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摘要: 恩平凹陷恩平组下段现今埋深超过3 800 m，处于中成岩B期，客观评价恩平组下段的勘探潜力及有利目标是深入勘探的重要前提。通过大量铸体薄片、普通薄片、扫描电镜等分析，划分了恩平凹陷恩平组的成岩序列，找出了影响储层物性的主控成岩作用，认为压实作用是孔喉衰减的主导因素，有机酸性流体溶蚀作用是孔隙度局部回升的主要原因。根据恩平凹陷埋藏史、地热史、成岩过程分析建立了恩平组的孔隙度演化模式，在关键时期恩平组下段处于中成岩A期的晚期，该时期的古孔隙度平均值约10%，孔喉已经比较细小，不利于酸性流体的改造和油气的大量充注。在上述工作的基础上，运用沉积相、成岩相结合的方法对恩平组下段储层进行了动态评价，处于凹陷南斜坡的PY1451井附近地区压实较弱，物性较好，是油气运聚的有利区带，其它地区成岩强度较高，只能作为天然气勘探的目标。Abstract: The depth of the lower part of Enping Fm., Enping Sag is over 3 800 meters now, and the intensity of diagenesis is at the B period of middle diagenetic stage. Of course, it is a basic task that the lower part of the Enping Fm. is assessed objectively. Based on the numerous observations on thin sections and SEM analyses, the diagenetic sequences of Enping Formation, Enping Sag has been created. Also, we have found out the main controlling diageneses that affect the reservoir property strongly: first, compaction is the key factor that results in the reduction of porosity; second, the denudation of the acid fluid is the main reason that causes the enhancement of porosity partly.
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