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鄂尔多斯盆地华庆地区延长组长6段储层砂岩属于湖盆中部的砂质碎屑流成因,主要经历了压实作用、胶结与交代作用、溶蚀作用和烃类侵位等成岩作用,目前处于中成岩阶段的A期。研究区的主要孔隙类型为粒间溶孔、粒间孔隙和粒内溶孔,以粒间溶孔为主。孔隙演化整体上呈减小趋势,其中压实作用和胶结作用是孔隙减少的主要成岩作用,使原始孔隙度损失将近90%,是研究区长6段储层成为特低孔特低渗储层的主要因素;溶蚀作用和烃类侵位对孔隙具有建设性作用,其中溶蚀作用决定了华庆地区长6段优质储层的发育状况,产生的次生孔隙占原生孔隙的15.9%。
The sandstone in the 6th member of Yanchang Formation in Huaqing area of Ordos Basin belongs to the genesis of sandy debris flow in the central part of the lake basin and mainly experienced diagenesis such as compaction, cementation and metasomatism, dissolution and hydrocarbon emplacement, A stage in the diagenetic stage. The main types of pores in the study area are intergranular dissolved pores, intergranular pores and intragranular dissolved pores, with intergranular dissolved pores as the main. The pore evolution has a decreasing trend as a whole. Compaction and cementation are the main diagenesis of pore reduction, which makes the original porosity loss nearly 90%, which is the reason that the reservoir of Chang 6 Member of the study area becomes the ultra-low porosity and ultra-low permeability reservoir . The dissolution and hydrocarbon emplacement play a constructive role in the porosity. The dissolution of these factors determines the development of the high-quality reservoirs in the Chang 6 Member in Huaqing area, and the secondary porosity is 15.9% of the primary porosity.