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Diagenetic and Reservoir Quality Variation of Miocene Sandstone Reservoir Analogues from Three Basins of Southern California, USA
Journal of Earth Science ( IF 3.3 ) Pub Date : 2020-10-26 , DOI: 10.1007/s12583-020-1289-7
Sunday E. Okunuwadje , David MacDonald , Stephen Bowden

The Miocene sandstone deposits in the Southern California region are important hydrocarbon reservoirs. However, their development has been very challenging due to the wide variability in their reservoir quality. These sandstones have been studied from three sedimentary basins by petrographic thin section, scanning electron microscope, and X-ray diffraction to evaluate and compare the influence of diagenesis on their reservoir quality in these basins. Four petrofacies, namely P1 (sand injectite or dyke), P2 (sub-marine fan), P3 (turbidite and marine-influenced alluvial fans) and P4 (continental sandstones) have been identified. P1 and P2 characterise the sandstones in the San Joaquin forearc basin and are affected by kaolinite and extensive early calcite diagenesis. P3 and P4 delineate the sandstones in the Cajon Valley and Salton Trough strike-slip basins and are dominated by smectite, mixed illite-smectite, early calcite and late calcite diagenesis. Early calcite cement in P3 and P4 is in lower proportion than in P1 and P2. Although the dissolution of these sandstones by acidic fluids did not have a pattern, it, however, has the most considerable influence on P2 creating moldic pores which are expected to increase pore connectivity. The relatively abundant dissolution pores in P2, together with the absence of late authigenic calcite and illite clay in comparison to the other petrofacies studied are likely to make this sandstone facies the best reservoir targets in the Southern California region. These rocks are analogous to producing reservoirs in the region. However, because, petroleum accumulation in these reservoirs are compartmentalized by early calcite cement, maximum recovery using acidified fluids is recommended to dissolve the calcite-filled pores in order to increase connectivity of their pore network and enhance flow potential.



中文翻译:

美国南加州三个盆地的中新世砂岩储层类似物的成岩作用和储层质量变化

南加州地区的中新世砂岩矿床是重要的油气藏。然而,由于其储层质量的广泛差异,其开发一直具有很大的挑战性。通过岩相薄片,扫描电子显微镜和X射线衍射研究了三个沉积盆地中的这些砂岩,以评估和比较成岩作用对这些盆地中储层质量的影响。已经确定了四个岩相,分别为P1(砂岩或堤坝),P2(海底扇),P3(浊积石和受海洋影响的冲积扇)和P4(大陆砂岩)。P1和P2是San Joaquin前臂盆地的砂岩特征,受高岭石和广泛的早期方解石成岩作用的影响。P3和P4描绘了Cajon谷和Salton Trough走滑盆地中的砂岩,并以蒙脱石,伊利石-蒙脱石混合,方解石早期和晚方解石成岩作用为主。P3和P4中的早期方解石水泥所占比例低于P1和P2。尽管这些砂岩在酸性流体中的溶解没有规律,但是,它对P2产生霉菌孔隙的影响最大,预计会增加孔隙连通性。与研究的其他岩相相比,P2中相对丰富的溶蚀孔,以及较晚的自生方解石和伊利石黏土的缺失,很可能使该砂岩相成为南加州地区最佳的储层目标。这些岩石类似于该地区的生产油藏。但是,因为

更新日期:2020-10-26
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