[an error occurred while processing this directive] 高校地质学报 2014, 20(4) 623- DOI:      ISSN: 1006-7493 CN: 32-1440/P

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本文关键词相关文章
流体包裹体
物理性质与化学成分
成藏期次
长8油层组
鄂尔多斯盆地
本文作者相关文章
PubMed
鄂尔多斯盆地中西部长8砂岩的流体包裹体特征与油气成藏期次分析
罗春艳,罗静兰*,罗晓容,白雪见,雷裕红,程明
摘要

利用流体包裹体的分析测试技术与研究方法,对鄂尔多斯盆地中西部长8油层组的成藏期次进行了研究。烃类包裹
体及其伴生的盐水包裹体的岩相学特征、均一温度、盐度、密度及成分分析显示,长8储层主要发育两期烃类包裹体,第
一期分布在早期方解石胶结物、石英颗粒表面及其连生的石英加大边中以及未切穿石英颗粒的早期愈合裂缝中,其伴生盐
水包裹体的均一温度峰值为80~90℃;第二期烃类包裹体分布在石英颗粒表面和切穿石英颗粒的裂缝中,其伴生盐水包裹
体的均一温度峰值为100~120℃。储层成岩作用与油气充注微观分析、成岩-烃类充注演化时间序列研究,结合地层埋藏史
和热史分析表明,研究区经历了三期烃类充注事件:第一期(约169~161 Ma) 充注规模小,砂岩中未捕获到这一期适合进
行均一温度与成分测定的烃类包裹体,因此本研究缺乏这期包裹体的温度与成分数据;第二期(约148~135 Ma) 烃类充注
对应前述获得均一温度与成分数据的第一期烃类包裹体;第三期烃类充注规模最大,发生在早白垩世晚期的125.2~105.7 Ma
之间,为主成藏期,对应前述获得均一温度与成分数据的第二期烃类包裹体。

关键词 流体包裹体   物理性质与化学成分   成藏期次   长8油层组   鄂尔多斯盆地  
Characteristics of Fluid Inclusions and Its Application in Analysis of Hydrocarbon Accumulation Stages from the Chang 8 Sandstone in the Middle West Area of Ordos Basin
LUO Chunyan,LUO Jinglan,LUO Xiaorong,BAI Xuejian,LEI Yuhong,CHENG Ming
Abstract:

The hydrocarbon accumulation stages of the Chang 8 Group, Yangchang Formation, Upper Triassic in the Middle West area
of Ordos Basin were studied by analyzing and testing technology of fluid inclusions. The Chang 8 reservoir shows two periods of
hydrocarbon-bearing inclusions according to the analysis of the petrography, homogenization temperature, salinity, density and
chemical composition of hydrocarbon-bearing inclusions and the associated brine inclusions. The first stage hydrocarbon-bearing
inclusions are mainly hosted in the early calcite cement, quartz grain surfaces and their syntaxial quartz overgrowths, and the
cracks healed during the early diagenetic phase that do not cut through the quartz grains. The homogenization temperature peak value
of brine inclusions associated with hydrocarbon-bearing inclusions of the first stage is mainly 80-90℃. The second stage hydrocarbonbearing
inclusions are mainly distributed in the quartz grain surfaces and the cracks healed in the late diagenetic phase that cut

diagenesis and hydrocarbon charging under microscope, diagenesis-hydrocarbon charging evolution sequence study and burial-thermal
history analysis show that three periods of hydrocarbon accumulation occurred in the study area. The first hydrocarbon charging stage
occurred from 169 Ma to 161 Ma, nearly no hydrocarbon-bearing inclusions suitable for homogenization temperature and chemical
component measurement captured in the Chang 8 sandstones due to its limited proportion. Thus inclusions’temperature and
composition data of this phase are lacking. The second hydrocarbon accumulation stage with larger dimension and broader distribution
occurred during 148-135 Ma, which corresponds to the first stage of the hydrocarbon-bearing inclusions with homogenization
temperature and composition measurement data. The third hydrocarbon charging stage occurred in the late Early Cretaceous
(125.2-105.7 Ma) and is the major hydrocarbon accumulation stage in the study area which corresponds to the second stage
hydrocarbon-bearing inclusions with homogenization temperature and composition measurement data in the Chang 8 sandstones.

Keywords: fluid inclusions   physical property and chemical composition   hydrocarbon accumulation periods   the Chang 8 Group   Ordos Basin  
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