JOPC
Advanced Search
Subscription
Email Alert
Home
|
About JOPC
|
Editorial Board
|
Before Submission
|
Subscription
|
Download
|
Publication Ethics
|
Editorial Office
|
Chinese
News
Search in CSB
Adv Search
·
Mourn deeply for the former Chief-editor Professor FENG Zengzhao
·
To readers and anthors
more>>
Office online
·
Online Submission
·
Peer Review
·
Scientific Editor
·
Editor Work
·
Editor-in-chief
Journal online
·
Forthcoming Articles
·
Current Issue
·
Next Issue
·
Browse by Year
·
Browse by Section
·
Archive By Volumn
·
Advanced Search
·
Email Alert
·
Links
·
《Petroleum Science》
·
Periodical Press of CUP
·
China University of Petroleum (Beijing)
·
《Journal of China University of Petroleum(Edition of Natural Science)》
·
《ACTA PETROLOGICA SINICA》
·
《Geology in China》
·
《China Geology》
·
《ACTA GEOCHIMICA》
·
《geochimica》
·
《GEOTECTONICA ET METALLOGENIA》
·
China Geoscience Journal Portal
·
《Bulletin of Mineralogy, Petrology and Geochemistry》
JOPC 2011 Vol.13 Number 5
2011, Vol.13 Num.5
Online: 2011-10-01
News
PALAEOGEOGRAPHY AND MINERAL RESOURCES
LITHOFACIES PALAEOGEOGRAPHY AND SEDIMENTOLOGY
GEOCHEMISTRY AND SEDIMENTARY ENVIRONMENT
News
0
2011 Vol. 13 (5): 0-0 [
Abstract
] (
1326
) [
HTML
0KB] [
PDF
492KB] (
527
)
PALAEOGEOGRAPHY AND MINERAL RESOURCES
473
Shao Longyi, Wang Hao, Large D J
Net primary productivity and its control of the Late Permian peatlands in southwestern China
Milankovitch theory is an important tool in constraining time in the palaeoenviorment analysis. In this study，the geophysical logs of the Late Permian No.17 Coal in Nuodong，Puan of Guizhou Province and No.10 Coal in Tianyou，Fuyuan of Yunnan Province are analyzed employing spectral analysis.The result shows that the mineral matter content(ash yield)of the coal was possibly influenced by 123ka(eccentricity)，35.6 ka(obliquity)and 21.2 ka(precession)Milankovitch cycles.Using this timeframe，the Lopingian tropical peatland carbon accumulation rate is calculated to be 54.3～77.0 gC/（m
2
·a），which is expected to correspond to a NPP of 543～1540 gC/（m
2
·a）. A comparison of NPP and temporal atmospheric composition among the Late Permian，Late Carboniferous and modern time indicates that the Late Permian NPP calculated is consistent with geochemical and palaeobotanical models，supporting a proposal that terrestrial productivity is mainly controlled by temporal atmospheric O
2
and CO
2
levels.
2011 Vol. 13 (5): 473-480 [
Abstract
] (
2047
) [
HTML
0KB] [
PDF
884KB] (
586
)
481
Cai Hou'an, Li Baofang, Shao Longyi, Xu Debin, Shao, Kai, Zhou Yuanyuan
Sedimentary environments and coal accumulation patterns of the Lower Cretaceous Shahai Formation in Fuxin Basin，Liaoning Province
The research on sedimentary environment and coal accumulation pattern of the Lower Cretaceous Shahai Formation in Fuxin Basin is relatively insufficient.Based on field observation and combines the observation and description of borehole cores and outcrop sections，across well profile analysis and well logging curves, the authors analyzed the sedimentary environments and coal accumulation pattern of the Shahai Formation in Fuxin Basin.The result shows that alluvial fan-fan delta sedimentary systems and lacustrine sedimentary system were developed in the Shahai Formation of the Fuxin Basin.The Shahai Formation can be divided into 3 third-order sequences and each sequence can be further subdivided into transgressive systems tract and highstand systems tract.Among them，the Members 1 and 2 of the Shahai Formation belong to Sq1，the Member 3 of Shahai Formation belongs to Sq2 and the Member 4 of the Shahai Formation belongs to Sq3.Coal seams of the Shahai Formation are mainly distributed in Sq2.Coal accumulation centers of transgressive systems tract of Sq2 are distributed in the Qinghemen-Yimatu County，South Dongliang County and Jiudaoling County，while those of highstand systems tract in Sq2 are located in the Qinghemen County and Jiudaoling County.Depositional models of coal formation in the Shahai Formation include inter-fan paludification coal formation in the transgressive systems tract and deltafront coal formation in highstand systems tract，among which the former is better than the latter.
