塔里木盆地南闸组地层对比与沉积相分析  

Strata correlation and sedimentary facies analysis of Nanzha formation,Tarim Basin

作　　者：郭倩[1] 蒲仁海[1] 许璟[1] 田媛媛[1] 樊婷婷[1] 

机构地区：[1]西北大学国家大陆动力重点实验室/地质学系,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2011年第3期491-496,共6页Journal of Northwest University（Natural Science Edition）

基　　金：中国石油化工股份有限公司海相前瞻基金资助项目(YPH08114)

摘　　要：目的统一塔里木盆地南闸组地层划分对比方案,并结合沉积相研究其生烃潜力。方法基于大量岩心分析资料、野外露头观察、薄片鉴定资料及大量测井与录井资源,对南闸组地层进行重新划分,利用单井相、沉积相剖面对比和沉积相平面对比法,对其沉积特征及相带进行划分。结果将隶属于塔里木盆地二叠系底部的阿恰群下碎屑岩段及原南闸组的一套在全盆范围内岩性较稳定的大套泥岩夹灰岩地层统一划分为南闸组;塔里木盆地南闸组主要在自西向东方向的海侵过程中受到陆源供给的影响,盆地西部为深水—半深水陆棚相,塔西南拗陷东部为浅水陆棚相,盆地中西部广大地区为混积滨岸沉积相,塔中以东为滨海—河流相沉积。结论南闸组塔西南深水陆棚相暗色泥岩厚度大于100 m,具有较好的生烃能力,由塔西南拗陷中心—麦盖提斜坡上倾方向,随水体变浅,其热演化程度呈递减趋势。Aim To unify the stratigraphic division of Nanzha formation in Tarim basin, and discuss its hydrocarbon potential combined with sedimentary facies. Methods Based on the analysis of cores, field observation, slice identification and lots of logging data, stratigraphic division of Nanzha formation is unified, sedimentary characteristis of Nanzha formation were analyzed according to the single well facies, profile and plane facies. Results Combined the lower clastic section at bottom of Aqia group in Permian and the stable large set of mudstone with limestone in former Nanzha formation together; it was mainly influenced by continental source supply in the from-west-to-east marine guidance process, the western basin developed deep-half deep water shelf, the eastern part of Taxinan depres- sion developed shallow shelf, the mid-west basin developed mixed integrable shore, and the eastern Tazhong area developed coastal-river facies. Conclusion The thickness of Nanzha formation dark mudstone in southwest basin with deep water shelf facie is thicker than 100 m, which has good ability of hydrocarbon generation, from the southwest depression center-Maigaiti slope dip direction, its thermal evolution was decreasing when the water turned shallow.

关 键 词：塔里木盆地 南闸组 地层划分 沉积相 生烃潜力 

分 类 号：P622.1[天文地球—地质矿产勘探] TE121[天文地球—地质学]