一种特低渗透油层有效厚度标准研究

低渗透储层有着不同于常规储层的测井响应，其测井响应中来自油气的成分少，有生产能力的低孔隙度储层与无效层段之间的差异很少，测井解释的难度很大。针对白豹油田长3、长4＋5低渗透油层有效厚度及其夹层的测井响应特征，利用自然伽马、自然电位、声波时差、密度、中子、微电极等多种测井曲线，结合岩心分析、地质及试油等资料综合对比研究，充分利用了测井资料识别影响低渗透储层参数变化的地质因素及特点，建立了有效厚度的物性、电性下限和夹层扣除标准。通过该区目的层段80多口井低渗透储层的精细评价处理，有效地剔除了钙质夹层、泥质夹层、致密层、千砂层和不够标准的差油层，确定了各井油层有效厚度，提高了该区目的层段油藏测井解释和有利区预测的精度，为该区特低渗透油田增储上产提供了可靠依据。

Study on effective thickness standard for ultra-low permeable reservoir

Low permeable reservoir has different logging response with conventional reservoirs. Its logging response has little from oil and gas, and little difference between reservoir with low porosity and productivity and inefficient intervals. Logging interpretation has much difficulty. Facing logging response of effective thickness of Chang 3 and Chang 4+5 low permeable reservoirs and their interbeds, this paper uses natural gamma ray, natural potential, interval transit time, density, neutron and microelectrode logging curves combining with core analysis, geologic and oil testing data to establish standard for property, electric lower limit and interbed removal of effective thickness. Through detailed evaluation on lower permeable reservoirs in 80 wells in this area, it removes calcium interbeds, muddy interbeds, tight layers, dry sand layers poor oil layers not conforming to standard, determines effective thickness of each well, and increases accuracy of logging interpretation and favorable area prediction of target reservoirs in this area.