2011 Vol. 13 (5): 481-491 [
Abstract
] (
2307
) [
HTML
0KB] [
PDF
2728KB] (
570
)
493
Guo Lijun, Hong Yuanjin, Shao Longyi, Yi Tongsheng, Zhang Weiping, Wang Hao
Sequence stratigraphy and coal accumulation of the Upper Permian in Zhijin-Nayong Coalfield of western Guizhou Province
The Zhijin-Nayong Coalfield in western Guizhou Province is well developed with marine-continental transitional facies and limestone markers，and thus became an ideal area for studying the Late Permian sedimentary facies and sequence stratigraphy in southwestern China.This paper has analyzed the high resolution sequence stratigraphy of the Late Permian coal seams(the Longtan and Changxing Formations).The coal-accumulating characteristics in the sequence stratigraphic framework have been discussed.Sequence boundaries represented by regional unconformity，incised valley filling sandstone base，and the palaeosol horizons have been identified.Combined with the transgression-regression cycles inferred by the distribution patterns of the limestone markers，the coal seams are subdivided into 3 third-order sequences.The total coal seams are is thicker in sequence Ⅲ and thinner in sequence Ⅱ，with the thinnest in sequence Ⅰ.Within the sequence，the thickest coals were developed in the transgressive systems tract and the thinnest coals were preserved in the lowstand systems tract.Based on reconstruction of the Late Permian sequence stratigraphic framework，we propose that the thick coal seams were developed in the delta plain environments of the transgressive systems tract.
2011 Vol. 13 (5): 493-500 [
Abstract
] (
2365
) [
HTML
0KB] [
PDF
653KB] (
698
)
501
Zheng Qiming, Liu Qinfu, Shen Qi, Wu Zeguang, Zhang Pengfei
Mineralogy and origin of ammonium-illite of the Carboniferous Taiyuan Formation in Jincheng and Yangquan districts of Shanxi Province
Ammonium-illite is the isomorphism of the illite，in which the K
+
was substituted by the NH
+
4
. The X-ray diffraction，fourier infrared spectrum and TGA-DSC combined with fourier infrared spectrum were used to study the minerals in No.15 coal seam from Jincheng and Yangquan districts of Shanxi Province.It was found that the main clay minerals in the coal partings and the coal ashes under low temperature were ammonium-illite and kaolinite，with 21％～74％ ammnioum-illite. The X-ray diffraction peak of
d
(001)
=1.026～1.032 nm and the absorption peak of 1428.37～1431.99 cm
-1
in infrared spectrum，are two important characteristics to distinguish the ammonium-illite from other clay minerals.The results of TGA-DSC combined with fourier infrared spectrum indicated that the deammonification temperature was between 450 ℃ and 700 ℃，and the crystal destruction and ammonium-releasing reach maximum at the temperature of 559 ℃.It was found that the ammonium had kaolinite illusion，indicating that the ammonium-illite was transformed from kaolinite under the NH
+
4
-rich and K
+
-poor environment in diagenesis.
2011 Vol. 13 (5): 501-508 [
Abstract
] (
2272
) [
HTML
0KB] [
PDF
2350KB] (
548
)
509
Cheng Zhongping, Meng Yuanlin, Wang Yuechuan, Wang Jian, Wei Wei, Niu Jiayu, Sun Hongbin, Gao Jianjun, Xiao Lihua
Predrilling reservoir quality prediction of Well Jin 310 in Liaohe Depression of Bohai Bay Basin
In order to predict the reservoir quality of Well Jin 310 in Jin 1 well block of Liaohe Depression of Bohai Bay Basin before drilling，the diagenetic stages of the Member 2 of Paleogene Shahejie Formation were predicted by diagenetic modeling，and the reservoir porosity of the Member 2 of Shahejie Formation was predicted after the porosity prediction model was established considering the integrated effects of sedimentary facies and diagenesis on the porosity of reservoirs.As the results show，secondary pore was well developed in the reservoir located in the middle diagenetic stage A of the Member 2 of Shahejie Formation，and the absolute error between predicted porosity and measured porosity is only 1.33％ in the reservoir with the content of filling materials of 16.13％. Therefore，the method of predrilling reservoir quality prediction considering integrated effects of sedimentary facies and diagenesis on reservoir quality could be applied to the exploration deployment of pre-exploration wells.
