塔河油田南部石炭系卡拉沙依组沉积相研究

综合应用沉积学、古生物学、地球化学等多学科理论，通过岩心观察描述，结合测井、录井、古生物、地球化学等资料综合分析认为:塔河油田南部石炭系卡拉沙依组上部砂泥岩段砂岩中发育羽状交错层理、波状层理、透镜状层理，砂泥岩薄互层，低砂地比，半咸水生物或广盐度生物大量发育，反映了一种潮坪环境；平面上，研究区北部偏粗、含砾，反映存在河流注入，为具有河口湾性质的潮坪沉积体系，卡拉沙依组砂泥岩段主要处于潮间带，发育潮道、砂坪、砂泥混合坪、泥坪、河口坝等微相。下部的上泥岩段为深灰色、灰褐色、棕褐色泥岩，偶夹薄层泥质粉砂岩、灰质泥岩条带，发育平行层理，为泻湖相沉积。

Study on Sedimentary Facies of Carboniferous Kalashayi Formation in the South of Tahe Oilfield

Based on the sedimentology, palaeontology and geochemistry, the sedimentary system of tidal flat lagoon were developed in the Carboniferous Kalashayi Formation in the south of Tahe oilfield from the studies of cores, well logs, palaeontology and geochemistry. The upper sand shale section of the Kalashayi Formation developed feathering crossbedding, wave bedding, lensing bedding, thin sand and mudstone interaction layers, low ration of sand to strata ,brackish water or vast salinity creatures, all of them reflect an environment of tidal flat. In plane, the sand of the north of region of interest is coarser and contains gravels, that reflects there are rivers filling in. So this is a sedimentary system of tidal flat which has a nature of estuary. The Kalashayi Formation sand shale section was in intertidal zone, including tidal channel, sand flat, sand mud mixed flat, mouth bar microfacies. Up mudstone section includes dark grey, grey brown and brown mudstone which occasionally contains thin pelitic siltstone，calcareous mudstone belt, developed parallel bedding, it is lagoonal facies. Finally, the sedimentary model of tidal flat with estuary has been established.