四川盆地东部地区中寒武统高台组沉积相及有利区预测  

Sedimentary Facies and Favorable Areas Prediction of the Middle Cambrian Gaotai Formation in the Eastern Sichuan Basin

作　　者：王纪煊 胡忠贵[1,2] 李世临 胡九珍[1,2] 黄宇飞[4] 王文静 曹彭悦 WANG JiXuan;HU ZhongGui;LI ShiLin;HU JiuZhen;HUANG YuFei;WANG WenJing;CAO PengYue(School of Geosciences,Yangtze University,Wuhan 430100,China;Sedimentary Basin Research Center of Yangtze University,Wuhan 430100,China;Chongqing Gas Mine,PetroChina Southwest Oil and Gas Field Company,Chongqing 402160,China;Dongxin Oil Production Plant,SINOPEC Shengli Oilfield Company,Dongying,Shandong 257094,China)

机构地区：[1]长江大学地球科学学院,武汉430100 [2]长江大学沉积盆地研究中心,武汉430100 [3]中国石油西南油气田公司重庆气矿,重庆402160 [4]中国石化胜利油田分公司东辛采油厂,山东东营257094

出　　处：《沉积学报》2024年第5期1670-1684,共15页Acta Sedimentologica Sinica

基　　金：国家科技重大专项(2016ZX05007002)。

摘　　要：【目的】四川盆地油气资源丰富,震旦系灯影组和寒武系龙王庙组的突破,揭示了四川盆地深层油气资源的巨大勘探潜力。四川盆地东部地区寒武系高台组研究和勘探程度总体较低,开展高台组层序地层、沉积相特征及分布等基础地质研究可以为下一步油气勘探部署提供依据。【方法】综合利用钻井、测井、露头剖面、岩心和地震等资料,对川东地区寒武系高台组层序—岩相古地理开展综合研究。【结果】高台组自下而上划分为3个三级层序(SQ1~SQ3),6个四级层序(SSQ1~SSQ6),高台组沉积时期主要发育碳酸盐岩局限台地沉积环境,自西向东依次发育混积潮坪、潮坪、潟湖、台内滩等四种沉积亚相;高台组发育粉晶白云岩储集层,厚度较薄,储集层的非均质性较强,总体上呈“中—低孔低渗”的特征。【结论】受后期构造活动和热液影响,研究区有利储层位于背斜展布区域,川东西部的潮坪亚相(云坪微相)为有利的勘探区带。[Objective]The Sichuan Basin has abundant oil and gas resources.The breakthrough of the Sinian Dengying and Cambrian Longwangmiao Formations reveals the huge exploration potential of deep oil and gas resources in the Sichuan Basin.However,the extent of research and exploration of the Cambrian Gaotai Formation in the eastern Sichuan Basin is typically low.Research between stratigraphy and sedimentary facies characteristics of the Gaotai Formation can provide a basis for the next step of oil and gas exploration and deployment.[Methods]The basic geological research on the sequence stratigraphy,sedimentary facies characteristics,and distribution of the Gaotai Formation can provide the basis for future oil and gas exploration and deployment.Based on drilling,logging,outcrop profile,core,and seismic data,a comprehensive study on the sequence lithofacies paleogeo.graphy of the Cambrian Gaotai Formation in eastern Sichuan has been conducted.[Results]The results show that Gaotai Formation can be divided into three third-order sequences(SQ1-SQ3)and six fourth-order sequences(SSQ1-SSQ6).During the sedimentary period of Gaotai Formation,the carbonate restricted platform sedimentary environment was developed.From west to east,four sedimentary subfacies developed successively:mixed tidal flat,tidal flat,lagoon and inner platform beach.The Gaotai Formation developed with a silty dolomite reservoir,which is characterized by thin thickness,strong heterogeneity,and"medium-low porosity and low permeability".[Conclusions]The favourable reservoirs in the study area are located in the dorsal spreading area influenced by tectonic activity and hydrothermal fluids.Tidal flat subfacie(dolomite tidal flat microfacies)is a favourable exploration zone in the western of eastern Sichuan Basin.

关 键 词：四川盆地东部 寒武系高台组 层序地层 沉积特征 沉积演化 

分 类 号：P512.2[天文地球—地质学]