川中二叠系长兴组层序格架内台内滩沉积构型与分布规律  

Sedimentary architecture and distribution of intra-platform shoal in sequence framework of Permian Changxing Formation in central Sichuan Basin,SW China

作　　者：王东 刘宏[2,3] 唐松[4] 白金昊 周刚[5] 李正勇 梁锋 谭秀成[1,3] 耿超 杨应[1,2] WANG Dong;LIU Hong;TANG Song;BAI Jinhao;ZHOU Gang;LI Zhengyong;LIANG Feng;TAN Xiucheng;GENG Chao;YANG Ying(State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Southwest Petroleum University,Chengdu 610500,China;Sichuan Natural Gas Geology Key Laboratory,Southwest Petroleum University,Chengdu 610500,China;Southwest Petroleum University,Division of Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500,China;Central Sichuan Oil and Gas District,PetroChina Southwest Oilfield Company,Suining 629000;Research Institute of Petroleum Exploration and Development,PetroChina Southwest Oilfield Company,Chengdu 610041,China;Gas Production Administrative Department of Northern Central Sichuan Gas District,PetroChina Southwest Oilfield Company,Suining 629000,China;Southern Sichuan Gas District,PetroChina Southwest Oilfield Company,Luzhou 646000,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]西南石油大学天然气地质四川省重点实验室,成都610500 [3]中国石油碳酸盐岩储层重点实验室西南石油大学研究分室,成都610500 [4]中国石油西南油气田公司川中油气矿,四川遂宁629000 [5]中国石油西南油气田公司勘探开发研究院,成都610041 [6]中国石油西南油气田公司川中北部采气管理处,四川遂宁629000 [7]中国石油西南油气田公司蜀南气矿,四川泸州646000

出　　处：《石油勘探与开发》2023年第2期346-359,共14页Petroleum Exploration and Development

基　　金：中国石油-西南石油大学创新联合体科技合作项目(2020CX010000)。

摘　　要：基于岩心、薄片、测录井及地震资料的综合分析,开展川中二叠系长兴组层序识别与对比,明确台内滩的典型沉积构型,系统研究各层序台内滩的纵横向发育规律,进而建立滩体的沉积演化模式。研究表明:(1)川中地区长兴组发育两个完整三级层序,SQ1层序整体为北厚南薄,SQ2层序呈“两厚三薄”的厚度分布特征。(2)川中地区长兴组发育台内滩、滩间海和台内洼地亚相,台内滩在垂向上主要发育稳定叠加型和高频互层型两种典型沉积序列。(3)台洼边缘滩带发育稳定叠加型沉积序列,由两个成滩期构成,分别位于SQ1和SQ2层序的高位域;台洼南侧滩带发育高频互层型沉积序列,由4个成滩期构成,主要位于SQ2层序的高位域。(4)SQ1层序沉积时期,台内滩主要发育在研究区北侧的台洼边缘,南侧整体为滩间海亚相;SQ2层序沉积时期,台内滩在区内广泛沉积,形成两个近于平行的台内滩带。研究结果为川中地区长兴组台内滩勘探提供了方向和思路。Based on the comprehensive analysis of core,thin section,logging and seismic data,this study carried out the identification and comparison of Permian Changxing Formation sequences,clarified the typical sedimentary architectures of intra-platform shoal,investigated the vertical and horizontal development and distribution of intra-platform shoal in each sequence,and thus established the sedimentary evolution model of shoal body.The study results are reflected in four aspects.First,there are two complete third-order sequences(SQ1and SQ2)in Changxing Formation in central Sichuan Basin.SQ1 is generally thick in the north and thin in the south,and SQ2 shows a thickness differentiation trend of“two thicknesses and three thinnesses”.Second,the Changxing Formation in central Sichuan Basin mainly develops intra-platform shoal,inter-shoal sea and intra-platform depression subfacies.In the vertical direction,the intra-platform shoal mainly presents two typical sedimentary sequences:stable superposed and high-frequency interbedded.Third,the stable superimposed sedimentary sequence is developed in the shoal belt at the edge of intra-platform depression,which is composed of two shoal-forming periods and located in the highstand systems tracts(HSTs)of SQ1 and SQ2.The high-frequency interbedded sedimentary sequence is developed in the southern shoal belt of intra-platform depression,which is composed of four shoal-forming periods and mainly located in the HST of SQ2.Fourth,during the SQ1 deposition,the intra-platform shoal was mainly developed at the edge of the intra-platform depression on the north side of the study area,and the inter-shoal sea subfacies was mainly developed on the south side.During the SQ2 deposition,the intra-platform shoal was widely developed in the area,forming two nearly parallel intra-platform shoal belts.The study results provide direction and ideas for exploration of Changxing Formation intra-platform shoal reservoirs in central Sichuan Basin.

关 键 词：四川盆地 二叠系长兴组 台内滩 层序地层格架 典型沉积序列 沉积演化模式 

分 类 号：TE121.1[石油与天然气工程—油气勘探]