双金刚烷指标作为下古生界高、过成熟阶段碳酸盐岩成熟度衡量标尺的讨论  

A discussion about diamantane ratios as maturity indicators of Lower Paleozoic carbonate source rocks at high and over mature stages.

作　　者：李景贵[1] 崔明中[1] 张谦[1] 

机构地区：[1]中国科学院兰州地质研究所

出　　处：《石油勘探与开发》1998年第2期83-85,共3页Petroleum Exploration and Development

基　　金："九五"国家发展计划委员会科技攻关项目

摘　　要：在鄂尔多斯盆地中部气田下奥陶统马五段３口井（陕参１井、陕４２井和陕１７井）２０个碳酸盐岩气源岩样品沥青“Ａ”和沥青“Ｃ”抽提物饱和烃馏分中均检测出了双金刚烷类化合物。研究发现在３．１０～３．８０ｋｍ埋深范围内，绝大多数沥青“Ａ”和沥青“Ｃ”样品的双金刚烷指标变化范围分别为５５％～６５％和４０％～５５％；在Ｒｏ值为１．９％～３．９％的变化范围内，８０％左右的沥青“Ａ”和沥青“Ｃ”样品的双金刚烷指标变化范围也分别为５５％～６５％和４０％～５５％。由于处于过成熟阶段（Ｒｏ值大于２．０％）的马五段的双金刚烷指标变化范围窄，故双金刚烷指标与岩石样品Ｒｏ值及埋深不具线性变化关系。图４表２参１（邓春萍摘）Diamantane compounds were detected out from saturated hydrocarbon fractions of chloroform bitumen A and C of carbonate source rock samples from three wells (Shancan 1, Shan 42 and Shan 17) in O 1m 5 sections of the central gas field of Ordos basin. Stydy results indicate that in the buried depth of 3.10 3.80km, most of the diamantane ratios of chloroform bitumen A and C samples change within 55% to 65% and 40% to 55% respectively. In the 1.9% to 3.9% range of R o(converted from bitumen reflectance), the diamantane ratios of 80% or so chloroform bitumen A and C samples also change within 55% to 65% and 40% to 55% respectively. Diamantane ratios do not have a linear relation to vitrinite reflectance (converted from bitumen reflectance)and depth because of narrow change ranges in the diamantane ratios of O 1m 5 sections at over mature stage ( R o>2.0%) as mentioned above.

关 键 词：碳酸盐岩 金刚烷类烃 古生界 油气藏 成熟度 

分 类 号：P618.130.1[天文地球—矿床学]