页岩气水平井含气性定量评价方法研究——以涪陵页岩气田为例
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摘要
页岩气水平井含气性评价是页岩气开发评价的难点之一。以四川盆地涪陵页岩气田奥陶系五峰组—志留系龙马溪组页岩为主要研究对象,依据大量页岩气水平井钻井及生产数据,结合研究区探井含气性主控因素的分析结果,优选出4项有效评价页岩气水平井含气性的参数:全烃校正值、孔隙压力系数、测井解释孔隙度及测井解释含气量。选取涪陵页岩气田焦石坝区块的压裂施工参数相当的53口水平井作为样本井,采用赋值法和极大值法对各项参数值统一量纲,再通过灰色关联系数方法计算各项参数的权重,最终建立水平井含气性计算方程。基于计算结果的概率累积曲线,建立了页岩气水平井含气性分级模型。整体上形成了一套能够定量评价页岩气水平井含气性的方法体系。对研究区样本井之外的页岩气水平井进行含气性定量评价,结果与实际生产数据吻合度较高,证实该方法能较好地反映页岩气水平井的含气能力,可以有效预测气井测试产量。
Taking Fuling shale gas field of Sichuan Basin as an example, a method to effectively evaluate the gas content of horizontal well is discussed in Ordovician Wufeng Formation and Silurian Longmaxi Formation.According to a large number of drilling and production data of horizontal wells, and the main controlling factors of gas content in exploration wells, four parameters such as corrected total hydrocarbon of gas logging, pore pressure coefficient, porosity and gas content of log interpretation are chosen for evaluation. Based on samples of 53 wells with equivalent fracturing parameters in Jiaoshiba area, Fuling shale gas field, the four parameters are normalized with assignment method or maximum value method, and the weight of each parameter is calculated with grey correlation coefficient method, then the equation of gas content for horizontal well is setup. Based on the probability accumulation curve of the calculation results, the grading model of gas content is established. Thus a set of methods to quantitatively evaluate the gas content of shale gas horizontal wells is formed. The evaluation results of the other two horizontal wells with the method are in good agreement with the actual production data. It is proved that the method can appraise the gas-bearing capacity and effectively predict the testing output of horizontal wells in shale gas field.
Taking Fuling shale gas field of Sichuan Basin as an example, a method to effectively evaluate the gas content of horizontal well is discussed in Ordovician Wufeng Formation and Silurian Longmaxi Formation.According to a large number of drilling and production data of horizontal wells, and the main controlling factors of gas content in exploration wells, four parameters such as corrected total hydrocarbon of gas logging, pore pressure coefficient, porosity and gas content of log interpretation are chosen for evaluation. Based on samples of 53 wells with equivalent fracturing parameters in Jiaoshiba area, Fuling shale gas field, the four parameters are normalized with assignment method or maximum value method, and the weight of each parameter is calculated with grey correlation coefficient method, then the equation of gas content for horizontal well is setup. Based on the probability accumulation curve of the calculation results, the grading model of gas content is established. Thus a set of methods to quantitatively evaluate the gas content of shale gas horizontal wells is formed. The evaluation results of the other two horizontal wells with the method are in good agreement with the actual production data. It is proved that the method can appraise the gas-bearing capacity and effectively predict the testing output of horizontal wells in shale gas field.
引文
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[3]周文,徐浩,余谦,等.四川盆地及周缘五峰组—龙马溪组与筇竹寺组页岩含气性差异及成因[J].岩性油气藏,2016,28(5):18-25.
[4]张鹏,张金川,黄宇琪,等.黔西北五峰—龙马溪组海相页岩含气性及主控因素[J].大庆石油地质与开发,2015,34(1):169-174.
[5]柳娜,马军,昝川莉.鄂尔多斯盆地页岩含气量测定及方法探讨[J].复杂油气藏,2014,7(3):5-10.
[6]高凤琳,宋岩,姜振学,等.江西修武盆地新开岭组梨树窝组页岩含气性测井综合评价[J].测井技术,2018,42(1):65-72.
[7]周广照,李显明,黄斌,等.优化BP神经网络在川西上三叠统陆相页岩含气性预测中的应用[J].矿物岩石,2017,37(3):90-96.
[8]鲍云杰.从煤层含气量测定技术发展看页岩含气性评价的发展方向[J].石油实验地质,2014,36(6):762-766.
[9]孙健,罗兵.四川盆地涪陵页岩气田构造变形特征及对含气性的影响[J].石油与天然气地质,2016,37(6):809-818.
[10]陈亚琳,罗兵,郁飞,等.四川盆地涪陵地区页岩储层压力预测及高压形成机制分析[J].石油实验地质,2018,40(1):110-117.
[11]杨锋,李生杰,李琪.陆相泥页岩吸附气量预测方法研究[C]//2016中国地球科学联合学术年会论文集(三十三).北京:中国地球物理学会,2016:40-43.
[12]孙才志,宋彦涛.关于灰色关联度的理论探讨[J].世界地质,2000,19(3):248-252.