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Ningsheng Chen - One of the best experts on this subject based on the ideXlab platform.
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china s conventional and unconventional natural gas resources potential and exploration targets
Natural Gas Geoscience, 2018Co-Authors: Min Zheng, Shejiao Wang, Qiulin Guo, Man Zheng, Ningsheng ChenAbstract:Abstract A series of significant breakthroughs in exploring conventional and unconventional natural gas resources have been achieved in new strata and new domains. However, the quality of the increased reserves has declined with the entry of unconventional resources into the reserves sequence. Therefore, the potential of conventional and unconventional natural gas resources as well as important exploration regions of the remaining natural gas resources need to be clarified, and favorable directions need to be established. On the basis of oil and gas exploration results, discoveries in petroleum geology, and exploration data of the past 10 years acquired by PetroChina, an entire system of resource assessment for conventional and unconventional oil and gas resources has been established. The fourth round of resource assessment has been systematically executed. The results indicate that the total conventional natural gas resources of China are 78 × 1012 m3, which shows an increase of 8 × 1012 m3 over the results of the third round of resource assessment. Unconventional resources include four types of resources: tight gas, shale gas, coalbed methane, and natural gas hydrates. Among them, tight gas reservoirs make up 21.86 × 1012 m3 (Jiyang, Dongpu, Nanxiang, Subei, and others were excluded from the assessed regions). In addition, shale gas, coalbed methane, and natural gas hydrate reservoirs make up 80.21 × 1012 m3, 29.82 × 1012 m3, and 153.06 × 1012 m3, respectively. The remaining resources for onshore conventional natural gas are distributed mainly in four significant domains, which are lithology–strata (Clastic Rock), marine carbonatites, foreland thrust belts, and complex tectonic belts. Of these, marine carbonatites and foreland thrust belts are the dominant domains. The resources for offshore natural gas are concentrated mainly in three domains, which are offshore structures, organic reefs, and lithology in deep water. The total remaining natural gas resources in marine carbonatites, foreland, lithology–strata, complex tectonic belts, and the South China Sea amount to 59.83 × 1012 m3, which is 94% of the remaining natural gas resources in China. Based on this assessment, favorable targets are selected including 10 targets for conventional resources, 4 for tight gas, 4 for coalbed methane, and 6 for shale gas.
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China's conventional and unconventional natural gas resources: Potential and exploration targets
Elsevier, 2018Co-Authors: Min Zheng, Shejiao Wang, Qiulin Guo, Man Zheng, Ningsheng ChenAbstract:A series of significant breakthroughs in exploring conventional and unconventional natural gas resources have been achieved in new strata and new domains. However, the quality of the increased reserves has declined with the entry of unconventional resources into the reserves sequence. Therefore, the potential of conventional and unconventional natural gas resources as well as important exploration regions of the remaining natural gas resources need to be clarified, and favorable directions need to be established. On the basis of oil and gas exploration results, discoveries in petroleum geology, and exploration data of the past 10 years acquired by PetroChina, an entire system of resource assessment for conventional and unconventional oil and gas resources has been established. The fourth round of resource assessment has been systematically executed. The results indicate that the total conventional natural gas resources of China are 78 × 1012 m3, which shows an increase of 8 × 1012 m3 over the results of the third round of resource assessment. Unconventional resources include four types of resources: tight gas, shale gas, coalbed methane, and natural gas hydrates. Among them, tight gas reservoirs make up 21.86 × 1012 m3 (Jiyang, Dongpu, Nanxiang, Subei, and others were excluded from the assessed regions). In addition, shale gas, coalbed methane, and natural gas hydrate reservoirs make up 80.21 × 1012 m3, 29.82 × 1012 m3, and 153.06 × 1012 m3, respectively. The remaining resources for onshore conventional natural gas are distributed mainly in four significant domains, which are lithology–strata (Clastic Rock), marine carbonatites, foreland thrust belts, and complex tectonic belts. Of these, marine carbonatites and foreland thrust belts are the dominant domains. The resources for offshore natural gas are concentrated mainly in three domains, which are offshore structures, organic reefs, and lithology in deep water. The total remaining natural gas resources in marine carbonatites, foreland, lithology–strata, complex tectonic belts, and the South China Sea amount to 59.83 × 1012 m3, which is 94% of the remaining natural gas resources in China. Based on this assessment, favorable targets are selected including 10 targets for conventional resources, 4 for tight gas, 4 for coalbed methane, and 6 for shale gas. Keywords: Resources assessment, Resources potential of natural gas, Remaining resources potential of natural gas, Resources distribution, Major exploration region, Favorable target zon
Piacentini Tommaso - One of the best experts on this subject based on the ideXlab platform.
