四川超级含气盆地古生界大中型气田分布规律及其主控因素  

Distribution pattern and main controlling factors of Paleozoic giant-and medium-sized gas fields of the Sichuan super gas basin in Southwest China

作　　者：邓宾[1] 刘树根[1] 姚根顺 廖芸 张本健[3] 张航[3] 孙玮[1] 吴娟[1] 刘文平[3] 吴伟[3] 李文正 鲁鹏达 王恒 刘重江 张智南 DENG Bin;LIU Shugen;YAO Genshun;LIAO Yun;ZHANG Benjian;ZHANG Hang;SUN Wei;WU Juan;LIU Wenping;WU Wei;LI Wenzheng;LU Pengda;WANG Heng;LIU Chongjiang;ZHANG Zhinan(College of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China;PetroChina Hangzhou Research Insitute of Geology,Hangzhou,Zhejiang 310023,China;PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China)

机构地区：[1]成都理工大学能源学院 [2]中国石油杭州地质研究院 [3]中国石油西南油气田公司

出　　处：《天然气工业》2024年第7期54-76,共23页Natural Gas Industry

基　　金：国家自然科学基金项目“海相深层油气富集机理与关键工程技术基础研究”(编号:U19B6003)。

摘　　要：四川盆地是中国天然气资源最为富集的超级含气盆地,但天然气探明程度目前仍然偏低。为了给下一步天然气勘探提供理论支撑,基于该盆地典型气田勘探历程,结合多期构造演化与含油气系统分析,探讨了四川盆地古生界大中型气田富集分布规律及其主控因素,揭示了该盆地巨大的天然气勘探潜力。研究结果表明:①四川盆地古生界蕴含3个超级含油气系统,即下寒武统筇竹寺组(探明储量占该盆地天然气总探明储量的17.55%)、上奥陶统五峰组—下志留统龙马溪组(探明储量占该盆地天然气总探明储量的41.30%)、上二叠统龙潭组/吴家坪组(探明储量占该盆地天然气总探明储量的12.53%);②该盆地古生界已发现20个超大型气田(天然气探明储量超过1000×10^(8)m^(3)),14个大型气田(天然气探明储量介于300×10^(8)~1000×10^(8)m^(3))以及20个中型气田(天然气探明储量介于100×10^(8)~300×10^(8)m^(3)),超大型气田探明储量占该盆地天然气总探明储量的85.5%;③古生界大型隆—坳格局构造沉积分异作用控制影响着该盆地内筇竹寺组、五峰组—龙马溪组和龙潭组/吴家坪组3套优质烃源岩层系的形成与分布。结论认为,晚三叠世以来的陆相盆地演化过程使得中晚三叠世—早中侏罗世成为上述3个超级含油气系统的关键成藏期,形成了3个气田群(绵阳—长宁拉张槽周缘带震旦系—下古生界、开江—梁平与蓬溪—武胜拉张槽周缘带二叠系—三叠系、川东南五峰组—龙马溪组页岩气),其合计天然气储量均超过1×10^(12)m^(3),是该盆地天然气勘探的有利区带。Sichuan Basin is the super gas basin with the most abundant natural gas resources in China,but the exploration degree of natural gas is relatively low.For providing theoretical support of the next exploration,combined with the exploration history of typical gas fields in the Sichuan Basin,and the analysis of oil-gas systems and multi-stage structural evolution,we analyze the enrichment and distribution and main control factors of large sized gas fields in the Paleozoic in the Sichuan Basin,which reveals the huge exploration potential of natural gas resources in the Sichuan Basin.Results show that the Sichuan Basin contains three super petroleum systems:the Lower Cambrian Qiongzhusi Formation,the Wufeng Formation-Longmaxi Formation,and the Upper Permian Longtan Formation/Wujiaping Formation,and their demonstrated reserves account for 17.55%,41.30%and 12.53%of the total demonstrated reserves in the Sichuan Basin respectively.20 giant-sized gas fields(The proven in-place gas reserves of natural gas exceed 1000×10^(8)m^(3)),14 large-sized gas fields(The proven in-place gas reserves of natural gas range from 300×10^(8)m^(3)-1000×10^(8)m^(3))and 20 medium-sized gas fields(The proven in-place gas reserves of natural gas range from 100×10^(8)m^(3)-300×10^(8)m^(3))have been discovered in the basin.The demonstrated reserves of natural gas in the giant-sized gas fields account for 85.5%of the total proven in-place gas reserves.The tectonic and sedimentary differentiation of the Paleozoic large-scale uplift-depression pattern controls the sedimentary characteristics of three sets of high-quality source rocks in the Sichuan Basin(Qiongzhusi Formation、Wufeng-Longmaxi Formation and Longtan/Wujiaping Formation).The conclusion is that the evolution of continental basins since the Late Triassic,the Middle-Late Triassic to the Early-Middle Jurassic is the key reservoir forming period for the three major super petroleum systems.The Sinian to Lower Paleozoic around the Mianyang-Changning intracratonic sags,the Permian-Triassic

关 键 词：四川盆地 超级含气盆地 超级含油气系统 超大型气田 大中型气田 海相天然气 页岩气 

分 类 号：TE132.2[石油与天然气工程—油气勘探]