塔里木盆地古城地区上寒武统热液改造型储层形成机制与分布预测

发布时间：2018-05-18 22:28

本文选题：热液改造型储层 + 储层形成机制　；参考：《天然气地球科学》2017年06期

【摘要】：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。
[Abstract]:There is hydrothermal activity in the Cambrian and petrology of dolomite in Gucheng area of Tarim Basin. Geochemical characteristics indicate that it is affected by hydrothermal fluid, but the relationship between hydrothermal activity and reservoir formation and reservoir distribution is not clear. Based on the comprehensive analysis of Cambrian lithofacies and paleogeography and the petrological characteristics of the hilly shoal body in the margin belt, it is considered that the Cambrian dolomite is the origin of shallow buried dolomitization in the ancient city area, and the hydrothermal action mode is the later transformation. Develop hydrothermal modified dolomite reservoir. The magnesium isotopic analysis shows that the magnesium ions needed for saddle dolomite precipitation mainly come from the Cambrian itself. The hydrothermal fluid dissolves dolomite first and then accumulates magnesium ions in the layer and then precipitates dolomite. By synthesizing logging and core data and calculating the distance of covariance between the well log response of the reformed section of strong hydrothermal fluid and the section to be predicted, the single well prediction of the revamping strength of hydrothermal fluid in well Chengtan 1 is realized. Combined with three dimensional seismic data, the plane prediction of the strength of hydrothermal transformation of the stratigraphic framework in different periods of the Upper Cambrian is realized. Combined with the differential transformation of the reservoir by hydrothermal fluid, the plane distribution of the reservoir with different reservoir properties is predicted.
【作者单位】：中国石油勘探开发研究院;
【基金】：国家科技重大专项(编号:2011ZX05004-001) 中国石油天然气股份有限公司重大科技专项(编号:2014E-32-01)联合资助
【分类号】：P618.13

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