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Geomorphology of soft Clastic Rock coasts in the mid-western Adriatic Sea (Abruzzo, Italy)
'Elsevier BV', 2019Co-Authors: Miccadei Enrico, Mascioli F, Ricci F, Piacentini TommasoAbstract:We present the first detailed overall study on the Rock coasts in the central Adriatic Sea (Abruzzo, Italy), which is one of the few cases of a coast with Clastic soft Rocks in the entire Mediterranean area. The coast is composed of cliffs with small beaches, coastal slopes with or without a contiguous coastal plain and intervening low-lying coasts. It is developed on the eastern seaward side of a wide plateau and mesa landscape shaped on an Early- Middle Pleistocene clay-sand-sandstone-conglomeratemarine sequence covered by Late Pleistocene – Holocene continental deposits. The study focuses on the overall coast and on eight specific sites, combining: (i) DEM (2 m cell, LiDAR-derived) analysis and geological-geomorphological surveys of theemerged and submerged areas, for the cliff/coastal slope characterization, (ii) the results of U/Th, 14C sediment dating and archaeological and palaeontological attributions, for constraining the coastal evolution, and (iii) aerial photo time-series (1954–2013 time span) analysis, for the recent cliff retreat assessment. The overall features of the cliffs and coastal slopes were defined in terms of theirmorphology, lithology, tectonic setting, landforms and geomorphological processes,whereas the analysis of Late Pleistocene – Holocene continental deposits and landform distribution defined and constrained the evolution of the coastal system. This enabled us to define eight different types of coastal cliffs/slopesmeaningful for Clastic soft Rock coasts. The coastal types were defined in terms of: (i) lithology (15% cliffs on marine sandstone, 15% cliffs on marine conglomerate, 3% cliffs on continental deposits, 43% coastal slopes on clay-sand-sandstoneconglomerate sequences), (ii) morphostructural setting (i.e. clay/sandstone-conglomerate interface elevation), and (iii) of state of activity (3.8% active cliffs, 13.8% inactive cliffs, 15.9% palaeocliffs, 43% of inactive and locally reactivated landslides on coastal slopes). Variable retreat rates were also defined, from retreat measurements over a 60-year time span (ranging from 0.15 m/yr to ~1 m/yr), andwere found to be induced by episodic and localized cliff recession processes and connected to combined wave-cut and gravity-induced slope processes. The assessment of coastal and gravity-induced geomorphological processes, combinedwith the analysis and dating of the continental deposits, allowed us to define the Late Pleistocene to present evolution and timing and the evolutionary mechanisms of the main coastal types of soft Rock coasts. They are connected to wave-cut and gravity-induced erosion cycles on cliffs and to large rotational ancient landsliding with local recent reactivations on coastal slopes. For the different coastal types the expected hazard conditions were outlined.Published72-942T. Deformazione crostale attivaJCR Journa
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Recent Geomorphological Evolution and 3D Numerical Modelling of Soft Clastic Rock Cliffs in the Mid-Western Adriatic Sea (Abruzzo, Italy)
'MDPI AG', 2019Co-Authors: Calista Monia, Miccadei Enrico, Mascioli Francesco, Menna Valeria, Piacentini TommasoAbstract:Geomorphological evolution, erosion and retreat processes that a ect the Rocky coasts of the mid-western Adriatic Sea (Abruzzo, Central Italy) are the subject of this research. This coastal sector, one of the few examples of Clastic soft Rock coasts in the Mediterranean Sea, is characterized by active, inactive and paleo cli s, as well as coastal slopes, composed of the clayey-sandy-arenaceous-conglomeratic marine sequence (Early-Middle Pleistocene) covered by continental deposits (Late Pleistocene-Holocene). This study provides geomorphological and 3D modelling stability analyses of the cli s of Torre Mucchia, Punta Lunga, Punta Ferruccio (Ortona, CH) and Punta Aderci (Vasto, CH), which are popular tourist sites included in natural reserve areas. They are representative of two main types of active cli s on soft Clastic Rocks: cli s on sandstone and cli s on conglomerate with notches. In order to evaluate the processes and factors that induce cli s to retreat and their recent evolution, the research was based on a DEM analysis (LIDAR 2 2 m data), aerial photos and an orthoimages interpretation, detailed geological–geomorphological surveys, and a structural analysis; field and remote investigations were combined with numerical modelling with a FLAC3D calculation code. Geological and geomorphological field data provided reliable 3D models, and FLAC3D numerical analyses allowed the definition of the most critical and/or failure areas, and the evaluation of the controlling factors, evolution mechanisms of the slopes and the sliding kinematics of gravitational instability phenomena. Di erent retreat mechanisms have been observed all along the investigated coastal sectors, induced by gravitational processes due to coastal erosion cycles at the foot of the cli s, and controlled by lithological features and joints systems. The geomorphological analysis combined with the 3D modelling (i) showed that the retreat process of the cli s is connected to translational slides and Rockfalls (cli s on sandstone), combined Rockfalls, and topples (cli s on conglomerate), largely controlled by main joints; (ii) defined the most critical areas along the cli s. These results are of great interest in the assessment of hazard connected to potential sliding on the cli s. Their implementation within Geographical Information Systems provides a valuable contribution to the integrated management of coastal areas, strongly improving the identification and prediction of landscape changes and supporting a new geomorphological hazards assessment, in areas of high tourism, as well as natural and cultural landscape value.Publishedid 3092T. Deformazione crostale attivaJCR Journa
Yanjing Chen - One of the best experts on this subject based on the ideXlab platform.
