WZ12-1油田南块涠四段油层有效厚度研究

Research on effective thickness of Wei 4 reservoir in the southern area
of WZ 12-1 Oilfield

宋子齐 李文芳 唐长久 庞振宇 李玮峰

西安石油大学，陕西 西安 710065

Xi’an Shiyou University, Xi忆an 710065, China

针对WZ12-1油田南块涠四段低孔、低渗、低电阻率油层有效厚度划分中存在的问题，提出了油层有效厚度划分的图版参数。利用目的层段测井、地质和试油资料的统计分析和综合归纳，建立起储层岩性、电阻率、孔隙度、泥质质量分数、渗透率及含油饱和度的有效厚度下限标准。从而，在该区低电阻率、低孔、低渗、高水饱油层有效厚度评价中精细地反映储层岩性、物性和含油性特征，有效地剔除了钙质及泥质夹层、致密层、干砂层和不够标准的差油层，确定了各井油层的有效厚度，提高了测井解释和储层研究精度，为该区低孔低渗油田增储上产提供了有利目标。

Aimed at the problems that exist in the effective thickness division of the oil reservoirs with low porosity, low permeability and low resistivity in the southern area of WZ 12-1 Oilfield, the plate parameters identifying effective thickness for oil reservoirs were put forward. Based on the statistical analysis of logging, geology and well testing data in the target beds, the cutoff standards of effective thickness of lithology, resistivity, porosity, shale content, permeability and oil saturation were proposed. Thus, the reservoir lithology, reservoir physical property and petroliferous property were reflected in the effective thickness evaluation with low
resistivity, low porosity, low permeability and high water saturation reservoirs. The calcareous and muddy intercalations, tight reservoirs, dry sands and under-standard poor reservoirs were effectively eliminated in the studied layers. The effective thickness of oil reservoirs in every well was determined. This method can guarantee the precision of log interpretation and reservoir study, which offers the favorable targets for increasing reserves and production in the studied reservoirs.