缅甸陆上岛弧带火山机构反射特征及分布规律

Seismic reflection feature and distribution of volcanic structures in the middle island arc of onshore Myanmar

综合运用地震、测井和钻井资料,通过井震标定和精细地震解释技术,研究了缅甸陆上中部岛弧带火山机构地震反射特征,划分为火山通道相、火山爆发相、火山侵出相、火山溢流相、火山沉积相等5类地震相,为该区火山机构的识别和划分奠定了基础。利用重磁震联合研究技术,结合高精度地面遥感资料,研究了该区火山发育特征和分布规律,该区火山主要伴随深大断裂的活动范围而发育,具有期次多、分布广和范围大的特点。通过上述研究,共识别了25个火山机构,覆盖面积达3 000 km2,为下一阶段该区火山岩油气藏研究指明了勘探方向。

Well-seismic calibration and meticulous seismic interpretation were applied to study the seismic reflections of the volcanic structures in the middle island arc of onshore Myanmar based on seismic,logging and drilling data. Five types of seismic facies were classified,including volcanic conduit facies,volcanic explosive facies,volcanic extrusive facies,volcanic effusive facies and volcanic sedimentary facies,which were the basis for identification and division of the volcanic structures. The development characteristics and distribution of volcanoes in this area were studied by using gravity-magnetic-seismic techniques and integrating high accuracy remote sensing data. The volcanoes were mainly developed along with the movement of discordogenic fault,characterized by multiple phase and extensive distribution. Based on the above research,we distinguished 25 volcanic structures,covering up to 3 000 km2,manifesting exploration direction for volcanic rock reservoirs in this area.