流体包裹体主要成分及谱学特征研究——以塔河油区下奥陶统储层为例

APPROACHING TO CHEMICAL COMPOSITION AND APPLICATION OF RAMAN SPECTRUM OF FLUID INCLUSION——TAKING THE LOWER ORDOVICIAN RESERVOIRS IN TAHE AS AN EXAMPLE

通过对塔河油区下奥陶统储层的流体包裹体特征以及拉曼位移和成分特征、主要成分含量(CO2,CH4,H2O等)与埋藏深度关系等研究发现:①下奥陶统储层中存在2大类8个种类及4种组合的流体包裹体;②下奥陶统储层流体包裹体以富含CO2与CH4烃类包裹体和H2O—CO2盐水包裹体为主;③在单个包裹体中,甲烷拉曼特征峰随埋藏深度总体是升高趋势,而其相对含量则为先升后降;④二氧化碳拉曼特征峰、相对含量随埋藏深度同时呈下降趋势;⑤水的拉曼特征峰随埋藏深度呈一定的非线性变化趋势;⑥气相中甲烷与二氧化碳的摩尔百分含量呈消长关系;它们均可用于推测油气捕获时的成熟度指标,而水的拉曼位移随埋深变化则可间接判断其溶液介质性质。

Based on the studies of chemical composition and features of Raman spectrum （LRM）, together with the relationship between the displacement values（v） of the major chemical composition CO2, CH4 , H2O and the buried depth of fluid inclusion, the author has shown that. 1）It can be proposed that there are al least eight types and four assemblages inclusions occurred in the Lower Ordovician reservoirs; 2） q he richness of CO2-,CH4-hydrocarbon and H2 O--CO2 brine inclusion are dominant in those assemblages; 3） In a single inclusion, the content of methane in gas phase increase initially but decreases at later wilh increasing that of depth; 4） The displacement value（v） and content of methane simultane ously decrease with the buried depth of samples; 5） The displacement value（v） of water presents a nonline covariance with the depth of samples; 6） The contents of methane in gas phase demonstrated a negative linear covaliance of its contents carbon dioxide; and the author believed that those parameters can be used as thv indicator of maturity of hydrocarbon emplacement.