新疆准噶尔盆地玛湖凹陷玛页1井宾夕法尼亚亚系至乌拉尔统风城组孢粉地层学研究  

Palynostratigraphy of the Fengcheng Formation(Pennsylvanian to Cisuralian) from the Maye-1 borehole in the Mahu sag, northwestern Junggar Basin, Xinjiang, Northwest China

作　　者：师天明 张华[2] 肖继南 阿木提·阿丽亚 刘锋 唐鹏[2] 朱莉叶 谢媛 彭辉平 SHI Tian-ming;ZHANG Hua;XIAO Ji-nan;AMUTI Aliya;LIU Feng;TANG Peng;ZHU Li-ye;XIE Yuan;PENG Hui-ping(Research Institute of Experiment and Detection of Xinjiang Oilfield Company,Karamay,834000,Xinjiang,China;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Nanjing 210008,China)

机构地区：[1]中国石油新疆油田分公司实验检测研究院,新疆克拉玛依834000 [2]中国科学院南京地质古生物研究所,现代古生物学和地层学国家重点实验室,南京210008

出　　处：《古生物学报》2022年第4期615-627,共13页Acta Palaeontologica Sinica

基　　金：中国科学院战略性先导科技专项(B类)(XDB26010501)、中国科学院前沿科学重点研究项目(QYZDY-SSW-DQC023);第二次青藏高原综合科学考察研究(2019QZKK0706);国家自然科学基金委地区基金重点项目(U1702242);新疆油田公司项目(2020-C4011)联合资助。

摘　　要：提要准噶尔盆地西北缘玛湖凹陷风城组主要形成于碱湖环境,含有优质生烃母岩。对玛页1井风城组岩心样品的孢粉分析建立了Protohaploxypinus perfectus–Lunatisporites tersus (PT)孢粉组合。该组合包括20属29种孢粉化石。PT组合以双气囊具肋花粉占主导,蕨类孢子含量很低为特征;孢粉母体植物类群以裸子植物门种子蕨盾籽目为主,其次为松柏纲松柏目。该组合与准噶尔盆地南缘塔什库拉组上部至乌拉泊组的Crustaesporites–Protohaploxypinus–Hamiapollenites孢粉组合可以对比,均以双气囊具肋花粉为主要特征,又同时出现重要的属种Gardenasporites bilabiatus,Triangulisaccites boleensis和Hamiapollenites saccatus。孢粉地层学和同位素年代学资料表明,玛页1井风城组PT组合的时代很可能属于石炭纪宾夕法尼亚亚纪卡西莫夫期至二叠纪乌拉尔世阿瑟尔期,玛湖凹陷区整个风城组沉积时代晚于宾夕法尼亚亚纪巴什基尔期,其上部可能包含部分乌拉尔世阿瑟尔期沉积。风城组黑色页岩中产出的双气囊具肋花粉占绝对优势的孢粉组合和冷水古鳕类化石,与互层状盐碱层中自生矿物碳镁钠石和碳酸钠钙石共同表明风城组页岩和盐碱韵律沉积很可能形成于冷干和暖干频繁交替的古环境中。The Fengcheng Formation in the Mahu sag in northwestern Junggar Basin, Xinjiang, was deposited in an alkaline saline lake and contains large volumes of high-quality source rocks. PetroChina Xinjiang Oilfield Company conducted the Maye-1 borehole project and collected the entire sequence of the Fengcheng Formation in the Mahu sag to evaluate and explore the oil and gas potential in this area. In order to better constrain the age of the Fengcheng Formation, a palynostratigraphic project has been conducted since 2019. A total of fifty palynological samples, mainly of shale, claystone and siltstone, were collected from the Maye-1 core. All samples were cleaned, crushed, weighed(30-50 g for each sample), and macerated following the standard HCl-HF-HCl method. The organic residues were sieved through 180 and 10 μm meshes, respectively. The residues were then mounted on microscope slides using glycerin jelly. Palynomorphs were observed and photographed using a LEICA DM 2500 microscope equipped with a D800E camera. However, a considerable number of palynomorphs are not well preserved, usually with various sizes of secondary cavities or perforations. All slides are stored in the PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang, China. Positions of the spores and pollen illustrated in the text figures are located using an England Finder Slide.Based on systematic palynological identification and statistics, a new fossil palynological assemblage, Protohaploxypinus perfectus-Lunatisporites tersus(PT) assemblage, is established for the Fengcheng Formation. Twenty-nine species in twenty genera of spores and pollen were recognized in the PT Assemblage from fifty macerated samples. In the PT assemblage, the Disaccites striatiti pollen is dominant, while the fern spores are relatively rare. The comparison of the dispersed and in-situ spores and pollen associated with their reliable parent plants shows that the palynoflora consists of dominant species of Peltaspermales and species of Coniferales as the second major componen

关 键 词：风城组 孢粉学 宾夕法尼亚亚系 乌拉尔统 准噶尔盆地 古气候 

分 类 号：Q913.84[天文地球—古生物学与地层学]