柴达木盆地勘探地层学研究的启示

Some inspiration from exploration stratigraphic study in Qaidam basin.

地层学是地质学的一门重要的基础学科。柴达木盆地 4 0多年油气勘探实践表明 ,地层分析对于油气勘探开发的理论与实践都至关重要 ,地层学研究是一项贯穿于油气勘探与开发全过程的重要的基础工作。在柴达木盆地以往的勘探开发实践中 ,钻井设计的地层分层与完井数据常常有很大出入 ,这既是由于地下地质的复杂性以及当时的认识水平所限 ,也由于地层分析的重要性尚未得到足够的重视。若加强钻前地层研究 ,巨大误差是可以减少的。分析乌参 1井、茫南 1井和红中 9井等典型实例 ,总结地层学研究的教训 ,认为 :在地层研究中要有对于整个盆地的全局观念 ,掌握全盆地的资料 ;要重视古生物资料在地层分析中的重要作用 ;综合对比是提高地层研究精度的重要保证。图 3表 2参

Stratigraphy is one of the basic subjects of most significance in geology. Stratigraphic analysis takes an important role in theoretic research and practice of petroleum exploration and development; basin analysis, petroleum system analysis and preliminary exploration of traps even petroleum development depend on it. The design of well location and depth is mostly dependent on stratigraphic study. On the other hand, wells can provide new information that can give more accurate control over design of new ones. So stratigraphic study is one fundamental work throughout petroleum exploration and development. In petroleum exploration and development, the design of well is frequently deviation from the truth because of the complexity of underground geologic setting and limitation of people′s knowledge at that time. However, in some cases if more attention is paid to the stratigraphic study before drilling big mistake can be avoided. Abundant cases have been found in Qaidam basin during over forty years. Analysis of three exploration wells with incorrect stratigraphic study in Qaidam basin indicates that more attention must be paid to the stratigraphy study. Some advice on how to study statigraphy in petroleum exploration is given.