莺歌海盆地含气储层地震相识别技术完善及应用

Improvement and application of seismic facies identification technology for gas-bearing reservoir in Yinggehai basin

随着莺歌海盆地勘探向中深层高温高压领域的深入,仅用"两红夹一黑"型地震相识别含气储层具有局限性。基于零相位的正极性地震资料,将莺歌海盆地含气储层地震相类型划分成3类,在此基础上从岩性组合、岩石物理特征、砂体耦合等方面对这3类地震相的成因进行了深入分析,归纳出了15种地震相样式,并分析了它们之间的过渡关系,完善了具有普遍性和推广价值的含气储层地震相识别技术。在莺歌海盆地东方13-1区,利用地震相类型成因分析指导地震属性提取,并进行储层平面分布预测,利用地震相类型样式分析指导相控正演模拟,并进行储层纵向分布预测,均取得了较好的应用效果。本文所完善的含气储层地震相识别技术适用于浅海—深海沉积环境以大套泥岩为主夹砂岩的储层,在莺歌海盆地、琼东南盆地、珠江口盆地东部深水区及南海中南部深水区具有广阔的应用前景。

With exploring of Yinggehai basin to mid-deep formation with high temperature and pressure, to identify gas-bearing reservoir only with seismic response of ＂one black in two red＂ has limitation. Based on the positive po- larity zero-phase seismic data, seismic facies of gas-bearing reservoir of Yinggehai basin were classified into 3 types and their causes were analyzed from lithologic association, petrophysical feature and sandbody coupling. Fifteen kinds of seismic facies patterns were summarized and their transition relationships were analyzed, which improved the gas reservoir seismic facies identification technology. Good results were achieved in Dongfang 13-1 area of Yinggehai basin in which seismic attribute extraction and reservoir prediction in the plane were guided by seismic facies cause analysis, and seismic forward modeling constrained with sedimentary facies and reservoir prediction in vertical direction were guided by seismic facies pattern analysis. The improved seismic facies identification technolo- gy for gas-bearing reservoir is applicable to a large set of mudstone sandstone reservoir in shallow--deep sea sedi- mentary environment, which has broad future application in Yinggehai basin, Qiongdongnan basin, deep water ar- ea of eastern Pearl River Mouth basin and south central area of South China Sea.