碳酸盐岩缝合线与基质的排烃效应——以川东地区石炭系和奥陶系碳酸盐岩为例

发布时间：2018-01-14 01:24

本文关键词：碳酸盐岩缝合线与基质的排烃效应——以川东地区石炭系和奥陶系碳酸盐岩为例　出处：《石油与天然气地质》2017年03期 　论文类型：期刊论文

【摘要】：为了探究碳酸盐岩缝合线与基质的排烃效应及其物质组成的差异,采集了四川盆地东部大池干构造带座3、池53、五科1等取心井含缝合线的石炭系和奥陶系碳酸盐岩岩心样品,进行了缝合线与基质的岩心与铸体薄片观察以及全岩X-射线衍射矿物成分含量、有机碳含量、热解(Rock-Eval)、可溶有机质抽提、族组分分离与定量等实验测试。实验分析表明,缝合线比基质的物质组成有较大差异,这主要与压溶作用有极为密切的关系。由于碳酸盐矿物的压溶作用,缝合线比基质含有更多的白云石、黄铁矿、有机质等不溶物质,矿物颗粒主要呈基底胶结、杂基支撑,基质中的矿物颗粒之间主要呈线状、凹凸状紧密接触。这种矿物组成和结构特征使得缝合线比基质有相对更好的孔渗性,可以成为地质历史时期中碳酸盐岩内部流体排出的重要通道,所以,缝合线的排烃效应比基质明显。对于含有缝合线的低有机质丰度碳酸盐岩来说,缝合线有机质可以作为碳酸盐岩生烃的重要补充。此外,缝合线中较多的可溶有机质对热解参数有一定影响。
[Abstract]:In order to investigate the difference of hydrocarbon expulsion effect and material composition between carbonate suture line and matrix, we collected 3 and 53 blocks of Dazheng structural belt in the east of Sichuan Basin. The samples of Carboniferous and Ordovician carbonate cores with suture lines in the core wells of Wuke 1 and so on were observed on the core and cast of suture lines and matrix, and the contents of X- ray diffraction minerals and organic carbon in the whole rock were observed. Pyrolysis of Rock-Evaln, extraction of soluble organic matter, separation and quantification of group components, etc. The experimental analysis shows that the material composition of suture line is different from that of matrix. The suture line contains more dolomite, pyrite, organic matter and other insoluble substances than the matrix because of the pressure dissolution of carbonate minerals. The mineral particles in the matrix are mainly linear, concave and convex close contact. This mineral composition and structure make the suture has better porosity and permeability than the matrix. Therefore, the hydrocarbon expulsion effect of suture lines is more obvious than that of matrix, for carbonate rocks with low organic matter abundance. Suture organic matter can be used as an important supplement for hydrocarbon generation of carbonate rocks. In addition, more soluble organic matter in suture line has certain influence on pyrolysis parameters.
【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;
【基金】：国家自然科学基金项目(41372142)
【分类号】：P618.13
【正文快照】： 缝合线是碳酸盐岩中矿物在应力作用下发生溶解作用从而形成的一种重要的地质现象[1]。碳酸盐岩有机质分布具有较强的非均质性,其中缝合线是有机质富集和流体运移的重要部位[2-5]。有关碳酸盐岩中缝合线的分布、形态类型、物质组成、成因已进行了较多的研究[1-5],缝合线对储集

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