Ⅰ型有机质生油增压数学模型建立与应用  

Establishment and application of mathematical model ofoil generated overpressure by type I organic matter

作　　者：赵阳[1] 徐小龙 阙仕煜 段毅 ZHAO Yang;XU Xiaolong;QUE Shiyu;DUAN Yi(College of Petroleum Engineering,Liaoning Petrochemical University,Fushun City,Liaoning Province,113000,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou City,Gansu Province,730000,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113000 [2]中国科学院西北生态环境资源研究院,甘肃兰州730000

出　　处：《油气地质与采收率》2023年第5期57-62,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目“沉积单体芳烃生物标志化合物氢同位素的主控因素及其示踪研究”(41972110)。

摘　　要：生油增压定量化研究是计算油气成藏动力并进一步确定油气分布的关键。目前已有的生油增压计算方法较复杂或计算精度不足,影响其在勘探中快速应用。基于Ⅰ型有机质生烃特征综合分析,建立了生油增压数学模型,并将该模型应用于鄂尔多斯盆地西峰油田长7段烃源岩生油增压的计算,同时分析了不同参数对生油增压的影响。结果显示,西峰油田长7段烃源岩生油增压为4.6~14.8 MPa,地层压力与前人计算结果相近,说明模型具有较高的可靠性。参数敏感性分析表明,岩石压缩系数对生油增压影响程度最大,为99.056%;总有机碳含量影响程度为0.342%;生烃影响因子和干酪根生油转化效率对生油增压的影响程度分别为0.261%和0.250%;孔隙度和地层压力对生油增压的影响程度较小,分别为0.09%和0.001%。模型同时揭示,较高的地层压力不利于生油增压,地层压力越高,增压越小。Quantitative study on oil generated overpressure is the key to calculating the dynamics of oil and gas reservoirs and determining the distribution of oil and gas.The existing calculation methods of oil generated overpressure are low in calculation accuracy and complex,which affect their rapid applications in exploration.In this study,according to the comprehensive analysis of hydrocarbon generation characteristics of type I organic matter,a new mathematical model of oil generated overpressure was established.The model was used to calculate the oil generated overpressure of Chang7 source rock in Xifeng Oilfield of Ordos Basin and analyze the influence of different parameters on the oil generated overpressure.The results show that the oil generated overpressure of Chang7 source rock in Xifeng Oilfield is 4.6-14.8 MPa,and the formation pressure is similar to the previous calculation results,which indicates that the model is highly reliable.The sensitivity analysis of rock parameters shows that the rock compressibility factor has the greatest influence on the oil generated overpressure,with a value of 99.056%,followed by the total organic carbon content,with a value of 0.342%.The influence of hydrocarbon generation factor and kerogen oil-generating conversion efficiency on the oil generated overpressure is 0.261%and 0.250%,respectively,and the porosity and formation pressure have a relatively small effect on the oil generated overpressure,which is 0.09%and 0.001%,respectively.The model also reveals that higher formation pressure is not conducive to oil generated overpressure,and higher formation pressure makes the oil generated overpressure smaller.

关 键 词：烃源岩 Ⅰ型有机质 压缩性 生油增压 敏感性分析 

分 类 号：TE341[石油与天然气工程—油气田开发工程]