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万花-劳山区位于鄂尔多斯盆地一级构造单元陕北斜坡的东北部,包括下寺湾和南泥湾2个采油厂,长6油层组是该区重要含油层位之一,2个采油厂结合区域储层方面的研究,特别是储层物性下限研究较少。依据岩心、铸体薄片及扫描电镜观察,研究区长6储层岩石类型主要为细粒长石砂岩,填系物以自生矿物为主,胶结物有方解石、绿泥石等,以孔隙式胶结为主。孔隙类型以粒间溶孔为主,包括少量的剩余粒间孔、粒内孔及微裂缝,孔喉组合为中孔细—微细喉型。孔隙度主要分布区间为7.0%~16.0%,渗透率主要分布区间为0.15×10~(-3)~2.0×10~(-3)μm~2,属于低孔-超低渗储层。利用经验统计法、含油产状法及最小流动孔喉半径法等3种方法,确定了研究区储层物性下限孔隙度为8%、渗透率为0.2×10~(-3)μm~2,检验结果正确率为93.7%,为储量计算、开发生产及后期滚动试油开采提供了依据。
Wanshan - Laoshan is located in the northeast of the northern slope of northern Shaanxi, including the first tectonic unit of Erdos Basin, including two oil production plants of Xiaanshan Bay and Nanniwan. The Chang 6 oil layer is one of the major oil-bearing formations in the area and two oil recovery plants In combination with research on regional reservoirs, there are few studies on the lower limit of reservoir physical properties. According to the observation of cores, cast thin films and scanning electron microscopy, it is mainly studied that the granites in the granites in the Chang 6 reservoir are mainly fine-grained feldspathic sandstones. The fillings are mainly composed of authigenic minerals with calcite, chlorite and so on. Mainly. The pore type is dominated by intergranular dissolved pores, including a small amount of residual intergranular pores, intragranular pores and micro-cracks, and pore-throat combination is mesopore fine-subtle throat type. The distribution of porosity is mainly from 7.0% to 16.0% and the permeability is mainly from 0.15 × 10 -3 to 2.0 × 10 -3 μm 2, which belongs to low porosity and ultra-low permeability reservoirs. By means of empirical statistics, oil production method and minimum flow pore throat radius method, the lower porosity of reservoir property is determined to be 8% and the permeability is 0.2 × 10 ~ (-3) μm ~ 2. The correctness of the test results is 93.7%, which provides the basis for the calculation of reserves, development and production and post-test oil extraction.