砂岩储集层孔隙度评价的热解失重方法

充分发挥录井资料的优势进行储层物性、含油性的现场快速评价,无论是对于探井的油气发现还是开发井的水淹层评价均具有十分重要的意义。在深入分析影响岩石热失质量的主要因素、充分考虑目前岩石热解仪的升温程序的基础上,提出了计算储层岩石骨架质量的泥质和碳酸盐含量校正方法,建立了具有普遍适应性的储层孔隙度热失重评价模型。运用此模型对黄骅坳陷北大港油田港东开发区港5-26-2井明化镇组和王官屯油田官50-4-4井枣V油组进行了实际孔隙度评价,并将评价结果与岩心实验室分析和测井解释结果进行了比较。结果表明,利用该模型计算的储层有效孔隙度精度较高,平均相对误差在8%以内。

Evaluation method of sandstone reservoir porosity through thermal decomposition weightlessness

It is very important for finding oil and gas in the exploratory well or evaluating water-flooded layer in the development well to evaluate reservoir physical property and oil bearing on location by using the advantage of logging data. A calculation method of rock framework weight modified by shale and carbonate content was presented, and the evaluation model of reservoir porosity thermal decomposition weightlessness was improved by analyzing the main influence factor of rock thermal decomposition weightlessness and considering the heat program of rock pyrologger. This model was applied in Minghuazhen group of well Gang 5-26-2 in Gangdong Oilfield and Zao-V group of well Guan 50-44 in Wangguantun Oilfield, northern of Huanghua depression. Compared with the result of bore core laboratory analysis and the result of well log interpretation, the precision of computing reservoir availability porosity is relatively high and its average relative error is not more than 8%.