CAJ | 학술논문

四川盆地上三叠统须家河组油气勘探开始于20世纪40年代，其中须二段、须四段、须六段是主要勘探目的层段，也是盆地周边地区寻找新气源最有利层位之一。根据钻井岩心观察、野外剖面实测和室内镜下岩石薄片鉴定分析，并结合岩石学、测井及地震等沉积相标志研究，确定大川中地区须家河组主要发育扇三角洲、辫状河三角洲和湖泊等沉积相带，进一步划分出若干亚相和微相。利用高分辨率层序地层学理论和技术，在须家河组识别出2个超长期和5个长期基准面旋回层序。以沉积学理论为指导，选择各长期旋回层序为等时地层单元编制四川盆地层序-岩相古地理图。编图结果表明，须家河组5个长期岩相古地理沉降中心、迁移方向和沉积相带的展布严格受龙门山和米仓山-大巴山两造山带非同步的构造格局控制。
사천분지상삼첩통수가하조유기감탐개시우20세기40년대，기중수이단、수사단、수륙단시주요감탐목적층단，야시분지주변지구심조신기원최유리층위지일。근거찬정암심관찰、야외부면실측화실내경하암석박편감정분석，병결합암석학、측정급지진등침적상표지연구，학정대천중지구수가하조주요발육선삼각주、변상하삼각주화호박등침적상대，진일보화분출약간아상화미상。이용고분변솔층서지층학이론화기술，재수가하조식별출2개초장기화5개장기기준면선회층서。이침적학이론위지도，선택각장기선회층서위등시지층단원편제사천분지층서-암상고지리도。편도결과표명，수가하조5개장기암상고지리침강중심、천이방향화침적상대적전포엄격수룡문산화미창산-대파산량조산대비동보적구조격국공제。
The oil and gas exploration began in the 1940s in the Xujiahe Formation,Upper Triassic,Sichuan Basin,of which the second,the fourth and the sixth members are not only main aim strata,but also one of the most favorable horizons in search for new gas sources.According to core of drilling observation,the actual measurement of field section,the identification and analysis of microscope thin sections,and combined the research of sedimentary facies marks with petrology,well logging and seismology,it is indicated that fan delta, braid river delta and lakes are developed in the Xujiahe Formation,large-scale Central Sichuan,and further are divided into several subfacies and microfacies.Through the theory and technology of high resolution sequence stratigraphy,we identify two super long-terms and five long-terms of datum base-level cycles sequences in the Xujiahe Formation.Using the sedimentary theory as a guidance,we choose the long-term base-level cycle se-quences as isochronal stratigraphic units to map sequence-lithofacies paleogeography of Sichuan basin.The re-sult of maping diagram makes it clear that five long-term lithofacies-paleogeographic subsidence center,migra-tion direction and the distribution rule of sedimentary facies are strictly controlled by the Longmen orogenic belt and Micang Mountains with the nonsynchronous tectonic framework.