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Ichnofabrics and Their Environmental Interpretation from the Fluvial Deposits of the Middle Triassic Youfangzhuang Formation in Western Henan, Central China

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Journal of Earth Science 2014年第4期25卷 648-661页

作者： Min Wang yongan qi Da Li Mingyue Dai Yuguang Chang Institute of Resources and Environment Henan Polytechnic University

Fluvial deposits from the Middle Triassic Youfangzhuang Formation in Henan Province, China contain a low-diversity trace fossils. Vertical dwelling burrows of opportunists dominate in active channel, whereas horizontal deposit-feeding, grazing, and vertical dwelling burrows occur in overbank deposits. Seven recurrent ichnofabrics were distingushed. The Palaeophycus tubularis ichnofabric pre- serves below scour interface between two fluvial cycles. The Skolithos linearis ichnofabric forms in middle to high-energy, soft substrates in the middle and upper parts of active channel deposits under semi-arid climate. The Skolithos linearis-Planolites montanus ichnofabric occurs in the sediments just a little above the Skolithos linearis ichnofabric and is formed in middle-energy, soft substrates in the up- per part of active channel deposits. The Planolites montanus ichnofabric is mostly preserved in associa- tion with medium- to thick-bedded brown-red silty mudstones or siltstones in low-energy, perennial muddy bottom ponds in overbank settings. The Taenidium barretti ichnofabric is interpreted as peri- odically exposed ephemeral ponds or low-energy distal floodplain. The Skolithos isp. ichnofabric com- monly occurs in middle to high-energy firm ground of proximal foodplain or crevasse-splay deposits. The root trace iehnofabric occurs in the crevasse splay deposits. The presence of thin palaeosols and the abundance of calcretization in mudstones indicate a seasonal climate ranging from humid to semi-arid, with high temperature, rainfall, and well-defined dry and wet seasons.

关键词： trace fossil ichnofabric fluvial deposit environmental interpretation Middle Triassic Youfangzhuang Formation.

The influence of bioturbation on sandy reservoirs: the delta front sand of the lower Zhujiang Formation, Baiyun Depression, Zhujiang River Mouth Basin

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Acta Oceanologica Sinica 2023年第9期42卷 27-43页

作者： Zhifeng Xing Wei Wu Juncheng Liu yongan qi Wei Zheng The Institute of Resources and Environment Henan Polytechnic UniversityJiaozuo 454000China Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Mineral Shandong University of Science and TechnologyQingdao 266590China

Ichnofossils are well developed in clastic rock reservoirs in marine and transitional facies, which can considerably change the physical properties of the reservoir. However, this influence is not well understood, raising an important problem in the effective development of petroleum reservoirs. This paper analyzes continental shelf margin delta reservoirs through core observation, cast thin section observation and reservoir physical property test. Some important scientific insights are obtained:(1) The presence of Cruziana ichnofacies, including Asterosoma, Ophiomorpha, Planolites, Skolithos, Thalassinoides, and other ichnofossils can be used to identify in subaqueous distributary channels, subaqueous levee, frontal sheet sand, abandoned river channels, crevasse channels, main channels and channel mouth bars. Considerable differences in the types of ichnofossils and the degree of bioturbation can be observed in the different petrofacies.(2) Ichnofossils and bioturbation play a complex role in controlling reservoir properties. The reservoir physical properties have the characteristics of a decrease–increase–decrease curve with increasing bioturbation degree. This complex change is controlled by the sediment mixing and packing of bioturbation and the diagenetic environment controlled by the ichnofossils.(3) Sea-level cycle changes affect the modification of the reservoir through sediment packing. Bioturbation weakens the reservoir's physical property when sea level slowly rises and improves the reservoir's physical property when base level slowly falls.

