formation of limestone in sichuan

Origin of dolomite of the lower Cambrian Longwangmiao …

2017-11-17 · The Longwangmiao Formation (55–270 m thick) in the eastern Sichuan Basin conformably overlies the Canglangpu Formation (gray-green muddy siltstone, red mudstone, gray sandstone) and is conformably overlain by the Gaotai Formation (siltstone, limestone, gypsum, and diamictite) (Figs. 1b, 2a, b). The lower part of the Longwangmiao Formation ...

The formation of limestone rocks

2020-9-4 · The limestone rock formed in the dissolution of karst landscape is the dominant rock in the Xingwen Karst Geological Park discussed in the previous site location. Limestone is a sedimentary rock majorly constituted by calcium carbonate. Limestone rocks in the karst landscape have incrementally created over a million years through rock formation processes …

Geochemistry, Paleoenvironment, and Mechanism of …

2019-5-16 · Fushun-Yongchuan, Zhaotong and Weiyuan areas of the Sichuan Basin (Zhai et al., 2018; Zou et al., 2018). Although the Longmaxi Formation shale is generally considered to have been deposited in an oxygen-deprived deep-sea environment, the abundance of organic matter in the Longmaxi Formation shale shows strong vertical

Petrology and geochemical characteristics of dolomite

2017-12-1 · 1. Introduction. The Middle Permian Maoukou Formation was as a key hydrocarbon-bearing series in the Sichuan Basin, most of researches concentrated on epigenetic karst and relevant reservoirs formed by the Dongwu Movement (Chen, 2007, Hong et al., 2012, Jiang et al., 2013); for the Middle Permian dolomitization and its relevant reservoirs, most of studies mainly …

Sedimentary facies and sequence stratigraphy in the Lower …

2018-9-25 · The Lower Triassic Jialingjiang Formation is an important oil and gas exploration target in the Sichuan Basin. The lithofacies mainly consists of clastic rocks, carbonates, and evaporates, which represents a transition from continental to marine depositional environment. The Jialingjiang Formation of the Sichuan Basin is a typical epeiric carbonate platforms. The …

The pore structure of tight limestone—Jurassic Ziliujing …

PDF | The pore structure of the tight limestone in the Daanzhai Member of the Ziliujing Formation, Jurassic System, in central Sichuan Basin, China, is... | Find, read and cite all the research ...

The formation of the Sichuan Basin, South China, during …

2021-2-15 · The shape of the subsidence curves is consistent with formation of the Sichuan Basin by low, and slow amounts of lithospheric stretching of thickened cratonic lithosphere. The tectonic subsidence increases from the centre to the NW of the basin. Interestingly the margins of the trough do not correlate with contoured values of increased tectonic ...

Characteristics of fracture propagation in compact …

2018-6-1 · Compact limestone formations are significant and serve as enrichment petroleum sources in the central Sichuan basin. However, they are difficult to stimulate by hydraulic fracturing owing to their ...

Environmental Geology of Limestone in Malaysia

2017-6-16 · limestone formation which has been degraded/dissolved, and the collapse of the limestone cliffs contributes to the reduction in the size of the limestone hills. In a previous survey of the limestone hills in the Kinta Valley, for example, some 40 limestone hills of various sizes have been recorded (Tan, 1988). While some

GIANT OOLITIC LIMESTONE IN THE LOWER TRIASSIC …

As one of the anachronistic deposits, giant oolitic limestones have been found in Early Triassic strata of South China. Why did the giant oolitic limestone reappear in the Early Triassic since its disappearance in the Cambrian? Giant oolitic limestone occurs in the Lower Triassic Feixianguan Formation at the Yudongzi Section, Jiangyou, Sichuan Province.

