塔中顺托果勒地区志留系柯坪塔格组下段沉积相

Sedimentary Facies of Silurian Kepingtage Lower Member in Shuntuoguole Area, Middle Tarim Basin

通过对塔里木盆地顺托果勒地区中南部志留系柯坪塔格组钻井、测井、岩心化验分析资料的综合分析,认为柯坪塔格组中—下段地层并未缺失,并从沉积相等多方面的特征标志论证了柯坪塔格组下段的存在。柯坪塔格组下段主要发育受波浪控制的滨岸相和受潮汐控制的滨岸相两种沉积体系,由此识别出临滨、潮间和潮下亚相和相关的微相。建立了柯坪塔格组下段缓坡型滨岸沉积模式。认为海侵背景下的滨岸砂坝体为最有利的储集砂体。

According to the comprehensive analysis of the well logging and cores and available data, it is indicated that the Middle to Lower Members of Silurian Kepingtage Formation is not lacked as the previous viewpoint in the central and southern parts of Shuntuoguole, Tarim basin. The Lower Member of Kepingtage Formation is proved to exist by the characteristic marks of sedimentary facies. Two kinds of sedimentary facies, the wave-controlled shore and the tidecontrolled shore facies, develop in the Lower Member. And therefore, the shoreface, intertidal and subtidal subfacies and the associate microfacies are recognized. A gentle-slope shore sedimentation model is set up for Lower Member of Kepingtage Fm.. It is suggested that the shore facies sandstone barrier that deposited during transgression is the most favorable reservoir.