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Petroleum System of the Fula Depression at the Muglad Basin in the Central African Fault Zone

Journal of Earth Science 2011年第3期22卷 363-370页

作者：张亚敏顾勤 School of Earth Sciences and Resources Management Chang'an University Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of Education Exploration and Development Scientific Research Institute Zhongyuan Oilfield CompanySINOPEC

Petroleum system theory has been used to study characteristics of the Fula depression in the Central African fault *** this system,deep lacustrine facies mudstone in the Abu Gabra For-mation of the Lower Cretaceous is a very good source rock,thick deltaic facies sandstone of the Abu Gabra Formation and fluvial facies sandstone of the Bentiu Formation are good reservoir beds,and the mudstone in the Upper Cretaceous Darfur Group is the regional cap *** oil search mode and fault block trap seal-off conditions are considered here for passive rift *** with respect to oil source rock distribution,successive development of reverse fault block and faulted anticlinal traps on low relief structures could have accumulated hydrocarbons because of lateral sealing by down-thrown mudstone along the up-dipping reservoir *** present,discoveries in this system are all large-duty oil *** 2009,proved reserves exceeded 2×108 t,and about 3×106 t annual throughput of crude oil was *** exploration of the Fula depression is of short cycle and high benefit,which will be of great help for exploration in the Muglad basin.

关键词： half-horst hydrocarbon source rock petroleum system Fula depression Muglad basin.

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Biogeochemical Records at Shangsi Section,Northeast Sichuan in China:The Permian Paleoproductivity Proxies

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Journal of China University of Geosciences 2008年第5期19卷 461-470页

作者：马仲武胡超涌颜佳新解习农 Key Laboratory of Biogeology and Environmental Geology of Ministry of Education China University of GeosciencesWuhan 430074 China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074 China

The marine primary producers assimilate the atmospheric CO2 to form the organic carbon in surface water. The organic carbon then settles down through the water column and is removed from the oceans by final preservation in sediments in the form of petroleum or nature gases. The reconstruction of paleoproductivity will thus improve our understanding of the biological processes in the formation of fossil energy resource and help to locate new sites for future exploration. In this study, biorelated elements P, Cd, Al, Ba, as well as redox sensitive element Mo, were analyzed in the 448 rock samples collected from Permian strata at the Shangsi （上寺） Section, Guangyuan （广元）, Northeast Sichuan （四川） in China. On the basis of the Ti content, the nondetrital contents of P, Ca, and Al, denoted as Pxs, Cdxs, and Alxs, were calculated and found to coincide with the TOC content throughout the whole section, with some enrichment intervals being found in the middle part of Chihsia Formation, topmost Maokou （茅口） Formation, and Dalong （大隆） Formation. This suggests that the biorelated elements could he used as proxies for the paleoproductivity here in this section. Baxs, a paleoproductivity indicator widely used in the paleoceanography, shows insignificant correlation with TOC, Pxs, Cdxs, and Alxs, probably arising from the loss of biological barium in anoxic conditions. Compiled with the data of TOC content and Pxs, Cdxs, and Alxs, three episodes of enhanced paleoproductivity were identified in Permian strata including the middle part of Chihsia Formation, topmost Maokou Formation, and Dalong Formation.

关键词： Permian paleoproductivity trace element hydrocarbon source rock

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Kinetic Parameters of Methane Generated from source rocks in the Kuqa Depression of Tarim Basin and Their Application

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Acta Geologica Sinica(English Edition) 2008年第1期82卷 154-163页

作者： LI Xianqing XIAO Xianming MI Jingkui TANG Yongchun XIAO Zhongyao LIU Dehan SHEN Jiagui YANG Yunfeng WANG Yan DONG Peng State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China Research Center of Petroleum Energy and Environment California Institute of Technology 21910 Currier Rd Walnut CA 61769 USA Research Institute of Exploration and Development Tarim Oil Field Company PetroChina Korla Xinjiang 841000 China

In a thermal simulation experiment of gold tubes of closed-system, calculating with the KINETICS and GOR-ISOTOPE KINETICS software, kinetic parameters of gas generation and methane carbon isotopic fractionation from Triassic-Jurassic hydrocarbon source rocks in the Kuqa depression of Tarim Basin are obtained. The activation energies of methane generated from Jurassic coal, Jurassic mudstone and Triassic mudstone in the Kuqa Depression are 197-268 kJ/mol, 180-260 kJ/mol and 214-289 kJ/mol, respectively, and their frequency factors are 5.265×10^13 s^-1, 9.761×10^11 s^-1 and 2.270×10^14 s^-1. This reflects their differences of hydrocarbon generation behaviors. The kinetic parameters of methane carbon isotopic fractionation are also different in Jurassic coal, Jurassic mudstone and Triassic mudstone, whose average activation energies are 228 kJ/mol, 205 kJ/mol and 231 kJ/mol, respectively. Combined with the geological background, the origin of natural gas in the Yinan-2 gas pool is discussed, and an accumulation model of natural gas is thus established. The Yinan- 2 gas is primarily derived from Jurassic coal-bearing source rocks in the Yangxia Sag. Main gas accumulation time is 5-0 Ma and the corresponding Ro is in the range from 1.25 %-1.95 %. The loss rate of natural gas is 25 %-30 %.

关键词： hydrocarbon source rock methane generation carbon isotopic fractionation kinetics Kuqa Depression Tarim Basin

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The upper limit of maturity of natural gas generation and its implication for the Yacheng formation in the Qiongdongnan Basin,China

The upper limit of maturity of natural gas generation and it...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Long Su Jianjing Zheng Guojun Chen Gongcheng Zhang Jianming Guo Yongchang Xu Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of the Chinese Academy of Sciences Research Institute of China National Offshore Oil Corporation

Vitrinite reflectance(VR,Ro%) measurements from residual kerogen of pyrolysis experiments were performed on immature Maoming Oil Shale substituted the samples for the gas-prone source rocks of Yacheng formation of the Qiongdongnan Basin in the South China *** work was focused on determination an upper limit of maturity for gas generation(ULMGG) or "the deadline of natural gas generation". Ro values at given temperatures increase with increasing temperature and prolonged heating time,but ARo-value,given a definition of the difference of all values for VR related to higher temperature and adjacent lower temperature in open-system non-isothermal experiment at the heating rate of 20℃/ min,is better than *** representative examples are presented in this *** indicates that the range of natural gas generation for Ro in the main gas generation period is from 0.96%to 2.74%,in which ARo is in concordance with the stage for the onset and end of the main gas generation period corresponding to 0.02%up to 0.30%and from 0.30%up to 0.80%,*** the main gas generation period of 0.96-2.74%,the evolution of VR approach to the ULMGG of the whole rock for type II *** is equal to 4.38%of VR,where the gas generation rates change little with the increase of maturation,ARo is the maximum of 0.83%corresponding to VR of 4.38%Ro,and the source rock does not nearly occur in the end process of hydrocarbon gas generation while Ro is over 4.38%.It shows that it is the same the ULMGG from the whole rock for typeⅡkerogen as the method with both comparison and *** comparing to both the conclusions of pyrolysis experiments and the data of VR from the source rock of Yacheng formation on a series of selected eight wells in the shallow-water continental shelf area,it indicate that the most hydrocarbon source rock is still far from reaching ULMGG from the whole rock for typeⅡkerogen. The source rock of Yacheng formation in the local areas of the deepwater continenta

关键词： hydrocarbon source rock Yacheng Formation Pyrolysis experiment Upper limit of maturity for natural gas generation Qiongdongnan Basin

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