The genesis of nodular limestone reservoirs of the first …

Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (6): 806-815. doi: 10.11764/j.issn.1672-1926.2021.02.005. Previous Articles Next Articles The genesis of nodular limestone reservoirs of the first period of Maokou Formation of Permian in southern Sichuan Basin

Differential diagenetic evolution and hydrocarbon …

2020-10-30 · The tight lacustrine carbonate reservoir of the Da''anzhai Member, Lower Jurassic Ziliujing Formation, in the central Sichuan Basin is a typical tight oil reservoir, and it is one of the crucial petroleum exploration targets in the Sichuan Basin. The porosity of the limestone ranges from 0.5% to 2%, and the permeability ranges from 0.001 to 1 mD.

Organic geochemistry, sedimentary environment, and …

2021-12-1 · Limestone-marlstone (LM-MR) rhythms widely develop in the middle Permian Maokou Formation of Sichuan basin, and they are regarded as potential source rocks and important shale gas targets due to their high organic matter contents. In this study, LM-MR rhythms in the lower part of the Maokou Formation in the Changjianggou section of the …

A new type of unconventional gas reservoir from the nodular …

Tectonic evolution of the Sichuan Basin, Southwest China

The pore structure of tight limestone—Jurassic Ziliujing …

The pore structure of the tight limestone in the Daanzhai Member of the Ziliujing Formation, Jurassic System, in central Sichuan Basin, China, is complex but essential to the exploration and development of tight oil. The pore structure of the tight limestone is studied by using scanning electron microscopy (SEM), nitrogen adsorption, high-pressure mercury intrusion, and nuclear …

Differential Diagenetic Evolution and Hydrocarbon …

The marine shale of the Silurian Longmaxi Formation in southern Sichuan Basin, China is characterized by its huge thickness (100–600 m), high TOC values (0.35–18.4%), favorable types of ...

The Basics of Limestone Formation | Actforlibraries

The Basics of Limestone Formation. Limestone is a sedimentary rock composed of calcium carbonate (CaCO3). Calcite and aragonite are crystal forms of CaCO3. Limestone makes up approximately 10 percent of all the sedimentary rocks in the world. Limestone may form many erosional land formations when in contact with acid.

The formation of the Sichuan Basin, South China, during …

2021-1-31 · The formation mechanism of the early Sichuan Basin remains enigmatic, but due to the intense hydrocarbon ex- ploration of the last two decades (e.g. Fu et al., 2020; Zhu

Identification of fractures in tight-oil reservoirs: a case …

2021-12-13 · The Da''anzhai Member of the Jurassic Ziliujing formation in central Sichuan is a typical tight-oil reservoir with porosity and permeability less than 2% and 0.1 × …

Differential diagenetic evolution and hydrocarbon

2020-12-17 · Abstract The tight lacustrine carbonate reservoir of the Da''anzhai Member, Lower Jurassic Ziliujing Formation, in the central Sichuan Basin is a typical tight oil reservoir, and it is one of the crucial petroleum exploration targets in the Sichuan Basin. The porosity of the limestone ranges from 0.5% to 2%, and the permeability ranges from 0.001 to 1 mD. The …

Limestone

2022-7-1 · Pennsylvania and Permian limestones of eastern Kansas are partially formed by algae. Oolitic limestone – A limestone composed mainly of calcium carbonate Oolites. Oolite or egg stone is a sedimentary rock formed from ooids, spherical grains, or shell particles (less than 2 mm in diameter) coated with calcite.

The quantitative characterization of stylolites in the …

2022-5-1 · The northeastern Sichuan Basin located in the northern margin of the Yangtze Plate has many large gas fields, such as the Yuanba and Longgang Gas Fields (Huang, 2014) ().The Yuanba Gas Field, with its reserves of more than 1000 × 10 8 m 3 has a present burial depth of about 7000 m (Liu et al., 2017) the Early Triassic period, it was a ramp platform developed …

Limestone | Types, Properties, Composition, Formation, Uses

Carboniferous Limestone. Coquina – A sedimentary rock that is composed mostly of fragments of shells. Coral rag. Chalk – A soft, white, porous sedimentary rock made of calcium carbonate. Fossiliferous limestone. Lithographic limestone. Oolite – Sedimentary rock formed from ooids. Rag-stone – Work done with stones that are quarried in ...

