黄骅坳陷沧东凹陷孔二段细粒沉积岩中方沸石的发现及其地质意义

摘要/Abstract

摘要： 通过大量岩石薄片鉴定和X射线衍射全岩分析，首次在黄骅坳陷沧东凹陷孔二段细粒沉积岩和致密砂岩夹层中发现大量自生方沸石。方沸石在显微镜下表现为以纹层状富集为主，局部呈泥—微晶分散状分布，少量呈粉晶或连晶胶结物充填粒间孔隙、粒内孔隙、裂缝及液化脉;宏观上表现为与黏土矿物关系密切，矿物含量此消彼长。这种赋存特征间接指明了方沸石早成岩期非火山物质成因的特点，与该区细粒沉积岩中缺少火山物质相吻合。作为碱性成岩环境下析出的自生矿物，方沸石的富集产出可指示盐碱性的沉积水体环境。同时，其早期胶结可抑制压实作用，保存部分孔隙空间，并在后期易与有机酸发生反应，局部溶蚀形成次生孔隙，对致密储层储集性能的改善具有十分重要的意义。

关键词: 黄骅坳陷, 沧东凹陷, 细粒沉积岩, 方沸石, 成岩作用, 孔店组

Abstract: Based on thin section analysis and X-Ray diffraction bulkrock analysis, large amount of authigenic analcite is discovered for the first time in fine-grained sedimentary rocks and tight sandstone interbeds of the Second Member of Kongdian Fromation (Ek₂) in Cangdong sag, Huanghua Depression. Under microscope, analcite is observed mainly in the form of concentrated laminations, locally as dispersed micro-crystals, and occasionally as silt to coarse sized cement, filled in inter- and intro-granular pores, as well as in fractures and liquefied veins. This occurrence of analcite suggests an early diagenetic origin. Macroscopically, it is closely related to clay minerals and the mineral contents display an interactive relationship, which indicates a non-volcanic precursor, consistent with the lack of volcanic detritus in the fine-grained deposits in this block. As an authigenic mineral precipitate under alkaline environment, its early diagenetic origin indicates that the sedimentary water body was moderately saline and alkaline. Moreover, its early precipitation could inhibit compaction and partially preserve pore spaces, and in deeper burial diagenesis, secondary pores are fromed due to local dissolution of analcite when react with organic acid. In this way, analcite plays an important role in improving properties of tight reservoirs.

张跃, 陈世悦, 孟庆爱, 鄢继华, 蒲秀刚, 韩文中. 黄骅坳陷沧东凹陷孔二段细粒沉积岩中方沸石的发现及其地质意义[J]. 中国石油勘探, 2015, 20(4): 37-43.

Zhang Yue, Chen Shiyue, Meng Qing’ai, Yan Jihua, Pu Xiugang, Han Wenzhong. The Discovery of Analcite in Fine-Grained Sedimentary Rocks of The Second Member of Kongdian Formation in Cangdong Sag, Huanghua Depression: Implications for Early Digenetic Environment[J]. China Petroleum Exploration, 2015, 20(4): 37-43.

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