陆相湖盆陡坡带砂砾岩扇体的沉积模式及地震识别

Depositional mode and seismic recognition of sandstone and conglomerate fan bodies in the abrupt slope zone of terrestrial facies lake basin

胜利石油管理局物探研究所, 东营 257100

Research Institute of Geophysical Prospecting, Shengli Petroleum Administration, Dongying 257100

砂砾岩扇体是一种重要的油气勘探目标。本文利用地震资料建立了各种扇体的沉积模式和地震识别模式, 根据外形特征和内部反射结构可以直接识别扇体。砂砾岩体从发育位置上可以分为湖屋型、阶地型和断崖型三类；从成因上也可分为近岸水下扇、扇三角洲和水下油积扇三种类型。同时利用等时水平切片可以研究凸起的起伏形态即沟谷的发育情况及水系分布, 预测砂砾岩体的发育位置和展布规律, 并指出了沟一扇之间的关系。

The sandstone and conglomerate fan body is a kind of important target of oil and gasexploration. In the paper, we use seismic data to build the depositional mode and seismicrecognition mode of various fan bodies. The fan bodies can be recognized directly through theexternal form characteristic and the internal reflection structure-The sandstone and conglomeraterock mass can be classified as lake scarp type, terrace type and fault scarp type in terms ofdevelopmental position and can be classified as nearshore underwater fan, fan delta, andunderwater turbidite fan in terms of genesis. Meanwhi1e, the isochronous horizontal slice can beused to study the relief shape of embossment, predict the developmental position and the arealextent of sandstone and cong1omerate rock mass, and point out the relation between the trenchand the fan.