论文部分内容阅读
评价高演化海相烃源岩已成为国内油气勘探的难点.尝试以四川南江杨坝地区下寒武统烃源岩为例,利用元素地球化学参数建立高演化海相烃源岩评价的新方法.在计算得到与海洋自生有机质相关的自生元素含量基础上,通过聚类分析将成因作用相同的自生元素聚为一类,并建立指示有机质沉积环境及基本属性的参数与自生元素含量之间的线性关系,从而优选出与有机质富集密切相关的自生元素,并利用因子分析得到4个反映有机质从形成、沉积到埋藏过程中环境变化的主因子,最终得到能够反映烃源岩的形成条件优劣的公式.依此对南江杨坝下寒武统烃源岩的品质进行划分.实践证明,该方法可为高演化海相烃源岩的评价提供一些新思路.
The evaluation of highly evolved marine source rocks has become a challenge for oil and gas exploration in China.Taking the Lower Cambrian source rocks in Yangba area, Nanjiang, Sichuan for example, a new method for the evaluation of highly evolved marine source rocks using elemental geochemical parameters Based on the calculation of the content of autotrophic elements related to marine authigenic organic matter, the authigenic elements with the same genesis and contribution are grouped together by clustering analysis, and the parameters indicating the depositional environment and basic attributes of organic matter and the content of autotrophic elements are established Linear relationship between the source rocks and the organic matter, and then the self-generated elements that are closely related to the enrichment of organic matter are optimized. Four principal factors that reflect the environmental changes during the formation, deposition and burial of organic matter are obtained by factor analysis. Finally, Poor formula.Accordingly, the quality of the Lower Cambrian source rocks in the Yangba area of Nanjiang River is divided.The practice proves that this method can provide some new ideas for the evaluation of high evolution marine source rocks.