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age sediment source and tectonic setting of the ore hosting jinwozi formation at the jinwozi gold deposit in beishan orogen nw china evidence from detrital zircon u pb ages and lu hf isotopes
Ore Geology Reviews, 2020Co-Authors: Xi Chen, Kuidong Zhao, Kefa Zhou, Yanjing ChenAbstract:Abstract The Jinwozi deposit is the most economically important gold (Au) deposit in the Beishan Orogen (Eastern Xinjiang, NW China). The Au orebodies occur as quartz veins or altered lodes in the Jinwozi Formation Clastic Rocks and the Jinwozi granite. The age, detrital source and tectonic setting of the Jinwozi Formation, however, have not been well understood. In this paper, we reported new LA–ICP MS detrital zircon U–Pb ages and Lu–Hf isotopes of ore-hosted Clastic Rock of the Jinwozi Formation. Detrital zircons from three samples yield 334 U–Pb ages varied from 330 to 2598 Ma, showing complex detrital sources. The youngest detrital zircon population suggests that the Jinwozi Formation deposited no earlier than 330 Ma in the Late Carboniferous or Permian. The majority of the detrital zircons (291 out of 334) have ages between 330 and 533 Ma, suggesting a dominant Paleozoic detrital source. Much of these age data (282 out of 334) range from 470 to 370 Ma, broadly coeval with the zircon U–Pb ages of the Jinwozi granite. Zircon Hf isotope data also implicate their similar origin to the Jinwozi granite. The source Rocks, as well as the Jinwozi granite, may have formed in the Early Paleozoic Caledonian Orogeny, during which the supercontinents of Gondwana and Laurasia assembled. This orogeny process may have provided plenty of detritus for the Clastic Rocks of the Jinwozi Formation. Precambrian detrital zircon ages from the Jinwozi Formation cluster around 2400–2600 Ma, 1800–2100 Ma, 800–1300 Ma, which corresponds to the supercontinent assembly events of Kenor, Columbia and Rodinia, respectively. The age populations of 2200–2300 Ma and 600–660 Ma are possibly related to the breakup of Kenor and Rodinia supercontinents. This understangding is supported by zircon Hf isotope data.
Min Zheng - One of the best experts on this subject based on the ideXlab platform.
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china s conventional and unconventional natural gas resources potential and exploration targets
Natural Gas Geoscience, 2018Co-Authors: Min Zheng, Shejiao Wang, Qiulin Guo, Man Zheng, Ningsheng ChenAbstract:Abstract A series of significant breakthroughs in exploring conventional and unconventional natural gas resources have been achieved in new strata and new domains. However, the quality of the increased reserves has declined with the entry of unconventional resources into the reserves sequence. Therefore, the potential of conventional and unconventional natural gas resources as well as important exploration regions of the remaining natural gas resources need to be clarified, and favorable directions need to be established. On the basis of oil and gas exploration results, discoveries in petroleum geology, and exploration data of the past 10 years acquired by PetroChina, an entire system of resource assessment for conventional and unconventional oil and gas resources has been established. The fourth round of resource assessment has been systematically executed. The results indicate that the total conventional natural gas resources of China are 78 × 1012 m3, which shows an increase of 8 × 1012 m3 over the results of the third round of resource assessment. Unconventional resources include four types of resources: tight gas, shale gas, coalbed methane, and natural gas hydrates. Among them, tight gas reservoirs make up 21.86 × 1012 m3 (Jiyang, Dongpu, Nanxiang, Subei, and others were excluded from the assessed regions). In addition, shale gas, coalbed methane, and natural gas hydrate reservoirs make up 80.21 × 1012 m3, 29.82 × 1012 m3, and 153.06 × 1012 m3, respectively. The remaining resources for onshore conventional natural gas are distributed mainly in four significant domains, which are lithology–strata (Clastic Rock), marine carbonatites, foreland thrust belts, and complex tectonic belts. Of these, marine carbonatites and foreland thrust belts are the dominant domains. The resources for offshore natural gas are concentrated mainly in three domains, which are offshore structures, organic reefs, and lithology in deep water. The total remaining natural gas resources in marine carbonatites, foreland, lithology–strata, complex tectonic belts, and the South China Sea amount to 59.83 × 1012 m3, which is 94% of the remaining natural gas resources in China. Based on this assessment, favorable targets are selected including 10 targets for conventional resources, 4 for tight gas, 4 for coalbed methane, and 6 for shale gas.
