湖相浊积砂体沉积特征及油气勘探意义

Sedimentary characteristics of lacustrine turbidite sand body and its significance on petroleum exploration

在中国众多陆相含油气盆地中广泛发育浊积砂体,且其早已成为油气勘探的重要领域。根据浊积砂体在层序地层中所处的位置、沉积相带、沉积物组合及平面展布特征等的差异,可将其归纳为近岸浊积扇、远岸浊积扇、三角洲前缘滑塌浊积岩和深水型透镜状浊积岩4种类型,并分析了各自的沉积特征。综合研究表明,良好的储集砂体位于近岸浊积扇的中扇辫状水道、中扇叠置扇叶和远岸浊积扇的中扇水道以及三角洲前缘滑塌浊积岩中,而透镜状浊积砂体储集性能较差。

There are a lot of turbidite sand bodies in numerous continental petroliferous basins in China,and they have already become the important field of oil and gas exploration. According to the difference of the position of the turbidite sand bodies in the sequence stratigraphy,the sedimentary facies belt,sediment combination and plane spread character, etc, the turbidite sand bodies can be divided into four types: inshore turbidite fan,in fralittoral turbidite fan, fluxie fan of delta front and lenticular turbidite, and their sedimentary characteristics are analyzed. The comprehensive research presents that good sandstone reservoir lies in braided channel and superimposed fan of middle fan in the inshore tubidite fan, middle fan channel of the infralit-toral turbidite fan and fluxie fan of delta front except for lenticular turbidite sand bodies.