二连盆地辫状河三角洲沉积特征及含油性

为了建立二连断陷湖盆辫状河三角洲沉积相模型 ,确定油气勘探领域 ,根据二连盆地吉尔嘎朗图等 30个凹陷的钻井岩性剖面、地震剖面、沉积构造、电性特征、测试结果和油气显示等资料 ,研究了断陷湖盆缓岸的大中型砂砾岩体的形成条件、储层微相特征和含油性 ,建立了相模式 .结果表明 :这类砂体属辫状河三角洲成因 ,发育辫状河三角洲平原等三个亚相、8个微相 ,存在以牵引流成因为主的沉积构造 .它的前缘水道和分支坝具有良好的储集性能和成油条件 ,是本区油气勘探的主要方向

Depositional Feature and Oil-bearing Feature of the Braided River Delta in Erlian Basin

The generation condition, reservoir microfacies and oil bearing feature of the large and medium sized glutenite bodies in the gentle bank of Erlian rife lake basin were studied on the basis of the data of the lithologic section, seismic section, sedimentary structure, sedimentary rhythm, electric characteristic, tested results and oil and gas shows of thirty sags in the basin. The facies model of the deposit was established. The study result shows that the type of the sand bodies is braided river deltaic genesis, the deposition of tractional current genesis is dominant, and there are three subfacies and eight microfacies. It is known that the frontal channel and wadge sand of the deltaic deposition have good oil generating condition and oil storage feature, and they are the targets of oil and gas exploration in the area.