延安气田东南部本溪组岩相分类及其储层发育特征
刘江斌 , 姚鑫 , 张永飞 , 崔宏俊 , 王文琛
延安大学学报(自然科学版) ›› 2026, Vol. 45 ›› Issue (01) : 10 -16.
延安气田东南部本溪组岩相分类及其储层发育特征
Rock facies classification and reservoir development characteristics of the Benxi formation in the southeastern part of the Yan’an gas field
为研究延安气田东南部本溪组岩相差异下的储层发育特征,在岩心观察的基础上,通过普通薄片、铸体薄片、扫描电镜、高压压汞等方法,分析不同岩相的储层物性及微观孔隙结构特征,研究不同岩相差异下储层发育特征。结果表明,在研究区本溪组识别出了5种储层岩相,分别为交错层理中砂岩相、块状层理中砂岩相、交错层理细砂岩相、块状层理砾岩相、沙纹层理粉砂岩相;本溪组储层以粒间孔、晶间孔、溶蚀孔为主,不同岩相孔隙结构差异较大,平均孔隙度为4.62%,平均渗透率为0.45×10-3 μm2;交错层理和块状层理中砂岩相发育的水动力条件强,原生粒间孔得以保存,晶间孔和溶蚀孔较为发育,储层品质好。交错层理细砂岩相和块状层理砾岩相储层受明显的压实和碳酸盐胶结的影响,储层发育较差。沙纹层理粉砂岩相受到压实作用和伊利石胶结影响,储层性质差。交错层理和块状层理中砂岩相为优质储层相带,其主要分布在研究区中部、西北部,为气田建产的有利目标区域。
To study the reservoir development characteristics of the Benxi Formation in the southeastern part of the Yan'an Gas Field under different rock facies, the physical properties and microscopic pore structure characteristics of different rock facies reservoirs were analyzed through methods such as ordinary thin sections, cast thin sections, scanning electron microscopy, and high-pressure mercury injection. The reservoir development characteristics under different rock facies differences were studied. The results show that five reservoir rock facies were identified in the Benxi Formation in the study area, namely, interbedded cross-bedded medium sandstone facies, massive bedded medium sandstone facies, interbedded cross-bedded fine sandstone facies, massive bedded conglomerate facies, and ripple-bedded siltstone facies. The reservoirs of the Benxi Formation are mainly composed of intergranular pores, intercrystalline pores and dissolution pores. The pore structures of different rock facies vary significantly, with an average porosity of 4.62% and an average permeability of 0.45×10-3 μm2. The interbedded cross-bedded and massive bedded medium sandstone facies have strong hydrodynamic conditions, and the primary intergranular pores are well preserved, with well-developed intercrystalline pores and dissolution pores, and good reservoir quality. The interbedded cross-bedded fine sandstone facies and massive bedded conglomerate facies reservoirs are significantly affected by compaction and carbonate cementation, resulting in poor reservoir development. The ripple-bedded siltstone facies reservoirs are affected by compaction and illite cementation, resulting in poor reservoir properties. The interbedded cross-bedded and massive bedded medium sandstone facies are high-quality reservoir facies, mainly distributed in the central and northwestern parts of the study area, and are favorable target areas for gas field development.
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陕西省重点实验室基金项目(WSFRM202105502002)
延安科技计划项目(2023-GYGG-040)
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