle oil reservoir.The findings indicate that the updip overlap boundary of subtle oil reservoirs predicted by the two methods above-mentioned is approximately anastomosing.