2011 Vol. 13 (5): 509-516 [
Abstract
] (
2386
) [
HTML
0KB] [
PDF
939KB] (
649
)
LITHOFACIES PALAEOGEOGRAPHY AND SEDIMENTOLOGY
517
Zhou Yong, Ji Youliang, Wan Lu, Pan Chunfu
Characteristics and geologic significance of seismites in the Lower Cretaceous Laiyang Formation in northeastern Jiaolai Basin in Shandong Province
The Jiaolai Basin is a Mesozoic residual basin.The southern and northeastern parts of the basin were intensively affected by Tanlu and Mou-Ji Faults in the Cretaceous，and several types of deformational structures that are interpreted as seismites were formed.Based on core and outcrop observation，two types of sedimentary structures formed by seismic events were observed，including deformation structures of soft-sediments(liquefied deformation structure，stretch deformation structure，stress deformation structure)and hard rock.These sedimentary structures can be subdivided into 9 subclasses，and their genetic mechanisms were analyzed.The Mou-Ji Fault is a main fault which controlled the formation of the Jiaolai Basin，and stretched with NW-SE direction in Laiyang Formation depositional period，which caused frequent earthquake in the northeastern Jiaolai Basin.As a result，seismites were formed and were dominated by liquefied deformation of soft-sediments，which demonstrated the earthquake intensity was 5<
Ms
<8.A large number of micro-fractures in rocks were formed due to the earthquake，and the pores were connected by micro-fractures，which finally increased the permeability of rocks.The trigger mechanism of turbidite of the Shuinan Member can be explained as earthquake according to the discovery of seismites.Seismo-turbidites can be preserved as diagenetic traps because of dissolution caused by organic acids，which provides a new perspective and field for oil and gas exploration.
2011 Vol. 13 (5): 517-528 [
Abstract
] (
2406
) [
HTML
0KB] [
PDF
5518KB] (
639
)
529
Liu Wei, Zhang Guangya, Pan Wenqing, Deng Shenghui, Li Honghui
Lithofacies palaeogeography and sedimentary evolution of the Cambrian in Tarim area
Based on the outcrops，drilling wells and seismic data，the lithofacies palaeogeography maps of the Cambrian in Tarim area were compiled with 5 steps of ①stratigraphic framework establishment，② sedimentation geology analyses，③interpretation of sedimentary characters of seismic data，④analyses of stratigraphic thickness maps and ⑤comprehensive analyses.These new maps show the distribution of the palaeogeographic units in each stage of the Cambrian: Taxi Platform，a large-scale platform，located in the central and western parts of the Tarim area，while Luoxi Platform，more smaller than the former one，located in the eastern part of the Tarim area.Between the 2 platforms，there was a starved basin which was named Tadong Basin.In the Cambrian，these palaeogeographic units had developed inheritively under the sustained stretching tectonic setting.The deposition rate，palaeoclimate and relative changes of sea level controlled the differentiation of sedimentary environments in carbonate platform，and also caused the formation of widespread gypsum and salt rock in the Middle Cambrian.
2011 Vol. 13 (5): 529-538 [
Abstract
] (
2379
) [
HTML
0KB] [
PDF
2055KB] (
886
)
539
Xie Shangke, Wang Zhengjiang, Wang Jian
Lithofacies palaeogeography of the Late Ordovician in northeastern Guizhou Province
The Upper Ordovician is made up of the Baota，Linxiang，Wufeng and Guanyinqiao Formations in northeastern Guizhou Province.The Upper Ordovician in northeastern Guizhou can be divided into barrier carbonateplatform，non-barrier carbonate ramp and shallow marine shelf according to the sediment and sedimentary facies changes.Plate tectonics became intensive in the Late Ordovician，most areas uplifted due to the squeeze and compression of the Cathaysia Plate.Carbonate ramp was developed in the Baota Age and the carbonate platform was gradually drowned. The lithofacies paleogeographic framework changed from the paleouplift-tidal flat to carbonate ramp.The carbonate platform terminated since the Linxiang Age，and the plate movement made the uplifting area expanded;The Qianzhong-Wuling paleouplift and Chuanzhong paleouplift was more expanded during the Wufeng Age，and most sea area decreased significantly.The Yangtze marine area became a semi-limited-limited shallow sea surrounded by paleouplifts，and black shale occupied most region of the study area. Black shale series of the Wufeng and Longmaxi Formations is an important oil-producing rock of the Upper and Middle Yangtze Area.
