东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

贵州丹寨古油藏形成及演化的流体包裹体证据

ISSN号：1007-2802
期刊名称：《矿物岩石地球化学通报》
时间：0
分类：P618.13[天文地球—矿床学;天文地球—地质学]
作者机构：[1]成都理工大学地球科学学院,成都610059, [2]中国科学院青海盐湖研究所,西宁810008
相关基金：国家自然科学基金项目（40930423,41372094）

关键词：包裹体, 热演化作用, 古油藏, 贵州丹寨, inclusions, thermal evolution of oil reservoir, paleo-oil reservoir, Danzhai County, Guizhou Province

中文摘要：

为探讨丹寨古油藏的形成条件和热演化历史,本文对两种产状的烃类包裹体进行了显微观察和测温研究.结果表明,丹寨古油藏经历了原油充注阶段、原油高温裂解成气阶段和地壳抬升气藏剥蚀破坏阶段.在原油早期充注阶段,捕获于方解石、石英溶孔充填物中的包裹体有气液H2O包裹体、液相烃包裹体和气液烃包裹体,其均一温度为105.8～167.3℃,盐度为13.0％～22.6％ NaC1eq,密度为1.00～1.12 g/cm3,代表原油运移充注期低温、中盐度、高密度油田流体特征.在原油高温裂解成气阶段,溶孔充填矿物中早期捕获的烃类包裹体发生变化或被破坏,包裹体中油裂解气泄露而沥青残留,形成沥青包裹体;封存完好的包裹体变为含沥青的气相烃包裹体.燕山期地壳抬升气藏剥蚀破坏阶段,形成方解石、石英构造裂隙充填物,其中的包裹体类型有沥青包裹体、气相烃包裹体和气液H2O包裹体,均一温度为147.7～245.8℃,盐度多为2.6％～8.7％ NaCleq,密度为0.85～1.00 g/cm3,反映了油藏破坏期中低温、低盐度、中密度气田流体与地下水的混合流体特征.

英文摘要：

Based on fluid inclusion study three stages of the formation and evolution of the Danzhai paleo-oil reservoir have been reconized,that is,oil filling,oil cracking and gas formation in high temperature and gas reservoir denudation by tectonic uplift.At the stage of oil filling,the inclusions captured by the filling minerals in dissolved pores of calcite and quartz included mainly gas-liquid H2O inclusions,liquid hydrocarbon inclusions,and gas-liquid hydrocarbon inclusions.The two-phase H2O inclusions had homogenization temperatures of 105.8-167.3℃,salinity of 13.0％-22.6 ％NaCleq and density of 1.00-1.12 g/cm3,suggesting that the oil fluid in this stage was characterized by low temperature,middle salinity and high density.At the stage of oil cracking and gas formation by elevated temperature,the captured inclusions were changed or destroyed,resulting in oil cracking,gas releasing,asphalt residues and formation of bitumen inclusions.The well preserved inclusions of this stage turned into bituminousbearing gas hydrocarbon inclusions.At the stage of gas reservoir denudation by tectonic uplift during the Yanshan movement,the damage of the paleo oil reservoir resulted in methane gases loss,reservoir fluid migration,and formation of fissure-filling minerals,such as calcite and quartz that contained bitumen inclusions,gas hydrocarbon inclusions and gas-liquid H2O inclusions.These inclusions had homogenization temperatures of 147.7-245.8℃,salinity of 2.6％-8.7％ NaCleq and density of 0.85-1.00 g/cm3,reflecting that characteristics of mixed gas field fluid and groundwater were low to medium temperature,low salinity and medium density.

同期刊论文项目