川西坳陷深层叠覆连续型致密砂岩气藏气水分布特征及成因机制  

Characteristics and Genetic Mechanisms of Gas-Water Distribution in Deep-Buried Continuous Superimposed Tight Sandstone Gas Reservoirs in Western Sichuan Depression, Sichuan Basin

作　　者：陈冬霞[1] 王翘楚 祝渭平 姚东升 熊亮[3] 曾溅辉[1] 吴滨舟 王福伟 Chen Dongxia;Wang Qiaochu;Zhu Weiping;Yao Dongsheng;Xiong Liang;Zeng Jianhui;Wu Binzhou;Wang Fuwei(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Northwest Branch of China Petroleum Exploration and Development Research Institute,Lanzhou 730020,China;Research Institute of SINOPEC Southwest Oil and Gas Company,Chengdu 610212,China)

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京昌平102249 [2]中国石油勘探开发研究院西北分院,甘肃兰州730020 [3]中国石化西南油气分公司研究院,四川成都610212

出　　处：《地球科学》2025年第1期110-126,共17页Earth Science

基　　金：国家自然科学基金项目(Nos.41472110,41972124)。

摘　　要：川西坳陷深层叠覆型致密砂岩气藏气水分布特征及其形成机理和演化规律认识不清,已经成为制约天然气勘探和开发的关键问题.利用钻井、测井、地震、录井、生产测试等资料,在对上三叠统须家河组致密气藏气水分特征分析的基础上,综合研究了气水分布的控制因素、形成机理和成因演化.结果表明,须四上亚段气水呈“层状”分布但气水边界模糊;须四下亚段和须二段地层水呈“孤立状”分布.烃源岩供烃能力对气水分布具有宏观控制作用,断裂对天然气和地层水具有沟通和破坏双重作用,储层非均质对气水分布进一步调整.孔隙流体状态控制下的3个流体动力场内地层水的赋存特征存在明显差异,并形成不同的气水分布样式.依据流体动力场演化、源岩生排烃史及构造演化特征,划分出气水分异期、气水各异期、气水调整期及气水定型期4个阶段.Deep-buried superimposed tight sandstone gas reservoirs in the western Sichuan Depression are characterized by intensive heterogeneity with obvious water production.However,the mechanisms of gas-water distribution and its evolutionary processes are still unclear,which constrains the natural gas exploration and exploitation severely.Based on the data of drilling,well-logging,production and laboratory experiments,this study reveals the distribution characteristics,controlling factors and mechanisms of gas-water distribution of the tight gas reservoirs in upper Triassic Xujiahe Formation.Furthermore,this study also establishes a genetic evolution model of gas-water distribution.The research results show obvious disparity of gas-water distribution between different members of Xujiahe Formation.The gas-water distribution in the upper 4th Member of the Xujiahe Formation shows"layer-like"pattern,which is characterized by vague gas-water interface,while the regular distribution pattern(gas over water)and reverse distribution pattern(water over gas)with obvious gas-water interface only occur in part of the reservoirs.The gas-water distribution in lower 4th Member and 2nd Member of the Xujiahe Formations is characterized by"water surrounded by gas"pattern,the formation water is characterized by"island-like"distribution pattern.The hydrocarbon generating capacity of source rocks controlled the gas-water distribution at macroscopic level,while faults had dual influences of connecting and disrupting on the gas-water distribution.The reservoir heterogeneity further adjusted the water-gas distribution.The distribution of microscopic pore fluids had significant influence on water-gas distribution of the tight sandstone gas reservoirs,the three hydrodynamic fields controlled by pore fluids led to different occurrence characteristics of formation water and hence the different gas-water distribution.According to the evolution of hydrodynamic fields,hydrocarbon generating and expelling history and characteristics of tectonic evoluti

关 键 词：致密砂岩气藏 气水分布 成因机制 川西坳陷 须家河组 石油地质学 

分 类 号：P618.13[天文地球—矿床学]