地下曲流河点坝砂体规模定量表征研究——以渤海C油田明化镇组为例

Quantitative characterization research for point bar sand body of subsurface meandering river environment: Taking Minghua Formation of Bohai C Oilfield as an Instance

针对海上油田大井距、稀井网条件下的河流相储层构型精细表征,在垂向河道期次划分基础上,结合现代沉积经典定量模式,采用"定量模式指导下,井震结合划边界,模式拟合组平面"的思路实现对地下曲流河点坝砂体的定量表征。该方法综合了密井网解剖法与地震沉积学方法的优点,有助于提高井间砂体预测与储层内部结构表征的精度;总结了曲流河河道砂体平面形态模式及其控制机理。研究结果表明,基于现代沉积和露头统计分析得到的曲流河定量模式应用于地下点坝砂体规模的定量表征合理可行。

Aiming at the architecture fine characterization of the fluvial reservoir in the offshore field under the condition of the large well distance and low well pattern, based on the vertical river channel period division, and combined with the recent classical quantitative method of sedimentology, we defined the reservoir boundary and mode simulation to determine the plane by the guidance of quantitative model, and the combination of well and seismic information, to achieve the quantitative characterization research for point bar sand body of subsurface meandering river environment. This method combined the advantages of dense well pattern dissection with the seismic stratigraphy, so that to approve not only the cross-well sand body extension prediction, but also the reservoir structural characterization precision. Meanwhile, we summarized the meandering river channel sand plane geometry form and its control mechanism. The results show that the quantitative characterization method of channel sandbody in surface meandering river by statistical analysis of modern deposits and outcrops is also feasible for the subsurface environment.