Research on the Occurrence State of Methane Molecules in Postmature Marine shales—A Case Analysis of the Lower Silurian Longmaxi Formation Shales of the Upper Yangtze Region in Southern China

Zhang, Kun; Song, Yan; Jiang, Zhenxue; Yuan, Xuejiao; Han, Fengli; Zhang, Liwen; Tang, Liangyi; Liu, Pei; Yang, Yunjie; Zeng, Yifeng; Chen, Xuecheng; Zheng, Zehao

doi:10.3389/feart.2022.864279

Cited by 10 publications

(9 citation statements)

References 61 publications

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“…A number of wells in the study area are selected to test the Leping formation physical characteristics by the nuclear magnetic resonance technology (NMR). The results showed that the Leping Formation carbonaceous shale gas reservoir in the study area has high porosity and relatively low permeability (Shan et al, 2015;Zhang et al, 2020c;Zhang et al, 2022a;Zhang et al, 2022b;Zhang et al, 2022c). The total porosity of mud shale ranges from 7.7 to 10.4% (Figure 8), and the permeability is generally less than 0.10 mD, with an average of about 0.005 mD.…”

Section: Physical Characteristicsmentioning

confidence: 84%

Reservoir Characteristics and Resource Potential Analysis of Transitional Shale Gas in Southern Sichuan Basin

Shan

Ye²,

Zhang³

et al. 2022

Front. Earth Sci.

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Natural gas is a clean and efficient energy source. Shale gas, one of the unconventional natural gases, is becoming an indispensable part of natural gas. Compared with marine facies shale gas, which has large-scale exploitation, marine and continental transitional facies shale gas have greater development potential. It could be the new direction of development in the future. In this article, the basic geological characteristics, sedimentary environment, and reservoir characteristics of organic-rich transitional facies shale in the southern Sichuan basin are analyzed by lithologic characteristics, chemical element analysis, reservoir space, gas bearing characteristics, and so on and are compared with domestic and abroad transitional shale gas. The results show that the sedimentary period of transitional shale of Upper Permian Leping Formation has a high paleoproductivity level and deposition rate favorable for the accumulation of organic matter in southern Sichuan basin. It was warm and humid paleoclimatic by Sr, V, Cr, Ni, Co, and other trace elements analysis. According to the experimental test analysis of reservoir characteristics, the organic matter is mainly type Ⅲ kerogen, and the thermal evolution degree is mainly overmature in the reservoir. The reservoir space is mainly of microfractures and micropores. The main types of micropore development are intergranular pore, intragranular pore, and organic pore. Compared with other shale gas regions that form industrial airflow, the study region with large thickness, highly brittle mineral content, high level of organic carbon content, and excellent gas-bearing characteristics, it has favorable conditions for shale gas accumulation. The southern Sichuan basin could be the key area for breakthroughs in the exploration and development of transitional shale gas in the next step.

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Section: Physical Characteristicsmentioning

confidence: 84%

Reservoir Characteristics and Resource Potential Analysis of Transitional Shale Gas in Southern Sichuan Basin

Shan

Ye²,

Zhang³

et al. 2022

Front. Earth Sci.

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“…Frontiers in Earth Science frontiersin.org technology of FIB-SEM which can help identify the mineral composition, the type of shale micro-nanometre pores can be effectively determined (Zhang et al, 2019c;Li et al, 2021c;Zhang et al, 2022d;Zhang et al, 2022e). In this study, FIB-SEM observation was carried out using an instrument of FEI HELIOS NANOLAB 650 SEM.…”

Section: Fib-sem Observationmentioning

confidence: 99%

Study on characteristics of oil and gas occurrence and reservoir space of medium-high maturity continental shale—A case study of middle jurassic lianggaoshan formation in fuling block, southeast of sichuan basin, south China

