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On the basis of the results of hydropyrolysis simulations for about 90 different types of immature to mature source rocks
selected from about 5 000 marine source rocks in China, along with the natural thermal evolution profiles, the following conclusions
were obtained. (1) Total organic carbon (TOC) content of excellent marine source rocks does not change obviously when Ro < 0.8% or Ro > 1.3%, and the residual TOC content is decreasing gradually with the maturity increase at 0.8% < Ro < 1.3%. (2) At the high-post mature stage (Ro > 1.3%), the decreased maximums of residual TOC content for the kerogen of sapropel (I), II1, and II are usually 40%, 32% and 24%, respectively, and their TOC restitution coefficient is, respectively, 1.68, 1.48 and
1.32. (3) Both the TOC decreasing amplitude and the restitution coefficient decrease gradually with the decrease of TOC content
for the source rocks with low organic matter abundance (usually 0.3% < TOC < 1.0%). The TOC restitution coefficients are,
respectively, 1.20 and 1.0, when 0.3% < TOC < 0.5% and TOC < 0.3%. (4) TOCres of solid bitumen and shale with high organic matter abundance (TOC > 30%) also require no restitution at the high mature
stage. Such kind of TOC restitution is further supported by the coincidence of the decrease of residual TOC with the decreasing
of S1 + S2 and the increasing of hydrocarbon quantity during the experimental simulation of hydrocarbon generation and expulsion for
marine source rocks (0.3% < TOC < 30%) in natural thermal evolution profiles.
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Translated from Earth Science—Journal of China University of Geosciences, 2007, 32(6): 853–860 [译自: 地球科学—中国地质大学学报] 相似文献
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针对塔里木盆地沙漠边缘区的特殊近地表景观地质条件,油气化探应从方法的选取、样品的采集、数据处理等多方面减小和抑制随机干扰因素对化探指标的影响.在已知油气藏上方吸附丝法的应用研究结果表明：在沙漠区油气化探工作中,吸附丝法的有效指标（C2～C8、C11～C12等）以不同的异常模式很好地指示了深部油气藏信息. 相似文献
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TD-2 structure is located in the eastern part of the Central Uplift zone of the Tarim Basin, China. It is a basement-uplift anticline-type structure confirmed by seismic and gravity prospecting, and it is expected to have good potential for oil and gas according to the analysis of regional geological evolution history. But further exploration such as drilling is suspended because of lacking direct geochemical information. Therefore, multi-parametric geochemical surveys, such as free hydrocarbons (C1-C5), acid hydrocarbons (C1-C5) and ?C, Hg of soil, were conducted. It is concluded in this paper that free hydrocarbons are obviously better than other geochemical parameters and could be used for evaluation of oil and gas potential of TD-2 structure in the desert area. Shapes of near-surface geochemical anomalies and geochemical characteristic parameters suggested that TD-2 structure was a dry gas-bearing structure at the early-middle dissipation stage. So TD-2 structure should have some promising potential for oil-gas. Multi-parametric geochemical survey provided important information for further drilling exploration. 相似文献
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贵州凯里寒武系底部硅质岩系生物组成、沉积环境与烃源岩发育关系研究 总被引：1，自引：0，他引：1
贵州凯里麻江地区羊跳剖面寒武系牛蹄塘组底部发育了一套3.2m厚的硅质岩系。通过对其进行高频逐层采样68件,根据沉积环境-生物组成-烃源岩形成的思路,精细分析了生物组成及有机碳TOC含量,进而讨论了沉积环境与烃源岩发育的关系。结果表明,该剖面生物组成多样,包括有浮游藻、底栖宏观藻、疑源类、海绵骨针、须腕动物蠕虫等,并可归纳为三大类生物微相:浮游藻类、底栖藻类、其它生物类型。不同藻类体和不同疑源类所反映的水体深度特征显示,该套烃源岩沉积经历了先水进后水退的过程,水体深度最深时期,底栖红藻和Heliosphaeridium longum-Asteridium tornatum疑源类组合发育,烃源岩有机碳含量也较高(TOC平均值为4.73%,最高可达13.97%),说明利于烃源岩发育。总体而言,不同生物微相烃源岩TOC含量不同,底栖藻类(平均值3.50%)浮游藻类(平均值1.46%)其它生物类(平均值1.0%)。而须腕动物蠕虫和海绵动物的发现反映了热液环境,受热水事件影响强烈的样品TOC最低(TOC含量为0.90%和0.94%),说明热液活动强烈对烃源岩发育可能具有一定的不利影响。 相似文献
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