结合地质统计学反演的综合储层研究与应用

五3东区P_3w时期主要发育冲积扇扇根亚相沉积和扇中亚相沉积。其中P3w1段冲积扇砂体分布广泛,相带宽阔,为研究主要目的层段。纵向上,P_3w_1段从上至下又可以分为P_3w_1~1、P_3w_1~2、P_3w_1~33个砂层组。在已知地质规律、井震资料、约束稀疏脉冲反演、地质统计学参数的基础上,对研究区进行地质统计学反演研究。结合反演结果,在已知地质认识的基础上,对目的层内砂体的沉积模式以及油藏的储盖特征进行分析研究。研究表明,该区域砂体平面上呈扇状展布,冲积扇沉积特征明显,扇根砂体较扇中更为富集,平面上具有分带性;纵向上,P_3w_1~2、P_3w_1~3段储集砂体发育较好,P_3w_1~1段发育的凝灰质充填的致密层,波阻抗呈高阻特征,可以作为下伏有利储层的区域盖层。整体上砂体退积特征明显,呈正旋回结构,垂向上具有分层性。该研究为落实该区扇体内储层的分布特征提供了有利依据。

Comprehensive research and application of reservoir in combination with geostatistical inversion

In Wusandong area, the P3w Formation main contains upper fan and mid fan deposits. P3w1 Member is the main target layer with the characteristics of wide sandbodies and phase spread. In the longitudinal, P3w1 Member contains (from top to bottom) P3w11, P3w12 and P3w13 three sand groups. In this paper, based on geological regularity, well seismic data, constrained sparse pulse inversion and geostatistical parameter analysis, geostatistical inversion study was applied to study area. Combined with the inversion results, on the basis of known geological knowledge, the sandbody sedimentary model and oil reservoir-cap characteristics for the target layer were analysed and researched. Studies have shown that the sedimentary characteristic of alluvial fan is obvious, the sandbodies in upper fan are more abundant than them in the mid fan with characteristics of zonality in the plane, while in the longitudinal, the reservoir sandbodies develop well in P3w12 and P3w13 member, the tuffaceous filling compact layer with the characteristic of high impedance can be used as the regional caprock for favorable reservoir in the lower, on the whole, the study area has the sandbodies with obvious retrogradation characteristic, positive cyclicity and vertical stratification. Therefore The research can provide an advantageous basis of understanding reservoir distribution features in the fan.