四川盆地威寒1井奥陶系宝塔组天然气勘探发现及其意义  

Natural gas exploration of Ordovician Baota Formation in Well Weihan1 of Sichuan Basin and its significance

作　　者：文龙[1] 罗冰 周刚 张本健 葛冰飞 杨岱林 陶佳丽 田兴旺[1] 马华灵[1] 严威[1] 史甲航 刘常祺 聂美怡 李淑琦 杨振中 孙奕婷 蒋航 宋泽章 Wen Long;Luo Bing;Zhou Gang;Zhang Benjian;Ge Bingfei;Yang Dailin;Tao Jiali;Tian Xingwang;Ma Hualing;Yan Wei;Shi Jiahang;Liu Changqi;Nie Meiyi;Li Shuqi;Yang Zhenzhong;Sun Yiting;Jiang Hang;Song Zezhang(PetroChina Southwest Oil&Gasfield Company,Sichuan Chengdu 610051,China;Research Institute of Exploration and Development,PetroChina Southwest Oil&Gasfield Company,Sichuan Chengdu 610041,China;National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Sichuan Kelite Oil and Gas Technological Service Company Ltd.,Sichuan Chengdu 610041,China)

机构地区：[1]中国石油西南油气田公司,四川成都610051 [2]中国石油西南油气田公司勘探开发研究院,四川成都610041 [3]油气资源与工程全国重点实验室,中国石油大学(北京),北京102249 [4]四川科力特油气技术服务有限公司,四川成都610041

出　　处：《石油学报》2024年第9期1324-1335,共12页Acta Petrolei Sinica

基　　金：国家自然科学基金项目“深层、超深层热液活动及其对古油藏改造效应定量表征”(No.42272161)和“扬子西北缘早古生代海相多幕次构造-沉积转换及其成烃成储响应”(No.U2344209);中国石油西南油气田公司科技项目“四川盆地奥陶系储层展布及成藏条件研究”(2024D101-01-03)资助

摘　　要：2023年11月1日,威寒1井上奥陶统宝塔组获产气量为9.02×10^(4)m^(3)/d,展示出四川盆地奥陶系白云岩岩溶孔隙型储层较大的勘探潜力。以此为契机,基于威远气田上奥陶统宝塔组沉积相、储层岩性和物性等综合分析,研究了宝塔组天然气的特点及展布特征,立足生、储、盖等多方面条件,总结分析了四川盆地威远地区宝塔组的成藏优势。3大古隆起和3期构造运动控制了四川盆地奥陶系的沉积充填特征,盆地内宝塔组高能滩体环绕川中古隆起呈规模展布。宝塔组发育3类储层,即白云岩岩溶型储层、灰岩岩溶型储层和弱白云石化区断溶体,其中,威寒1井宝塔组主要为白云岩岩溶型储层。奥陶系发育两套成藏组合:威远地区是以斜坡背景为主的上组合成藏富集区块,由志留系、五峰组供烃;而威寒1井缺失上覆盖层,生-储-盖组合类型主要为"下生上储",气源均来自寒武系筇竹寺组。威远地区宝塔组经历了"先油后气"的成藏过程,生油高峰期在晚二叠世,生气高峰期在早侏罗世。受潮缘滩体、构造背景和地层控制,威远气区宝塔组潮缘滩发育大型背斜构造背景下的构造-地层复合气藏。On November 1,2023,the gas yield from the Ordovician Baota Formation in Well Weihan1 was 9.02×10^(4)m^(3)/d,demonstrating the great exploration potential of Ordovician dolomite karst porous reservoir in Sichuan Basin.Taking this opportunity,based on comprehensively analyzing the sedimentary facies,reservoir lithology and physical properties of the Upper Ordovician Baota Formation in Weiyuan gas field,the study deeply analyzes the natural gas characteristics and distribution characteristics of Baota Formation.Moreover,the advantageous hydrocarbon accumulation conditions of Baota Formation in Weiyuan area of Sichuan Basin are summarized and analyzed in terms of source,reservoir and cap.Three paleo-uplifts and three stages of tectonic movements controlled the Ordovician sedimentary filling in Sichuan Basin,and large-scale distribution of high energy beaches in Baota Formation around the central uplift of Sichuan Basin.Three types of reservoirs are developed in Baota Formation,i.e.,dolomite karst reservoir,limestone karst reservoir and fault-karst reservoir in weak dolomitization area,among them,Baota Formation in Well Weihan1 is dominated by dolomite karst reservoir.There are two sets of Ordovician accumulation assemblages.Weiyuan area is the upper hydrocarbon accumulation block developed on the slope background,and the source rocks are Silurian and Wufeng Formation.The caprocks are absent in Well Weihan1,the source-reservoir-cap assemblage is mainly characterized by"lower generation and upper reservoir",and the gas source is from the Cambrian Qiongzhusi Formation.Baota Formation in Weiyuan area experienced the process of"oil accumulation followed by gas enrichment".The peak oil generation occurred in Late Permian,and the peak gas generation was in Early Jurassic.Controlled by the peritidal beach body,tectonic setting and strata,the structural-stratigraphic composite gas reservoir in the peritidal beaches of Baota Formation was developed under the background of large anticline structure in Weiyuan gas area.

关 键 词：四川盆地 宝塔组 威寒1井 天然气勘探 碳酸盐岩储层 

分 类 号：TE132.1[石油与天然气工程—油气勘探]