德阳-武胜海槽长兴组礁滩沉积及储源特征研究  

Study on characteristics of reef shoal deposition and reservoir source of Changxing Formation in Deyang-Wusheng trough, Sichuan Basin

作　　者：王嘉先 孙豪飞 徐亮[1] 明盈 徐唱 冉钰 李长志[2] 李阳[3] 杨容 WANG Jiaxian;SUN Haofei;XU Liang;MING Ying;XU Chang;RAN Yu;LI Changzhi;LI Yang;YANG Rong(Research Institute of Exploration and Development,Southwest Oil and Gas Field Company,PetroChina,Chengdu 610041,China;College of Earth and Planetary Sciences,Chengdu University of Technology,Chengdu 610059,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油天然气股份有限公司西南油气田分公司勘探开发研究院,四川成都610041 [2]成都理工大学地球与行星科学学院,四川成都610059 [3]西南石油大学地球科学与技术学院,四川成都610500

出　　处：《断块油气田》2025年第2期242-250,共9页Fault-Block Oil & Gas Field

基　　金：四川省自然科学基金项目“不同成因固体沥青微观结构差异性研究”(2024NSFSC0813)。

摘　　要：四川盆地长兴组生物礁滩表现出巨大的油气探勘价值,但随着开江-梁平海槽台缘带礁滩气藏研究的不断深入,同一区域新的礁滩气藏发现难度逐渐递增。为寻找礁滩新领域与新目标,基于野外露头、钻井岩心资料,对德阳-武胜海槽长兴组沉积、烃源岩以及储层特征进行研究。结果表明:1)德阳-武胜海槽两侧台缘在长兴期以生屑灰岩沉积为主,形成礁滩储层。海槽内部以深水硅质泥岩沉积为主,形成优质烃源岩。在长兴组中晚期礁滩规模最大,并向海槽方向逐渐迁移、消失。2)德阳-武胜海槽长兴组最主要的储集岩类型为生屑灰岩,储集空间主要为晶间(溶)孔,储层物性表明长兴组礁滩储层属于中高孔低渗类型储层。3)长兴组内部以及下伏地层发育多套优质烃源岩,其中龙潭组泥质烃源岩平均TOC最高。多套烃源岩与礁滩储层形成了“旁生-侧储”和“下生-上储”的储源配置。建议将环海槽的台缘高带作为重点油气勘探区域,并主要在长兴组中晚期地层寻找礁滩储层。Changxing Formation in Sichuan Basin has shown great vaule for oil and gas exploration,but with the continuous deepening of research on reef shoal gas reservoirs in the platform margin zone of Kaijiang Liangping trough,the difficulty of discovering new reef shoal gas reservoirs in the same region is gradually increasing.In order to search for new fields and targets of reef shoals,based on field outcrops and drilling core data,the sedimentary,source rocks and reservoir characteristics of Changxing Formation in Deyang-Wusheng trough were studied.The results indicate that:(1)The platform margins on both sides of Deyang-Wusheng trough were dominated by bioclastic limestone deposits during the Changxing period,forming reef shoal reservoirs.The interior of the trough is mainly composed of deep-water siliceous mudstone deposits,forming high-quality source rocks.In the middle and late stages of Changxing Formation,the scale of reef shoals was the largest and gradually migrated and disappeared towards the trough.(2)The main reservoir rock type of Changxing Formation in Deyang-Wusheng trough is bioclastic limestone,and the reservoir space is mainly intergranular(dissolution)pores.The reservoir properties indicate that the reef shoal reservoirs of Changxing Formation belong to the medium-high porosity and low permeability type.(3)Multiple sets of high-quality source rocks are developed within Changxing Formation and the underlying strata,with Longtan Formation having the highest average TOC content.Multiple sets of source rocks and reef shoal reservoirs form a reservoir configuration of"side generation and side storage"and"bottom generation and upper storage".It is suggested that the platform margin high belt around the trough should be the key oil and gas exploration area,and reef shoal reservoirs should be mainly searched in the middle and late Changxing Formation.

关 键 词：礁滩 储层 长兴组 德阳-武胜海槽 

分 类 号：TE122.2[石油与天然气工程—油气勘探]