摘要
海相页岩气储层与深水牵引流沉积均主要形成于陆棚和海盆的深水环境且粒级相同,探讨两者之间的关系对于海相页岩气勘探和深水牵引流沉积研究均具有重要意义。从中国南方海相页岩气储层的分布特征、孔隙发育特征、储层非均质性和深水牵引流沉积特征等4个方面进行了详细分析。结果表明:中国南方海相页岩气储层多形成于海侵背景,与深水牵引流沉积发育的沉积背景一致;页岩气储层的储集性能主要受有机质、脆性矿物含量、黏土矿物含量和生物硅质含量等因素影响,而深水牵引流沉积则往往具有脆性矿物和有机质富集的特点;不同的岩石类型和岩相类型在垂向的薄互层或夹层及横向变化是页岩气储层非均质性的物质基础,而薄互层或夹层正好是深水牵引流沉积的显著特征。因此,深水牵引流作用有可能是海相页岩气储层形成的一个重要控制因素。
Marine shale gas reservoirs and deep-water traction flow deposits are mainly formed in the deep-water environment of continental shelf and basin with the same grain size.Exploring the relationship between them is of great significance for marine shale gas exploration and deep-water traction flow deposition research.The distribution characteristics,pore development characteristics,reservoir heterogeneity and deep-water traction flow sedimentary characteristics of marine shale gas reservoirs in South China were analyzed in detail.The results show that marine shale gas reservoirs in South China are mostly formed in the transgressive background,which is consistent with the sedimentary background of the development of deep-water traction flow deposits;the shale gas reservoir performances are mainly influenced by the contents of organic matter,brittle minerals,clay minerals and biological silicon,while deep-water traction flow deposits are usually characterized by the enrichment of brittle minerals and organic matter;the vertical thin interbeds or alternate beds of different rock types and lithofacies types and its lateral variations are both the material bases of shale gas reservoir heterogeneity,and thin interbeds or alternate beds are just the marked features of deep-water traction flow deposits.Therefore,the action of deep-water traction flow perhaps is an important controlling factor for the formation of marine shale gas reservoirs.
作者
李向东
魏泽昳
LI Xiangdong;WEI Zeyi(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan)
出处
《长江大学学报（自然科学版）》
2023年第4期1-15,共15页
Journal of Yangtze University(Natural Science Edition)
基金
国家自然科学基金项目“阿拉善地块东南缘与鄂尔多斯盆地西缘中、上奥陶统浊流演化及其与内波相互作用研究”(41272119)
昆明理工大学“双一流”科技专项“云南省个旧-麻栗坡矿集区多类型多期次锡钨矿成矿规律及增储”(202202AG050006)
自然资源部深地动力学重点实验室开放课题基金资助项目“宁夏香山群徐家圈组热液引发的内波、内潮汐沉积及其地球动力学意义”(J1901-16)。
关键词
页岩气
储层特征
脆性矿物
深水环境
牵引流沉积
shale gas
reservoir characteristics
brittle mineral
deep-water environment
traction flow deposits
