四川盆地下组合水文地质条件与天然气保存  

Hydrogeologic Conditions and Natural Gas Preservation in Lower Assemblage in the Sichuan Basin

作　　者：孙玮[1] 王晨霞[1] 罗冬梅 秦成明[3] 李智武[1] 

机构地区：[1]成都理工大学,四川成都610059 [2]<天然气工业>杂志社,四川成都610051 [3]中油西南油气田分公司,四川成都610051

出　　处：《特种油气藏》2014年第6期70-74,144,共5页Special Oil & Gas Reservoirs

基　　金：国家重点基础研究发展计划"973"课题"中上扬子地区构造演化与下古生界油气多期成藏"(2012CB214805)

摘　　要：四川盆地下组合水文地质条件可以反映天然气的保存条件。利用盆地内部及周缘钻至震旦系灯影组的探井地层压力、水化学等资料,分析了下组合水文地质条件,并进一步探讨天然气保存条件。结果表明:由盆地至造山带水文矿化度变低,受地表水影响大,渐变为水冲刷淡化区,天然气保存条件逐渐变差。川中地区天然气保存条件最好,属高压卤水封闭区。据此推断四川盆地下组合的勘探应着眼于盆地内封闭区,而不是周缘造山带,该结论对四川盆地深层下组合勘探有重要的指导意义。Hydrogeologic conditions in lower assemblage in the Sichuan Basin can reflect preservation conditions of natural gas. Using formation pressure,hydrochemistry and other data of exploratory wells drilled to Sinian Dengying Fm inside and at periphery of the Sichuan Basin,hydrogeologic conditions in lower assemblage were analyzed,and natural gas preservation conditions were further discussed. The results show that hydrologic salinity becomes lower from this basin to orogenic zone,and gradually becomes water washing desalination area affected much by surface water,and natural gas preservation conditions become worse. Natural gas preservation conditions in central Sichuan Basin are the best,belonging to high- pressure bitter closed area. Thus it is concluded that the exploration in lower assemblage in the Sichuan Basin should focus on the closed areas within this basin,not the periphery orogenic zones. This conclusion provides an important reference for the exploration in deep lower assemblage in the Sichuan Basin.

关 键 词：天然气保存 下组合 水文地质 四川盆地 

分 类 号：P618.130.2[天文地球—矿床学]