准噶尔盆地阜康西区块西山窑组构造-水文地质控气特征  

Gas-Controlling Characteristics of Structural and Hydrogeological Factors in Xishanyao Formation of Western Fukang Block, Junggar Basin

作　　者：李升[1,2] 葛燕燕[1,2] 杨雪松 李鑫[4] 傅雪海[4] 

机构地区：[1]新疆大学地质与矿业工程学院,乌鲁木齐830046 [2]新疆煤层气工程技术研究中心,乌鲁木齐830046 [3]新疆科林思德新能源有限责任公司,乌鲁木齐830046 [4]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221000

出　　处：《新疆石油地质》2016年第6期631-636,共6页Xinjiang Petroleum Geology

基　　金：新疆维吾尔自治区高校科研计划青年教师科研启动基金(XJEDU2013S05);新疆维吾尔自治区青年自然科学基金(2015211C281);国家科技重大专项(ZX201605043)

摘　　要：为查明准噶尔盆地阜康西区块中侏罗统西山窑组煤层控气地质作用,依据区域性水文地质边界池钢逆断层,将区块划分为2个构造单元,依据甲烷风化带、水文地质条件划分出煤层气富集单元。在对研究区构造特征和水文地质特征进行分析的基础上,探讨了构造-水文地质耦合控气机制。研究结果表明,阜康西区块西山窑组煤层气富集是构造-水文地质耦合作用的结果,构造运动使煤层发生动力变质作用与深成变质作用,有助于热成因气生成;燕山运动晚期与喜马拉雅运动期水平挤压运动产生的封闭性褶皱和逆冲断层有助于煤层气保存,燕山运动早期构造抬升不利于原生生物成因煤层气保存;地下水侧向补给至高矿化度滞留区,煤层气因水力封堵作用而富集。而中—浅部西山窑组煤层埋深小于600 m的斜坡带则由于构造抬升、较强的季节性径流和蒸发,导致煤层气逸散,同时气候干旱导致的高矿化度地层水抑制次生生物成因气生成,煤层气含量相对较低。In order to understand the geological gas-controlling functions in the coalbeds of the Middle Jurassic Xishanyao formation inwestern Fukang block, Junggar basin, the block is divided into 2 structural units according to the regional hydrogeological boundary--Chi-gang reverse fault and CBM-rich units are classified based on methane weathering zone and hydrogeological conditions. Based on the analy-sis of structural and hydrogeological features, the paper discusses the coupled structural-hydrogeological gas-controlling mechanism. Thestudy results show that the enrichment of CBM in the Xishanyao formation of western Fukang block should be the product of the coupledfunctions of structure and hydrogeology conditions. Tectonic movements resulted in dynamic metamorphism and plutonic metamorphism incoalbeds, which are helpful for the generation of thermogenic gas; the sealed folds and thrust faults resulted from horizontal compression inthe late Yanshan movement and Himalayan movement contributed to CBM preservation, whereas the tectonic uplift in the early Yanshanmovement was not conductive to primary biogenic gas preservation; CBM accumulation by hydraulic seal occurred due to the lateral charg-ing of groundwater into the stagnation areas with high salinity. CBM losses in the coalbeds with the burial depth lower than 600 m in themiddle-upper Xishanyao formation were caused by tectonic uplift, relatively strong seasonal runoff and evaporation. Meanwhile, high-salini-ty formation water due to arid climate restrained the generation of secondary biogenic gas, resulting in the low content of CBM.

关 键 词：准噶尔盆地 阜康西区块 中侏罗统 西山窑组 煤层气 构造-水文地质控气作用 含气量 

分 类 号：TE112.23[石油与天然气工程—油气勘探]