关键词： bioturbation reservoir physical properties sedimentary petrofacies shelf margin delta Baiyun Sag

Microbial and molecular fossils from the Permian Zoophycos in South China

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Science China Earth Sciences 2007年第8期50卷 1121-1127页

作者： GONG YiMing XU Ran XIE ShuCheng HUANG XianYu HU Bin qi yongan ZHANG GuoCheng Key Laboratory of Biogeology and Environmental Geology of Ministry of Education State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan 430074China Institute of Resources and Environment Key Laboratory of Biogenic Traces&Sedimentary Minerals of Henan ProvinceHenan Polytechnic UniversityJiaozuo 454003China

The trace fossil Zoophycos was enriched in the lower part of the Guadalupian Maokou Formation of Permian in Laibin, Guangxi of South China, and characterized by observable lamellae within its spreiten. Associated with these lamellae are the prolific coccus- and spirillum-shaped microbe fossils. These microbes morphologically identified are 0.4―3.0 μm in diameter or length. Molecular fossils, including normal alkanes (dominated by C18, without an odd-over-even predominance), acyclic isoprenoids (such as pristane (Pr) and phytane (Ph)), extended tricyclic terpanes, pentacyclic triterpanes, steranes, al-kylcyclohexanes, dibenzothiophenes, benzonaphthothiophenes, benzobisbenzothiophenes, were in-strumentally identified in the wackestone characterized by the occurrence of abundant Zoophycos (composite ichnofabric indices are 4) and crowded microbial fossils. The value of the Pr/Ph ratio is less than 1, indicative of a dysoxic condition. The identification of abundant sulfur compounds (the thio-phene series) related to the contribution of reductive sulfur favors the occurrence of sulphate-reducing bacteria. The association of abundant microbial colonies with microbial molecular fossils within the spreiten suggests that trace fossils Zoophycos would be a multifunctional garden carefully constructed by the Zoophycos-producer, where different microbial colonies were orderly and carefully planted and cultured in different minor lamellae within spreiten. Hence, it is proposed that the Zoophycos-producer symbiosed with microbial colonies on the mutual basis of food supply and the redox conditions.

关键词： trace fossils Zoophycos microbes molecular fossils Permian South China

华北上石炭统太原组灰岩中的Zoophycos痕迹组构

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煤田地质与勘探 2000年第1期28卷 12-15页

作者：胡斌齐永安焦作工学院 454000

应用痕迹组构的分析方法 ,概要论述了华北沉积地层区上石炭统太原组灰岩中的痕迹化石产状特征和痕迹组构的主要组成特征。结合沉积学分析 ,首次提出了五种组构类型 :类型 A—Zoophycos占绝对优势 ,分异度低 ,生物扰动强度为 2级 ,常见... 详细信息

应用痕迹组构的分析方法 ,概要论述了华北沉积地层区上石炭统太原组灰岩中的痕迹化石产状特征和痕迹组构的主要组成特征。结合沉积学分析 ,首次提出了五种组构类型 :类型 A—Zoophycos占绝对优势 ,分异度低 ,生物扰动强度为 2级 ,常见于泻湖或水体较宁静的海湾环境 ;类型 B—以 Thalassinoides和 Zoophycos为主 ,分异度和丰度都较高 ,生物扰动强度为 3级 ,属正常天气浪基面和风暴浪基面间的上部沉积环境 ;类型 C—痕迹化石丰度较高 ,常见有 Zoophycos、Tha lassinoides、Planolites、Taenidium、Palaeophycos和 Teichichnus等 ,可分辨出 4个阶梯 ,生物扰动强度为 3～ 4级 ,形成于正常天气浪基面至风暴浪基面间的下部沉积环境 ;类型 D—主要由 Zoophycos和 Chondrites组成 ,丰度高 ,但分异度低 ,生物扰动强度为 5级 ,产生于风暴浪基面附近或较闭塞的环境 ;类型 E—生物扰动极强 ,扰动指数为 2 6 ,偶而可识别出 Zoophycos和 Chondrites,可能属局限河口湾下部或风暴浪基面之下的沉积环境。

