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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 rocks of Y group are important source rocks of X-sag natural gas. Accurately forecasting their distribution is of great significance for scientifically evaluating the prospect of X-sag natural gas exploration. On the basis of fully digesting and assimilating the work of predecessors, aiming at the main problems, through the petrophysical analysis of the coal seams in the well area, it is determined that the logging sequences capable of distinguishing the coal seam from the surrounding rock can be distinguished. Based on the forward modeling study, This paper analyzes geophysical response characteristics of strata and analyzes geophysical characteristics of geologic features of coal strata with the help of attribute analysis and other methods, and analyzes the coal forming environment of depression by comprehensively using such data as core, well logging, geochemistry and paleontology. Coal measures stratigraphic distribution to predict. According to the research, it is considered that the northwest part of X depression is the most favorable development zone of Y coal group strata and is the coal rich area. The seismic attribute analysis technology series represented by multiple attribute regression analysis technique can predict the distribution of thin coal seam combination well law.