北三台凸起石炭系火山岩地震响应及分布规律

SEISMIC RESPONSE FEATURE AND DISTRIBUTION LAW OF CARBONIFEROUS VOLCANIC ROCK IN BEISANTAI UPLIFT

火山岩是北三台凸起石炭系主要储集层,从下向上可划分出3个火山序列,利用合成地震记录标定技术可建立井下火山岩相与井旁地震响应特征之间的对应关系,借助三维地震资料对各个火山序列界面进行地震对比解释,然后对每个火山序列进行地震相划分,共识别出5种主要地震相。根据单井相标定关系可将地震相转换为火山岩相,从而再现了研究区石炭系火山岩相的分布特征。综合石炭系顶部遭受剥蚀程度、断裂发育、火山岩岩相分布特征、石炭系上覆盖层发育程度、井下油气显示情况和与生烃凹陷的距离等因素,确定出北三台凸起石炭系火山岩油气勘探有利区带。

Volcanic rock is the main reservoir of the Carboniferous System in Beisantai uplift area.There are three vocanic cycles through the identification of volcanic phase in the well and the classification of volcanic cycle.The correspondence relationship between vocanic phase in the well and seismic responce feature adjacent the well can be determined through composite seismogram demarcation technique.Through the seismic interpretation of volcanic cycle interfaces by using 3D seismic data and the classification of seismic phase of volcanic cycles,five main seismic phases can be identified.The seismic phase can be transformed into volcanic phase according to single well phase demarcation relationship,so that the distributary feature of carboneferous igneous rocks is reconstructed.Through the synthesis of some elements,which are the denudation degree of the upper Carboniferous system,the development of the faults,the distribution feature of the volcanic phase,the development of cap rock on Carboniferous system,the display of oil and gas in the well and the distance with hydrocarbon generation sunken,favorable area of oil and gas exploration in Carboniferous system volcanic rocks in Beisantai uplift can be confirmed.