四川盆地南部地区上二叠统长兴组沉积微相研究  

Sedimentary Microfacies Characterization of Upper Permian Changxing Formation in Southern Sichuan Basin

作　　者：李明隆 谭秀成 李延钧 江林 胡丽 Li Minglong;Tan Xiucheng;Li Yanjun;Jiang Lin;Hu Li(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum University),Chengdu,Sichuan 610500,China;Southwest Petroleum University Division of CNPC Key Laboratory of Carbonate Reservoirs,Chengdu,Sichuan 610500,China;Chengdu Chuangyuan Oil and Gas Technology Development Co.,Ltd.,Chengdu,Sichuan 610500,China;PetroChina Southwest Oil&Gas field Company,Luzhou,Sichuan 646000,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油集团碳酸盐岩储层重点实验室西南石油大学研究分室,四川成都610500 [3]成都创源油气技术开发有限公司,四川成都610500 [4]中国石油西南油气田分公司,四川泸州646000

出　　处：《特种油气藏》2020年第3期66-73,共8页Special Oil & Gas Reservoirs

基　　金：国家油气重大专项“微生物碳酸盐岩特征、成因及规模成储机制研究”(2016ZX05004002-001)。

摘　　要：针对四川盆地南部(蜀南)地区上二叠统长兴组台内礁滩分布认识不清的问题,结合四川盆地晚二叠世长兴期区域沉积背景,对蜀南地区上二叠统长兴组的岩石类型、测井响应等沉积相标志进行了详细研究,探讨了蜀南地区长兴组沉积微相特征及分布规律。结果表明:晚二叠世长兴期蜀南地区为连陆碳酸盐岩台地沉积体系,分为半局限台地相与潮控滨岸相,包括台内滩(礁)、半局限潟湖、碎屑潮坪3个亚相,岩性以颗粒灰岩、礁灰岩、生屑泥晶灰岩、含生屑泥晶灰岩、泥晶灰岩与碎屑岩-混积岩为主。纵向上,长兴组由2个完整的海侵-海退沉积旋回构成,海侵半旋回以潟湖沉积为主,海退半旋回以台内滩(礁)沉积为主。其中,台内滩亚相根据不同的岩性、滩体厚度等可划分虫屑灰岩微相(滩核)、藻屑灰岩微相(滩翼)以及滩间3个微相。平面上,长兴组一、二段的沉积相带展布具有继承性,较长一段而言,长二段沉积时滩体的沉积范围、规模均明显扩大,并具有向南、东迁移的趋势。高能相带的物性参数相对较好,为油气勘探的有利相带。研究结果对深化该区储层分布研究具有一定的指导意义。The regional sedimentary setting of the Late Permian Changxing Formation in the Sichuan Basin was combined to clarify the inner reef-flat distribution within the Upper Permian Changxing Formation in the southern Sichuan Basin(Southern Sichuan Basin).The rock categories,logging response and other sedimentary facies markers of the Upper Permian Changxing Formation in the Southern Sichuan Basin were researched to discuss the features and distribution patterns of Changxing Formation in the Southern Sichuan Basin.Research indicates that the southern Sichuan Basin is considered as a continuous continental carbonate platform sedimentary system in the Later Permian Changxing period,which can be divided into semi-limited platform and tidal-controlled coastal facies.It consists of three subfacies,including inner platform beach(reef),semi-limited lagoon and detrital tidal flat.The lithology is dominated by granular limestone,reef limestone,bioclastic micrite limestone,bioclastic micrite limestone,micrite limestone and clastic-peperite.Longitudinally,the Changxing Formation consists of two complete transgression-regression sedimentary cycles.The transgression semi-cycle is dominated by lagoon deposition,and the semi-regression semi-cycle is dominated by platform sediment(reef)deposition.The inner beach subfacies can be divided into three microfacies according to lithology and beach body thickness,including insect debris limestone microfacies(beach core),algal debris limestone microfacies(beach wing)and inter-beach subfacies.Laterally,the sedimentary facies distributions of Changxing1 and Changxing2 members are featured by inheritance.Comparing with the Changxing1 member,the Changxing2 Member shows a larger shoal body deposition range and scale and a tends to migrate southward and eastward.High-energy facies zone indicates relatively favorable physical properties,which are considered as favorable facies zones for hydrocarbon exploration.This research could provide certain guidance for the further understanding of reservoir di

关 键 词：沉积微相 颗粒滩 沉积演化 储层分布 长兴组 蜀南地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探]