江苏H地区纵波、转换波联合解释初探

INTEGRATED INTERPRETATION OF P- AND P-SV WAVES IN H AREA OF JIANGSU

地矿部第六物探大队,南京210009

The 6-lh geophysical survey team, MGMR, Nanqjing 210009

在无三分量VSP资料的情况下,主要依据反映构造或岩性特征的同层反射波以及可靠的纵波速度函数,采用时深转换拟合迭代法标定和对比纵波、转换波资料,从而作出纵横渡速度比γ、泊松比б剖面。借助前人的经验公式,理论上建立根据纵横波速度比和泊松比判别岩性与含油气性的关系。结合江苏H地区构造特征和声波测井统计数据进行综合解释,归纳出含气异常的几个基本条件,最后提出一个应引起重视的含气异常。

In case no 3- component VSP data are available, it is necessary to trace and correlate the same events on a P-wave section and its corresponding P-SV wave section based on their structual and lithologic features and then conduct a time-depth conversion using good P - wave velocity functions so as to yield νP/νsratio and poission’s ratio profiles. A dependence curve that relates the velocity ritio of P- and P-SV waves to lithologic characteristics and the property of oil/gas -bearing is given based on an experimented formula built up by predecessors, with which an integrated P- and P-SV wave’s data interpretation was conducted by taking the structual features of H area and the statistics from a sonic ligging into account. As a result, an anomaly inferred to be related to a gas-beosring structure is delineated.