吐哈盆地鲁克沁构造带流体地球化学、动力与油气运移和聚集  

Fluid geochemistry, dynamics and hydrocarbon migration and accumulation in Lukeqin structure, Turpan Hami basin

作　　者：曾溅辉[1] 左胜杰[1] 

机构地区：[1]石油大学(北京)盆地与油藏研究中心教育部石油天然气成藏机理重点实验室

出　　处：《石油勘探与开发》2002年第1期72-75,共4页Petroleum Exploration and Development

摘　　要：通过对吐哈盆地鲁克沁构造带流体包裹体和地层水化学成分以及油气运移和聚集条件的研究 ,认为 :①鲁克沁构造带流体地球化学演化表现为 :从古至今封存条件变好 ,现今地层水经历了相对于古流体更为强烈的流体 岩石相互作用 ,地层水矿化度和各种主要化学组分的含量增大 ,封闭条件比古流体更好。吐玉克区块的古流体经历了相对较强的蒸发浓缩作用和流体 岩石相互作用 ,而玉东和鲁克沁区块的古流体大多经受过大气降水的淋滤作用。②鲁克沁构造带流体动力演化可划分为两个阶段 :第一阶段为印支末期—中燕山期 ,存在两种地下水流 ,一种为自西北向东南的沉积水流 ,另一种为自东南向西北的大气淋滤水流 ,水动力强度较大。第二阶段为燕山晚期—现今 ,主要表现为沉积水自深部向浅部的侧向和垂向运动 ,但流体动力强度较小。③地层流体地球化学和流体动力研究进一步证实 ,鲁克沁构造带油气是从西北向东南方向运移的 ,晚三叠世后期—中侏罗世早期边运聚边降解 ,中侏罗世中晚期—现今的降解作用减弱 ,主要表现为油气藏的保存和调整。图 2表 1参The geochemical analysis of underground water and fluid inclusion and the research on conditions for hydrocarbon migration and accumulation in Lukeqin structure, Turpan Hami basin have shown that: (1)the plaeo fluid in Tuyuke experienced stronger evaporation and rock fluid interaction while the plaeo fluid in Yudong and Lukeqin mostly experienced rain precipitation. Nowadays fluid has better conditions of occlude and experienced much stronger rock fluid interaction. The geochemical evolvement of fluid in Lukeqin structure shows that occlusion condition became better, rock fluid interaction became stronger, the content of geochemical component and the total dissolved solution increased. (2)The underground water dynamical evolvement in Lukeqin structure could be divided into two phases: The first phase is late Indosinian epoch to middle Yanshan epoch. During this period there existed two types of underground water, one was the sedimentary water from northwest to southeast, the other was atmosphere water from southeast to northwest with stronger hydraulic power. The second phase is from late Yanshan epoch to now, during this period the main movement is sedimentary water migration from deep to upper formation laterally and vertically with smaller hydraulic power. (3)The research on geochemistry and hydraulics of geofluid verify that the hydrocarbon migrated from northwest to southeast in Lukeqin structure. During late Triassic to middle Jurassic, hydrocarbon had been degraded along with migration. During middle Jurassic to now, the degradation became weak, the reservoirs formed previously were only modulated.

关 键 词：吐哈盆地 鲁克沁构造带 流体包裹体 地层水 化学成分 流体动力演化 油气运聚条件 

分 类 号：P618.130.1[天文地球—矿床学] TE12[天文地球—地质学]