利用地震地质资料综合研究X凹陷煤系地层分布

An Integrated Study on Coal Measure Distribution in X Sag Based on Seismic and Geologic Data

Y组的煤系源岩是X凹陷天然气的重要源岩,准确预测其分布对于科学地评价X凹陷天然气勘探前景具有重要意义。在充分消化吸收前人工作成果的基础上,针对存在的主要问题,通过对井区煤层组进行岩石物理分析,确定能区分煤层与围岩的测井序列,从正演模拟研究出发,对煤系地层的地球物理响应特征进行分析,结合属性分析等技术手段,进行煤系地层地质特征的地球物理识别,综合运用岩心、测井、地球化学、古生物等资料,分析凹陷的成煤环境,对煤系地层的分布进行预测。经研究,认为X凹陷的西北部是Y组煤系地层最有利发育区,为富煤区所在,以多属性回归分析技术为代表的地震属性分析技术系列可以较好地预测薄煤层组合的分布规律。

The coal measure source rock in Y Formation is one of the important source rocks in X sag,the distribution of which is critical in assessing exploration prospect of X sag.Based on previous work,our study aimed at principal problems to analyze the petrophysical characteristics of the coal bed.The logging series that could be used to separate the coal bed from the wall rock was defined with forward modeling.The geophysical response of coal measure was analyzed by combining with seismic attribute analysis.In addition,the geological characteristics of the coal measure was recognized through the geophysics characteristics by integrating the core,well log,geochemical and palaeontology data to analyze the coal forming environment in the sag and the distribution of coal measure.The northwest of X sag is believed as the favorable areas that developed the coal measure in Y Formation and rich in coals.The analysis technique of seismic attribute represented by multiple-attribute regression is suitable for the prediction of the coal measure distribution.