论文部分内容阅读
塔里木盆地古城地区寒武系存在热液活动且白云岩的岩石学、地球化学特征表明其受到了热液的影响,但热液活动与储层形成之间的关系以及储层的分布特征尚不明确。根据寒武纪岩相古地理和台缘带丘滩体岩石学特征的综合分析,认为古城地区寒武统白云岩为浅埋藏白云岩化作用成因,热液的作用方式是后期改造,发育热液改造型白云岩储层。镁同位素分析表明,鞍形白云石沉淀所需的镁离子主要来自于寒武系本身,热液流体先对白云岩进行溶蚀,层内富集镁离子后再发生白云石沉淀。综合测井、岩心资料,通过计算强热液改造段与待预测井段的测井响应之间的协方差距离,实现了城探1井热液改造强度的单井预测。与三维地震资料相结合,实现了上寒武统各期丘滩体等时地层格架的热液改造强度的平面预测。结合热液流体对储层的差异改造,预测了不同储集性能的热液改造型储层的平面分布。
The Cambrian of the ancient city in the Tarim Basin has hydrothermal activities and the petrological and geochemical characteristics of dolomite indicate that it is affected by hydrothermal fluids. However, the relationship between hydrothermal activity and reservoir formation and the distribution of reservoirs are not yet clear. According to the lithofacies-paleogeographic analysis of Cambrian and the petrological characteristics of the rivulets in the margin of the margin, the authors think that the Cambrian dolomite in the ancient city is the genesis of the shallow burial dolomitization. The hydrothermal mechanism is the later alteration and hydrothermal reformation Type dolomite reservoir. Magnesium isotope analysis shows that the magnesium ions required for the precipitation of saddle-shaped dolomite mainly come from the Cambrian itself. The hydrothermal fluid firstly dissolves the dolomite, and the dolomite precipitates after the magnesium ions are enriched in the layer. Based on the comprehensive logging data and core data, the single well prediction of hydrothermal reforming intensity of the well 1 is completed by calculating the covariance distance between the well logging response of the well to be forecasted and the section to be predicted. Combined with the 3D seismic data, the plane prediction of the hydrothermal reforming intensity of isochronous stratigraphic framework at the upper Cambrian is reached. Combined with the alteration of hydrothermal fluids to reservoirs, the planar distribution of hydrothermal reservoir with different reservoir properties is predicted.