马路背地区主要“通天”断层垂向封闭性评价

EVALUATION ON VERTICAL SEALING CAPACITY OF THE MAIN THROUGH FAULTS, MALUBEI AREA

基于钻井录井、分析化验、地震解释等资料,对马路背地区F1、F2、F3 3条通天断层(向上延伸至地表)的发育特征进行了认识。在此基础上,利用断裂带填充物泥质含量和断面压力两个参数,建立相关的评价标准,对其现今垂向封闭性开展综合评价。评价结果认为:F1、F2断层垂向封闭性不理想,对Mj构造天然气保存条件具有一定程度的破坏;F3断层垂向封闭性良好,利于M1-1构造天然气的聚集和保存。评价结果与实际勘探情况较符合,评价方法在研究区取得了良好的应用效果。

Based on some data from drilling, mud logging, analysis and experiment, and seismic interpretation, the development characteristics of three through faults in Malubei area, including F1, F2 and F3(extending upward to surface), were studied. Moreover, many corresponding evaluation criterions were established by two parameters of both shale content and fault-surface pressure, and further a comprehensive assessment on the vertical sealing capacity was implement for these three faults. Results show that(1)for F1 and F2 faults, the vertical sealing capacity is poor, resulting in a certain destructive effect on preservation conditions for natural gas in MJ structure; and(2)for F3 fault, the vertical sealing capacity is better, which is conducive to gas accumulation and preservation in M1-1 structure. Evaluated results are coincident with actual exploration, and after an application of evaluation methods to this study area, the effect was also very well.