直罗油田黄家岭区长2储层特征及物性研究
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摘要
利用岩心分析、铸体薄片、压汞和扫描电镜等方法,研究了直罗油田黄家岭区长2储层的特征及影响因素。黄家岭区长2储层岩石主要为细粒长石砂岩,平均孔隙度为14.0%,平均渗透率为1.23×10~(-3 )μm~2,属于低孔特低渗储层。孔喉类型为小孔-细、小孔-微细喉型;水下分流河道微相的物性比分流间湾微相要好。压实与压溶作用会降低储层物性,但对长2储层影响不大;溶蚀作用和破裂作用有利于改善储层物性,对长2储层的影响较大。综合储层性质,参照鄂尔多斯盆地中生界碎屑岩储集层分类评价标准,将该区长2储层划分为4种类型,分别对应于此评价标准中的Ⅲ_b、IV_a、Ⅳ_b、Ⅴ类。
The core characteristics and influencing factors of the Chang 2 reservoir in Huangjialing area of Zhiluo Oilfield are studied by core analysis, casting thin section, mercury intrusion and scanning electron microscopy. The Chang 2 reservoir rocks in Huangjialing area are mainly fine-grained feldspar sandstones with an average porosity of 14.0% and an average permeability of 1.23×10~(-3) μm~2, which is a low-porosity and ultra-low permeability reservoir. The pore throat type is small pore-fine, small pore-micro fine throat type; the physical properties of the underwater split channel microfacies are better than the split flow microfacies. Compaction and pressure dissolution will reduce the reservoir physical properties, but have little effect on the Chang 2 reservoir; dissolution and rupture are beneficial to improving the reservoir physical properties, and have a greater impact on the Chang 2 reservoir. Based on reservoir property and the criteria for classification of the Mesozoic clastic reservoirs in Ordos Basin, the Chang 2 reservoirs are divided into four types, which correspond to the III_b, IV_a, IV_b, and V categories in this evaluation standard.
The core characteristics and influencing factors of the Chang 2 reservoir in Huangjialing area of Zhiluo Oilfield are studied by core analysis, casting thin section, mercury intrusion and scanning electron microscopy. The Chang 2 reservoir rocks in Huangjialing area are mainly fine-grained feldspar sandstones with an average porosity of 14.0% and an average permeability of 1.23×10~(-3) μm~2, which is a low-porosity and ultra-low permeability reservoir. The pore throat type is small pore-fine, small pore-micro fine throat type; the physical properties of the underwater split channel microfacies are better than the split flow microfacies. Compaction and pressure dissolution will reduce the reservoir physical properties, but have little effect on the Chang 2 reservoir; dissolution and rupture are beneficial to improving the reservoir physical properties, and have a greater impact on the Chang 2 reservoir. Based on reservoir property and the criteria for classification of the Mesozoic clastic reservoirs in Ordos Basin, the Chang 2 reservoirs are divided into four types, which correspond to the III_b, IV_a, IV_b, and V categories in this evaluation standard.
引文
[1] 李育.直罗油田黄家岭区延长组长2低孔渗砂岩储层特征[J].石油化工应用,2016,35(4):93-98.
[2] 石妍,彭遥圆,袁烨琪,等.直罗油田延长组长2段岩性油藏储量参数计算方法研究[J].辽宁化工,2015,44(11):1401-1403.
[3] 常伟丽,王桂成,闫帅,等.直罗油田长2油层组沉积微相及油气富集因素[J].东华理工大学学报(自然科学版),2015,38(1):43-48.
[4] 赵靖舟,吴少波,武富礼.论低渗透储层的分类与评价标准:以鄂尔多斯盆地为例[J].岩性油气藏,2007,19(3):28-31.
[5] 李少卓.直罗油田L29井区长2储层评价[D].西安:西安石油大学,2018.
[6] 常伟丽.直罗油田黄家岭探区延长组长2段储层评价[D].西安:西安石油大学,2015.
[2] 石妍,彭遥圆,袁烨琪,等.直罗油田延长组长2段岩性油藏储量参数计算方法研究[J].辽宁化工,2015,44(11):1401-1403.
[3] 常伟丽,王桂成,闫帅,等.直罗油田长2油层组沉积微相及油气富集因素[J].东华理工大学学报(自然科学版),2015,38(1):43-48.
[4] 赵靖舟,吴少波,武富礼.论低渗透储层的分类与评价标准:以鄂尔多斯盆地为例[J].岩性油气藏,2007,19(3):28-31.
[5] 李少卓.直罗油田L29井区长2储层评价[D].西安:西安石油大学,2018.
[6] 常伟丽.直罗油田黄家岭探区延长组长2段储层评价[D].西安:西安石油大学,2015.