鄂尔多斯盆地马岭长81储层流动单元研究

马岭油田是鄂尔多斯盆地较早开发的油田，位于鄂尔多斯盆地西南部，属于陇东北部地区。长8油层组是一套以三角洲前缘相为主的陆源碎屑沉积，发育泥岩、泥质砂岩及中一细砂岩，形成一套低孔、低渗一特低渗油层组。目前，对该油层组的储层、油藏关系等研究还比较少。为了更高效的勘探和开发，用流动分层指标法，根据5口关键井的岩心分析资料和测井资料，计算和提取了流动分层指标和储集层品质指数，结合孔隙度、渗透率等物性参数确定了该区长8，储层流动单元的划分标准，即将长8，储层流动单元定义为4类，Ⅰ类的储集性能最好，Ⅳ类的储集性能最差。根据此划分标准，利用区域内其他井的流动单元流动指标、孔隙度、渗透率等参数对储层流动单元进行定量评价，初步预测了马岭长8，西北部各油层组流动单元平面分布，为下一步挖潜提供依据。

Research on Reservoir Flow Unit of Maling Oilfield in Ordos Basin

Maling Oilfield is one of the early developed oilfields which located in southwest Ordos Basin, the north-east region of Gansu. Chang 8 group is a set of delta front facies of terrigenous clastic sediments which developed mudstone, argillaceous sandstone and mid - fine grained sandstone, forming a set of low porosity and low permeabili- ty - extra - low permeability reservoir group. Currently, there are few researches about the reservoir and oil deposit. In order to explore and develop more efficient, according to five key wells＂ core analysis and logging data, use Fz~ method to calculate and extract Fz~ and RQ~, then combine porosity, permeability and other physical parameters to determine the classification standard Chang 81 reservoir flow units. Chang 81 reservoir flow unit is defined as 4 classed, reservoir properties of class I is the best, class IV is the worst. On the basis of this classification standard, use flow indicators, porosity, permeability and other parameters of the other wells＂ mobile unit in this area to do quantitative evaluation of reservoir flow units. Then initially predict the horizontal distribution of Chang 81 reservoir flow unit in northwest Maling, moreover,it provide the reliable basis to potential power in future.