鄂尔多斯盆地南部延长组长7段生烃潜力研究

Research on hydrocarbon generation potential of Chang-7 member in Yanchang formation,Ordos basin

鄂尔多斯盆地南部长7段是有利烃源岩层系,其生烃潜力如何直接影响下一步勘探方向及勘探部署。基于168块岩心、露头及岩屑样品,开展地球化学分析,认为长7烃源岩具有有机质丰度高、成熟度较高、分布广泛的特征。在此基础上建立取心井有效烃源岩测井解释模型,结合235口钻井资料,编制有效烃源岩平面分布图并开展生烃量计算,得出鄂南各探区单位面积的生烃强度和生烃总量。

Chang-7 member of Yanchang formation in the south of Ordos basin is a good hydrocarbon source rock series,and its hydrocarbon generation potential has a direct influence on exploration direction and deployment in the next step.Based on core,outcrop and debris samples of 168-block,the geochemical analysis has been carried out and it is believed that the hydrocarbon source rock of Chang-7 member has characteristics of high organic matter abundance,high maturity and wide distribution range.On the basis of this,the welllogging interpretation model of coring wells on effective hydrocarbon source rock has been established.In combination with drilling data of 235 wells,plane distribution diagrams of the effective hydrocarbon source rock and the hydrocarbon generation quantity calculation have been worked out,and therefore,the hydrocarbon generation intensity and the amount of hydrocarbon generation of each exploration block per unit area in south of Sichuan have been obtained.