塔北南坡志留系柯坪塔格组沉积体系分析

摘要

运用沉积学原理，通过对岩芯、录井、测井等资料的分析，揭示了塔北南坡志留系柯坪塔格组的沉积体系类型和平面展布规律，为下一步油气藏的预测提供了基础支撑。柯坪塔格组自下而上可分为柯下段和柯上段，柯下段为一套海侵过程中形成的碎屑滨岸—浅海沉积，自西向东依次发育后滨、前滨、临滨和浅海沉积，柯下段底部地层前滨相带砂岩储层占绝对优势，底部砂岩之上覆盖了广泛分布的厚层浅海相泥岩；柯上段主要发育碎屑滨岸沉积，以临滨和前滨沉积为主，后滨发育十分局限，前滨相带砂岩储层分布于北侧—中部—东南部。%Using the theory of sedimentology,based on the analysis of core and logging data,reveals the type of depositional system and plane distribution of Tabei southern slope of Silurian Kalpintag formation and provides a basis for the next prediction of oil and gas reservoirs.The Kalpintag formation of bottom-up can be divided into lower and upper Kalpintag formation.The lower section is clastic shore-shallow sea sediments formed a set of transgressive process,which developed backshore,foreshore,shoreface and shallow sea from west to east.At the bottom of the lower strata,sandstone reservoir of foreshore facies took a great advantage and the widely distributed thick shallow sea facies mudstone covered on the sandstone. The upper Kalpintag formation mainly developed clastic shore deposits and shoreface and foreshore facies took a great advantage and backshore development was very limited.The sandstone reservoir of foreshore facies distributed in north-central-southeast.