et al. 2022

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Possessed of easy access to development and fair economic benefits, medium-high maturity continental shale oil and gas have become the focus of shale oil and gas study in the future. Shale oil and gas mainly occur in pores, but studies on the pore characteristics of shale oil and gas occurrence are by no means sufficient. Focused on shale from the Middle Jurassic Lianggaoshan Formation in Well TYX, Fuling block, southeast of Sichuan Basin where a breakthrough in shale oil and gas exploration was recently achieved, this study selects core samples and conducts a series of analyses, including vitrinite reflectance analysis, kerogen microscopic examination experiment, total organic carbon (TOC) content analysis, mineral composition analysis, gas content measurement, isothermal adsorption experiment, S1 content analysis, and others. The analyses are to identify the pore characteristics of the continental medium and high maturity shale oil and gas by virtue of scanning electron microscope (SEM) with Ar-ion milling and the image processing software ImageJ. The conclusions are drawn as follows: in terms of lithofacies, medium-high maturity continental shale oil and gas mainly occur in organic-rich clay shale and organic-rich mixed shale; with regard to material composition, shale oil and gas mainly occur in organic matter, illite-smectite mixed layers and illite. Shale adsorbed gas content accounts for at most 40% of the total shale gas content and shale free gas content takes up at least 60% of the total shale gas content. Pores of solid bitumen, solid bitumen-clay mineral complex mass, clay minerals, structured vitrinite, and funginite are mostly developed in shale. Among them, the first three types of pores are the main reservoir space in shale considering their large number, good roundness, medium pore diameter, fairly good roundness of pore edges, and the complex shapes which altogether contribute to the large surface porosity.

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“…This finding thus provides a direction for the exploration and development of oil and gas fields and the prediction of favorable reservoir zones in the Tazhong region within the Tarim basin. Urey, 1948, Kuypers et al, 1999, Li, 2022a, Li et al, 2019, Li et al, 2022b, Zhang et al, 2022a, Zhang et al, 2022b, Zhang et al, 2022c, Zhang et al, 2022d, Fan et al, 2022.…”

Section: Geological Significancementioning

confidence: 99%

“…These have generally undergone long periods of geological and environmentally driven changes, including repeated dissolution and filling caused by various factors and fluids. These reservoirs are characteristically very deeply buried, tectonically complex and highly heterogeneous (Li et al, 1996;Zhu et al, 2005), thus causing immense difficulties in predicting the location and character of deeply buried carbonate paleokarst reservoirs (Li, 2022a;Li et al, 2019;Li et al, 2022;Li et al, 2022b;Zhang et al, 2022a;Zhang et al, 2022b;Zhang et al, 2022c;Zhang et al, 2022d).…”

Section: Introductionmentioning

confidence: 99%

Isotopic characteristics of carbon and oxygen within ordovician carbonate paleokarst in the tazhong region and their paleoenvironmental significance

Liu¹,

Ji²,

Li³

2023

Front. Earth Sci.

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The Tazhong region is a key area for oil and gas exploration and development within the Tarim basin. In this region, development of Ordovician carbonate paleokarsts has been found to be extremely heterogeneous. To investigate the developmental stages of these Ordovician carbonate karsts and their corresponding paleoenvironmental conditions, oxygen and carbon isotopic characteristics of calcite paleokarst fissure fillings were examined in conjunction with rock-structure analyses. Results show that δ18O (PDB) values tend towards negative values in general, ranging from −3.97% to −12.7% (average value −7.64%), which is indicative of the presence of paleokarstification via dissolution by atmospheric freshwater. Values of δ13C (PDB) span a relatively large range, from 2.48% to −2.13% (average value of 0.23%). This shows that the paleokarst in this area has gone through two stages of supergene and burial diagenesis, and the process of paleokarst is complex. The paleotemperature at which the karst fissure-filling deposits were formed ranged from 6.5 to 47.1°C (average value of 21.8°C), and the salinity of the medium has Z values from 117.48 to 130.24 (average value of 123.94). Four different paleokarsification settings were thus revealed: a marine depositional environment, an atmospheric freshwater karst-filling environment, a shallow-burial paleokarsification environment and a deep-burial high-temperature environment. It has thus been shown that the karst pores, fissures and caves formed by paleokarstification over multiple stages are the main reservoir spaces in this region. This study will serves as a basis for karst reservoir predictions, and exploration and development in this region.

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Research on the Occurrence State of Methane Molecules in Postmature Marine shales—A Case Analysis of the Lower Silurian Longmaxi Formation Shales of the Upper Yangtze Region in Southern China

Cited by 10 publications

References 61 publications

Reservoir Characteristics and Resource Potential Analysis of Transitional Shale Gas in Southern Sichuan Basin

Reservoir Characteristics and Resource Potential Analysis of Transitional Shale Gas in Southern Sichuan Basin

Study on characteristics of oil and gas occurrence and reservoir space of medium-high maturity continental shale—A case study of middle jurassic lianggaoshan formation in fuling block, southeast of sichuan basin, south China

Isotopic characteristics of carbon and oxygen within ordovician carbonate paleokarst in the tazhong region and their paleoenvironmental significance

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