四川盆地南部纳溪—塘河地区下三叠统嘉陵江组含硫气藏成因  

GENETIC OF SOUR GAS RESERVOIR IN LOWER TRIASSIC SERIES NAXI-TANGHE AREA,SOUTH OF SICHUAN BASIN

作　　者：李延钧[1] 刘麟[1] 刘臣[1] 李其荣[1] 袁续祖[2] 杨坚[2] 

机构地区：[1]西南石油大学,四川成都610500 [2]中国石油西南油气田分公司蜀南气矿,四川泸州646000

出　　处：《天然气地球科学》2007年第5期732-736,共5页Natural Gas Geoscience

基　　金：四川省重点学科建设项目(编号:SZD0414)资助

摘　　要：四川盆地南部纳溪-塘河地区下三叠统嘉陵江组气藏属于含硫气藏，其整体H2S含量在整个泸州古隆起属较高，局部地区H2S含量高达25～30g／m^3以上，其嘉一气藏H2S主要为含硫有机质裂解成因，而嘉二、嘉三一嘉四气藏H2S主要为热化学硫酸盐还原作用（TSR）成因，而H2S成因类型与含量高低随着天然气成藏过程的变化而变化，燕山早一中期深层志留系来源的气向上运聚成藏，嘉陵江组各气藏呈现低含生源成因H2S特征，燕山末期一喜山早期嘉陵江组储层古地温大多高达140℃以上，含膏岩分布的嘉二、嘉三一嘉四气藏大量发生TSR反应，形成TSR反应成因为主的高含硫气藏，在喜马拉雅运动中晚期由于构造抬升、古地温大幅度降低，TSR反应减慢甚至终止，由于地层水对H2S的溶解作用，使含硫气藏H2S含量重新分配和调整，从而造成不同区域或不同气藏的舍硫量具有较大差异。The gas reservoirs of the lower Triassic Jialingjiang formation belong to sour gas reservoir in the Naxi-Tanghe area located in the south of Sichuan basin, with higher H2S content in the Luzhou palaeouplift. The H2S content is about 25-30 g/m^3. The results show that the H2S in the first member of Jialinjiang formation gas reservoir is mainly derived from the cracked organic matter, whereas the H2S in the second member and 3-4 member of Jialinjiang formation gas reservoir is mainly formed through the thermochemical sulphate reduction （TSR）. The gas accumulation process is the key to the origin and contents of the H2S. The gas from the deep Silurian source is upward migration and accumulation. Gas reservoirs of Jialingjiang formation have the low content of biological H2S in early-mid Yanshanian. The palaeo-geothermal temperature of Jialinjiang formation reservoir is more than 140℃ in the late Yanshanian-early Himalayan epoch. TSR reaction happens in the second member and 3 - 4 member of Jialinjiang formation Gas reservoirs that contain gypsum, and forms the sour gas reservoirs through the thermochemical sulphate reduction. As the tectonic uplift to a significant temperature reduction, TSR reaction slow down or even terminate in the mid late Himalayan. Meanwhile, the content of H2S in sour gas reservoirs is redistribution and adjustment because of the dissolution of formation water to the H2S. Thus, the different sulfur content in the different regions or different gas reservoirs occurs.

关 键 词：含硫气藏 硫化氢成因 热化学硫酸盐还原作用 下三叠统嘉陵江组 川南 

分 类 号：TE122.113[石油与天然气工程—油气勘探]