华南北部四川盆地下寒武统龙王庙地层中的斑状白云岩

IF 4.2 Q2 ENERGY & FUELS
Xuefei Yang , Hao Tang , Junyi Zhang , Yao Du , Ruifeng Tang , Shuang Pan , Xiang Zhou , Yan Xu
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引用次数: 0

摘要

早寒武世末期,四川盆地(华南)位于宽阔的碳酸盐岩平台上,沉积了数百米的碳酸盐岩。四川盆地龙王庙地层碳酸盐岩部分至全部白云化,在出露的北部地区呈斑驳状纹理。斑驳的白云质石灰岩与层理平行发育,与未白云化的石灰岩边界形状不规则。斑驳白云石由粉晶和细晶白云石组成,而基质石灰岩则由微晶方解石组成。斑驳白云石的同位素组成(δ13C = +0.29‰PDB,δ18O =-1.15‰PDB)与微晶方解石的同位素组成(δ13C = -0.49‰PDB,δ18O =-1.45‰PDB)相似。同位素值和微量元素数据都表明,白云岩化流体来源于海水。一些岩床含有石膏假象和泥裂缝,表明沉积时处于浅层蒸发环境,局部盐度较高。白云石化很可能发生得很早,部分原因是海水盐度集中。龙王庙地层中发育有微量化石水平铊、胼胝铊和刨花石,斑驳白云岩的尖锐边缘与这些微量化石相似。床层生物扰动强烈。在洞穴网络中,沉积物和洞穴填充物粗而松散,粘土很少,因此这里的沉积物比周围的沉积物更容易白云石化。因此,部分白云石化被解释为发生在洞穴系统中,白云石化的程度与生物扰动的程度有关,而生物扰动的程度是由造迹生物控制的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mottled dolomite in the lower Cambrian Longwangmiao formation in the Northern Sichuan Basin, South China

At the end of Early Cambrian time, the Sichuan basin (South China) was located in a wide carbonate platform, with hundreds of meters of carbonate deposited. The Longwangmiao Formation carbonate in Sichuan basin is partially to completely dolomitized, displaying a mottled texture in the northern area of the exposure. The mottled dolomitic limestone developed parallel to bedding, with shape irregular boundaries with limestone that has not been dolomitized. The mottled dolomite is composed of powder crystalline and finely crystalline dolomite, while the matrix limestone is composed of micritic calcite. the isotopic composition of mottled dolomite (δ13C = +0.29‰PDB, δ18O = −1.15‰PDB) is similar to that of micrite calcite (δ13C = −0.49‰PDB, δ18O = −1.45‰PDB). Both isotopic values and trace element data indicate that the dolomitized fluid is originated from sea water. Some beds contain gypsum pseudomorphs and mud cracks, indicating a shallow and evaporative environment with local high salinity during deposition. Dolomitization likely took place early, in part as a result of sea water salinity concentration. Trace fossils thalassinoides horizontalis, thalassinoides callianassa and planolites developed in the Longwangmiao Formation, and the sharp edges of mottled dolomite are similar to these trace fossils. The beds are intensely bioturbated. In the burrow network, the sediments and burrow fill were coarse and loose with little clay, and it is interpreted here as being easier to be dolomitized than the surrounding sediments. Partial dolomitization is thus interpreted to have occurred in the burrow system, and the degree of dolomitization was related to the degree of bioturbation, which is controlled by the trace-making creatures.

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来源期刊
Petroleum
Petroleum Earth and Planetary Sciences-Geology
CiteScore
9.20
自引率
0.00%
发文量
76
审稿时长
124 days
期刊介绍: Examples of appropriate topical areas that will be considered include the following: 1.comprehensive research on oil and gas reservoir (reservoir geology): -geological basis of oil and gas reservoirs -reservoir geochemistry -reservoir formation mechanism -reservoir identification methods and techniques 2.kinetics of oil and gas basins and analyses of potential oil and gas resources: -fine description factors of hydrocarbon accumulation -mechanism analysis on recovery and dynamic accumulation process -relationship between accumulation factors and the accumulation process -analysis of oil and gas potential resource 3.theories and methods for complex reservoir geophysical prospecting: -geophysical basis of deep geologic structures and background of hydrocarbon occurrence -geophysical prediction of deep and complex reservoirs -physical test analyses and numerical simulations of reservoir rocks -anisotropic medium seismic imaging theory and new technology for multiwave seismic exploration -o theories and methods for reservoir fluid geophysical identification and prediction 4.theories, methods, technology, and design for complex reservoir development: -reservoir percolation theory and application technology -field development theories and methods -theory and technology for enhancing recovery efficiency 5.working liquid for oil and gas wells and reservoir protection technology: -working chemicals and mechanics for oil and gas wells -reservoir protection technology 6.new techniques and technologies for oil and gas drilling and production: -under-balanced drilling/gas drilling -special-track well drilling -cementing and completion of oil and gas wells -engineering safety applications for oil and gas wells -new technology of fracture acidizing
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