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China's conventional and unconventional natural gas resources: Potential and exploration targets
Elsevier, 2018Co-Authors: Min Zheng, Shejiao Wang, Qiulin Guo, Man Zheng, Ningsheng ChenAbstract:A series of significant breakthroughs in exploring conventional and unconventional natural gas resources have been achieved in new strata and new domains. However, the quality of the increased reserves has declined with the entry of unconventional resources into the reserves sequence. Therefore, the potential of conventional and unconventional natural gas resources as well as important exploration regions of the remaining natural gas resources need to be clarified, and favorable directions need to be established. On the basis of oil and gas exploration results, discoveries in petroleum geology, and exploration data of the past 10 years acquired by PetroChina, an entire system of resource assessment for conventional and unconventional oil and gas resources has been established. The fourth round of resource assessment has been systematically executed. The results indicate that the total conventional natural gas resources of China are 78 × 1012 m3, which shows an increase of 8 × 1012 m3 over the results of the third round of resource assessment. Unconventional resources include four types of resources: tight gas, shale gas, coalbed methane, and natural gas hydrates. Among them, tight gas reservoirs make up 21.86 × 1012 m3 (Jiyang, Dongpu, Nanxiang, Subei, and others were excluded from the assessed regions). In addition, shale gas, coalbed methane, and natural gas hydrate reservoirs make up 80.21 × 1012 m3, 29.82 × 1012 m3, and 153.06 × 1012 m3, respectively. The remaining resources for onshore conventional natural gas are distributed mainly in four significant domains, which are lithology–strata (Clastic Rock), marine carbonatites, foreland thrust belts, and complex tectonic belts. Of these, marine carbonatites and foreland thrust belts are the dominant domains. The resources for offshore natural gas are concentrated mainly in three domains, which are offshore structures, organic reefs, and lithology in deep water. The total remaining natural gas resources in marine carbonatites, foreland, lithology–strata, complex tectonic belts, and the South China Sea amount to 59.83 × 1012 m3, which is 94% of the remaining natural gas resources in China. Based on this assessment, favorable targets are selected including 10 targets for conventional resources, 4 for tight gas, 4 for coalbed methane, and 6 for shale gas. Keywords: Resources assessment, Resources potential of natural gas, Remaining resources potential of natural gas, Resources distribution, Major exploration region, Favorable target zon
Shuai Yin - One of the best experts on this subject based on the ideXlab platform.
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logging assessment of tight Clastic Rock reservoir fractures via the extraction of effective pore aspect ratios a case study of lower permian strata in the southern qinshui basin of eastern china
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Shuai Yin, Wenlong Ding, Wen Zhou, Yuming Shan, Ruyue Wang, Jianjun LiuAbstract:Abstract Research on tight gas enrichment in coal measure strata is contentious worldwide. Gas logging anomalies are very common in the upper Paleozoic coal-bearing strata in the Southern Qinshui Basin of eastern China. The distribution characteristics of these free gases are closely related to the degree of fracture development. The Rock pore aspect ratio (α) can reflect the morphology of Rock pores and fractures. In this paper, we use full wave logging data to propose a new logging assessment method for tight Clastic Rock reservoir fractures via the extraction of effective pore aspect ratios. The basic concept is as follows: (1) we extract the Rock matrix mineral modulus and dry Rock modulus of the Rocks using an optimized algorithm, and (2) we invert the effective pore aspect ratio of coal measure strata using the theoretical model of a differential equivalent medium. The research results show that the studied Clastic Rocks in coal measure strata are very tight, with porosity levels that are generally less than 5%, and sections in which fractures have formed often correspond to relatively low α values of less than 0.1. The microfracture-bearing sections identified based on α inversions correspond well to the sections with fractures at the core scale. Thus, this method can be used to identify fractured sections at the core scale. For sandy mudstone, microfractures mainly exist in sandy intervals, and α is negatively related to Rock porosity and positively related to shale content. Regardless of lithology, i.e., sandstone, mudstone or coal, the communication and transport capacity of fracture systems are greater than those of the pore system, and coal-derived gas reservoirs form when there are good gas sources, transportation systems, fracture systems and preservation conditions. Similar to the formation mechanism of fractures in Rocks, α is also derived from mechanical mechanisms, and this study shows that the inversion process is effective in characterizing the degree of fracture development in tight Clastic Rocks in coal measure strata based on elastic Rock properties.