(PDF) Carbonate diagenetic products and processes from …

2017-6-1 · Carbonate diagenetic products and processes from various diagenetic environments in Permian paleokarst reservoirs: a case study of the limestone strata of Maokou formation in Sichuan Basin, South ...

GIANT OOLITIC LIMESTONE IN THE LOWER TRIASSIC …

Giant oolitic limestone occurs in the Lower Triassic Feixianguan Formation at the Yudongzi Section, Jiangyou, Sichuan Province. The authors observed thin sections of the giant oolitic limestone using light microscopy and scanning electron microscopy(SEM) and discovered putative benthic cyanobacteria, coccoid plankton cyanobacteria ...

Characteristic of the Lowest Member of the Feixianguan ...

Characteristic of the Lowest Member of the Feixianguan Formation "Bead like" Limestone in the Majiaoba Area, Northwestern Sichuan Province, and Its Implications WANG Xia 1, ZOU Hao 1,2, MA Cheng-long 3, ZHANG Qiang 1, CHEN Heng-qiang 1, HU Ning-ning 4

FORMATION ENVIRONMENT OF TRIASSIC EVAPORATE …

The strata thickness from Second Member of Jialingjiang Formation to Leikoupo Formation in the Sichuan Basin is over 1 500 m is composed of dolostone,anhydrite,halilith and interbedded limestone,among which the dolostone is one of the main gas reservoirs in the basin the early Jialingjiang stage,the mountain system around the Sichuan Basin keeps uplifting,and the base …

(PDF) Carbonate diagenetic products and processes from …

2017-6-1 · Main microfacies of marnine carbonate in the Permian Maokou Formation: a micritic limestone with calcite cement, MF-1, Lintanchang section; b micritic limestone with augen structure, MF-1, Zaodu ...

Oxygen and Carbon Isotopic Composition of …

Moreover, the Qixia Formation in the Changjianggou section in Jian''ge area, northwestern Sichuan, is generally of dark grey limestone, with grey dolomitic limestone forming the upper part . It is widely thought that the black Qixia was …

GEOLOGY AND UTILIZATION OF YANGXIN FORMATION …

2020-6-30 · GEOLOGY AND UTILIZATION OF YANGXIN FORMATION LIMESTONE IN LONGMENSHAN AREA, SICHUAN PROVINCE: LIU Liang, HAN Hong-ming, YANG Peng-tao, YANG Yu-dong, DAI Yuan, CHEN Na, XU Tao: Northwest Sichuan Geological Team, Sichuan Bureau of Geology and Mineral Resources, Mianyang 621010, Sichuan Province, China

Microfacies of Peloidal Limestone of Middle Permian …

Carbonate shoal develops in the middle part of Chihsia Formation at Shangsi Section of Guangyuan,Sichuan Province.The outcrop consists predominantly of thick bedded to massive limestone with intercalated dolostone.The rocks are light grey and crystalline,with some fossil fragments.Under microscope,abundant peloids and cortoids were identified.The peloids are …

GEOLOGY AND UTILIZATION OF YANGXIN FORMATION ...

Abstract: The limestone of Yangxin Formation,Permian,is 240-350 m thick with the strike extension more than 50 km,exposed area over 15 km 2 and abundant resource reserves. The resources is 51.93 Mt within a 0.6 km 2 range of the study area.

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(PDF) The Diagenetic Alteration of the Carbonate Rocks …

2021-10-29 · The Diagenetic Alteration of the Carbonate Rocks from the Permian Qixia Formation as Response to Two Periods of Hydrothermal Fluids Charging in the Central Uplift of Sichuan Basin, SW China

How Limestone is Formed

Limestone Formation. Limestone is any rock that is made mostly from calcium carbonate, but there are several types. It forms with carbonate rocks were deposited in seawater and continue to form as coral reefs in shallow seas. …