2011 Vol. 13 (5): 539-549 [
Abstract
] (
2102
) [
HTML
0KB] [
PDF
1140KB] (
811
)
551
Wei Hengye, Chen Daizhao
Lithofacies palaeogeography of the Qixia Age of Permian in western Hubei-northwestern Hunan Provinces
Detailed stratigraphic and depositional facies analyses for the Qixia to the Lower Maokou Formations from several sections in western Hubei-northwestern Hunan Provinces indicate an intra-craton carbonate ramp environment，including inner，middle and outer ramps，and basinal facies.The inner ramp facies consists of thick-bedded to massive bioclastic limestone，characterized by bioclastic grains of green algae and benthic foraminifera and lack of high-energy bioclastic shoals.The middle ramp facies consists of medium- to thick-bedded limestone bearing bioclasts and thick-bedded lime mudstone.This facies is characterized by skeletal grains of crinoids，bryozoans and small foraminiferas，but is lack of the hummocky cross-stratification.The outer ramp facies consists of marlstone interbedded with thin-bedded lime mudstone bearing bioclastic grains of thin-shelled brachiopods.Basinal facies is characterized by dark-grey marlstone intercalated with black calcareous shales.These features suggest a low energy protected carbonate ramp(or shelf)environment.Three third-order sequences(S1，S2 and S3)were identified in the Qixia and Lower Maokou Formations，each spanning about 2 Ma.These sequences are dominantly composed of the lower transgressive and upper highstand systems tracts.The basal sequence S1 was deposited during the initial transgression of Qixia Age，during which the carbonate ramp was established，developing intrashelf basin in the western Hubei area.Then an overall mild shallow carbonate ramp(or shelf)environment predominated over as the intrashelf basin was filled up during S2 deposition.Sequence S3 was deposited during the largest-scale transgression in the Late Paleozoic，resulting in an apparent deepening in water depth.The deep outer ramp was then established once again and expanded in a mushroom-shaped area in Sangzhi-Changyang-Jingzhou-Changde area.
2011 Vol. 13 (5): 551-562 [
Abstract
] (
2270
) [
HTML
0KB] [
PDF
5289KB] (
741
)
GEOCHEMISTRY AND SEDIMENTARY ENVIRONMENT
563
Tang Dongjie, Shi Xiaoying, Pei Yunpeng, Jiang Ganqing, Zhao Guisheng
Redox status of the Mesoproterozoic epeiric sea in North China
Marine authigenic aragonite crystal fans and isopachous cements are mainly formed in anoxic-dysoxic seawater or pore waters with oversaturated CaCO
3
derived from bacterial sulfate reduction(BSR).Their presence can be used as a potential indicator for redox conditions of the depositional environment.Carbonate units from the Mesoproterozoic Wumishan Formation(ca.1.5～1.45 Ga)in North China Platform show that aragonite fans and cements are common in deep subtidal deposits，but decline in shallow subtidal and disappear in intertidal deposits.Particularly the biolaminites deposited from deep-subtidal environments are composed of submillimeter-scale dark-light couplets of microbial mat and isopachous aragonite.Microscopically，the isopachous aragonites are composed of fibrous crystals or fan-shaped aggregates，similar to those recognized from the Archean strata of South Africa.Carbonates commonly form shallowing-upward cycles with shallow subtidal facies(Unit A) at the base，intertidal facies(Unit B) in the middle and supratidal facies(Unit C) at the top.The shallow subtidal facies(Unit A)contain abundant thrombolites，in which meso-clots consist typically of fabrous or fan-shaped aragonite aggregates surrounding organic-rich nuclei or pyrite grains，but rarely with carbonates micritic grains.Intertidal facies(Unit B)are dominated by laminated dolostone with interbeds of grainstones or packstones.Aragonite fans and cements are present but not abundant.Most of the aragonites in this unit grow on mat fragments or previously formed minerals，either as isopachous，fan-shaped or as botryoidal aggregates that fill cavities.Supratidal facies(Unit C)consists of micritic dolostone with pseudomorphs of halite and desiccated microbial mats but no aragonite crystal fans or cements. Geochemical analysis shows that V/Th，Mo/Th and U/Th increase from Unit C to Unit A，suggesting progressive anoxic condition with increasing water depth.Our study shows that during deposition of the Wumishan Formation(ca.1.5～1.45 Ga)，the North China epeiric sea was likely anoxic below the fair-weather wave base，but the abundance of aragonite crystal fans and fibrous cements in deep-subtidal environments imply the availability of sulfate in shelf environments of the Mesoproterozoic epeiric sea.
2011 Vol. 13 (5): 563-580 [
Abstract
] (
2233
) [
HTML
0KB] [
PDF
9358KB] (
580
)
