地层记录中内波、内潮汐沉积研究进展及其页岩气勘探意义  

Advances in research of geological internal-wave and internaltide deposits and their exploration significance in shale gas

作　　者：李向东[1] LI Xiangdong(School of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《中南大学学报（自然科学版）》2021年第10期3513-3528,共16页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41272119);自然资源部深地动力学重点实验室开放课题基金资助项目(J1901-16)。

摘　　要：基于已有地层记录研究成果,结合现代海洋中对内波、内潮汐特性的研究,从沉积流体和沉积作用角度对地层记录中内波、内潮汐沉积研究进行总结。研究结果表明:1)周期性的韵律沉积可能是内波、内潮汐沉积的普遍表现形式,其在空间上可分为在破碎带对已有沉积物改造和流体交互作用沉积以及在非破碎带与营养运输和静水效应相关的沉积;2)虽然目前内波、内潮汐沉积尚无排他性鉴别标志,但是在确定深水沉积环境之后,沉积构造可能为内波、内潮汐沉积的重要鉴别标志;3)深水环境下内波、内潮汐可能在细粒沉积中形成有机质和脆性矿物富集及相应的沉积构造,从而形成页岩气储层并能有效地提高其油气水平运移能力和可压裂性。因此,从深水牵引流沉积演化的角度对页岩气储层特征进行探索和研究,对于提高页岩气勘探的系统化程度和可预测性具有重要意义。Geological internal-wave and internal-tide deposits were summaried from the perspective of sedimentary flows and their sedimentations based on available geological research findings combined with studies of internal-wave and internal-tide characteristics in modern oceans. The results show that: 1) The common characteristic of internal-wave and internal-tide deposits perhaps is periodical rhythmic deposition which both includes re-deposit of unconsolidated sea floor sediments and the depositions related to nutritional transport and hydrostatic effect in breaker-surf and non-breaker-surf zone of internal-waves and internal-tides respectively. 2)Although there are at present non-exclusive identification characteristics of internal-wave and internal-tide deposits, sedimentary structures perhaps are the most important identification characteristic for these deposits if the deep-water environment is ensured. 3) Internal-waves and internal-tides also perhaps enrich organic matters and brittle minerals in deep-water fine-grained deposits and form related sedimentary structures and thus constitute shale gas reservoir as well as increase its horizontal transport capability and fracturing for hydrocarbon. Therefore,there would be an important significance for the increasing systematization degree and predictability of shale gas explorations if the sedimentary evolutions of deep-water traction current are used in the exploration and study of shale gas reservoir characteristics.

关 键 词：内波、内潮汐沉积 沉积构造 鉴别标志 页岩气 

分 类 号：P512.2[天文地球—地质学] TE132.2[石油与天然气工程—油气勘探]