关键词：痕迹化石痕迹组构灰岩太原组华北区

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新时期甘肃粮食生产战略选择

开发研究 2006年第5期 16-18页

作者：祁永安简富缋西北民族大学经济管理学院兰州730030 甘肃省经济研究院兰州730000

粮食安全生产不仅是一个经济问题,更重要的是一个战略问题。本文通过对解放以来甘肃粮食生产的周期性变化分析得到:甘肃粮食生产可以分为四个时期,现在正处于第四个增长通道之中;应用COBB-DOUGLAS生产函数模型分析了粮食播种面积、灾害... 详细信息

粮食安全生产不仅是一个经济问题,更重要的是一个战略问题。本文通过对解放以来甘肃粮食生产的周期性变化分析得到:甘肃粮食生产可以分为四个时期,现在正处于第四个增长通道之中;应用COBB-DOUGLAS生产函数模型分析了粮食播种面积、灾害发生、劳动力投入及农业科技对粮食生产的贡献率。提出未来甘肃粮食生产必须“立足于省内粮食生产总量平衡,以粮食生产的专业化和产业化生产为主体,以科技为支撑,以粮食单产的有效提高为目标,增强全省粮食综合生产能力”的战略。

关键词：粮食生产战略可持续发展

明确少数民族事业内涵,重构“十二五”建设重点

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西北民族大学学报（哲学社会科学版） 2012年第2期 21-27页

作者：祁永安西北民族大学经济学院甘肃兰州730030

少数民族是我国一个独特的发展单元。推进少数民族事业的发展,需要进一步明确少数民族事业的内涵。根据其内涵,"十二五"所面临的形势与任务和我国少数民族地区的实际,制定其发展重点。本文应用区域发展规划一般理论,重构了我国少数民族... 详细信息

少数民族是我国一个独特的发展单元。推进少数民族事业的发展,需要进一步明确少数民族事业的内涵。根据其内涵,"十二五"所面临的形势与任务和我国少数民族地区的实际,制定其发展重点。本文应用区域发展规划一般理论,重构了我国少数民族事业"十二五"发展重点,可为政府部分制定规划提出决策参考。

关键词：少数民族事业 “十二五”规划发展战略

Calcite Cements in Burrows and Their Influence on Reservoir Property of the Donghe Sandstone, Tarim Basin, China

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Journal of Earth Science 2012年第2期23卷 129-141页

作者：齐永安王敏郑伟李妲 Institute of Resources and Environment Henan Polytechnic University Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province Henan Polytechnic University

Abundant burrows of Skolithos linearis, Palaeophycus tubularis, and Taenidium barretti are preserved in the Upper Devonian Donghe sandstone of Tarim basin, China. They are commonly highlighted in core by the color of the burrow fill in contrast to the surrounding matrix and have dif-ferent textures and fabrics from the matrix. There are three kinds of calcite cements in burrows, microcrystalline-crystalline calcite cement, mosaic calcite cement, and ferroan calcite cement. Microcrystalline-crystalline calcite cement is widely distributed in the lower part of the Donghe sand-stone, but it is rare in burrows filling. It displays a globule structure under burial cementation and sel-dom replaces the quartz grains in shallow burial depth stage. Mosaiccalcite cement is widespread in the Donghe sansdtone reservoir of North Tarim basin. It shows chrysoidine, orange and bright orange lu-minescence, and intensely replaces the quartz grains, forming in early diagenetic and shallow burial depth stage. Ferroan calcite is asymmetrically distributed in the Donghe sandstone reservoir of Central Tarim basin. It fills the remanent pores in the shape of mosaic and replaces the quartz grains, matrix, and early calcite cement, forming in late diagenetic and deep burial depth stage. The burrows filled with white calcite cements have low oil saturation or may be oil-stained. In contrast, there is high oil saturation in the sandstone reservoir where the bioturbation is sparse or not present. With increased bioturbation, the porosity, permeability, and oil saturation decrease; thus, bioturbation intensity and reservoir property appear to be negatively correlated.

关键词： burrow calcite cement Donghe sandstone reservoir property.