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High-Resolution Transgressive-Regressive Sequence Stratigraphy of Chang 8 Member of Yanchang Formation in Southwestern Ordos Basin,Northern China

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Journal of Earth Science 2010年第4期21卷 423-438页

作者：吕明胜陈开远薛良清衣丽萍朱红涛 Research Institute of Petroleum exploration & Development PetroChina School of Energy Resources China University of Geosciences China National Oil and Gas exploration and Development Corporation Faculty of Earth Resources China University of Geosciences

The reservoirs within the Chang 8 Member of Yanchang(延长) Formation in the southwestern Ordos basin are characterized by low *** is significant to build a high-resolution sequence stratigraphic framework for the exploration and development of these *** on an integrated investigation of well logs,seismic data,cores and outcrops,the Chang 8 Member is interpreted as a 3rd-order transgressive-regressive(T-R) sequence,which consists of six 4.h-order T-R sequences,namely,K1,K2.K3,K4.K5 and K6,respectively,from base to *** 4.h-order sequence comprises a transgressive systems tract overlain by a regressive systems *** K1 to transgressive systems tract of K4.it is characterized by the landward shifts of facies and overall retrogradational sequence stacking pattern due to accommodation increase more than sediment supply during the 3rd-order base-level *** distributary channels are mainly deposited in the transgressive systems tracts,and the interdistributary bays,sheet sands,and small-scale mouth bars are primarily developed in the regressive systems tracts in response to the 4.h-order base-level *** the regressive systems tracts of K4.to K6,it is characterized by the basinward shifts of facies and overall progradational sequence stacking pattern because of accommodation increase less than sediment supply during a fall in 3rd-order base *** distributary channels are mainly accumulated in the transgressive systems tracts,and distributary channels and mouth bars are deposited in the regressive systems tracts as a result of the 4.h-order base-level *** stratigraphic and sedimentological analyses indicate that sequences K1,K2.K5 and K6,as well as the basin edge of K3 and K4.remain potential for exploration and development due to their high reservoir quality in response to the low accommodation and more sediment supply.

关键词： transgressive-regressive sequence base level sediment supply sequence stratigraphic framework Ordos basin.

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Preliminary study on the origin identification of natural gas by the parameters of light hydrocarbon

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Science China Earth Sciences 2008年第S1期51卷 131-139页

作者： HU GuoYi 1,2.3 ,LI Jian 1,2.,LI Jin 1,2.,LI ZhiSheng 1,2.,LUO Xia 1,2.,SUN QingWu 1,2.&MA ChengHua 1,2.1 Research Institute of Petroleum exploration and Development(Langfang Branch),petrochina,Langfang 065007,China 2.The Key Laboratory of Gas Formation and Development,petrochina,Langfang 065007,China 3 College of Geo-Resources and Information,China University of Petroleum,beijing 102.00,China petrochina Res Inst Petr Explorat & Dev Langfang Branch Langfang 065007 Peoples R China petrochina Key Lab Gas Format & Dev Langfang 065007 Peoples R China China Univ Petr Coll Georesources & Informat Beijing 102200 Peoples R China

The light hydrocarbon composition of 2.9 natural gas samples and individual light hydrocarbon carbon isotopes of 53 natural gas samples from typical humic-sourced gas and sapropelic-sourced gas in the four basins of China have been determined and *** identification parameters for humic-sourced gas and sapropelic-sourced gas are proposed or *** differences of compound-specificδ13C value of individual light hydrocarbon between humic-sourced gas and sapropelic-sourced gas have been *** humic-sourced gas has the distribution ofδ13C benzene > -2.‰,δ13C toluene >-2.‰,δ13C cyclohexane >-2.‰andδ13C methyl cyclohexane >-2.‰,while the sapropelicsourced gas has the distribution ofδ13C benzene 2.‰,δ13C toluene 2.‰,δ13C cyclohexane 2.‰and δ13C methyl cyclohexane 2.‰.Among the components of C7 light hydrocarbon compound,such as normal heptane(nC7),methyl cyclohexane(MCH)and dimethyl cyclopentane(ΣDMCP),etc,relative contents of nC7 and MCH are influenced mainly by the source organic matter type of natural ***,it is suggested that the gas with relative content of nC7 of more than 30%and relative content of MCH of less than 70%is sapropelic-sourced gas,while gas with relative content of nC7 of less than 35%and relative content of MCH of more than 50%is humic-sourced *** components of C5-7 aliphatics, the gas with relative content of C5-7 normal alkane of more than 30%is sapropelic-sourced gas,while the gas with relative content of C5-7 normal alkane of less than 30%is humic-sourced *** paremeters have been suggested to identify humic-sourced gas and sapropelic-sourced gas.

关键词： natural gas humic-sourced gas sapropelic-sourced gas carbon isotope light hydrocarbon parameters

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Discovery of a Late Permian Angara-Cathaysia mixed flora from Acheng of Heilongjiang,China,with discussions on the closure of the Paleoasian Ocean

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Science China Earth Sciences 2009年第12期52卷 1746-1755页

作者： DENG ShengHui1,2. WAN ChuanBiao3 & YANG JianGuo3 1 Research Institute of Petroleum exploration and Development, petrochina, {2. 100083, China 2.State Key Laboratory of Enhanced Oil Recovery, {2. 100083 China 3 Daqing Institute of Petroleum exploration and Development, petrochina, Daqing 164.12. China Research Institute of Petroleum exploration and Development PetroChina Beijing 100083 China State Key Laboratory of Enhanced Oil Recovery Beijing 100083 China Daqing Institute of Petroleum exploration and Development PetroChina Daqing 164712 China

This work documents a new flora from the Upper Permian Hongshan Formation of Acheng County, Heilongjiang Province, Northwest China. The flora consists of 2. species: Paracalamites sp., Pecopteris tangwangheensis Huang, Callipteris obese Huang, Callipteris shenshuensis Huang, C. tangwangheensis Huang, C. heilongjiangensis Huang, C. zeilleri Zalessky, C. sp., Comia yichunensis Huang, C. tenueaxis Huang, Iniopteris sibirica Zalessky, Supaia teiliensis Huang, Compsopteris tchirkovae Zalessky, C. cf. adzvensis Zalessky, Nilssonia sp. 1, Nil. sp. 2. Taeniopteris cf. densissima Halle, T. cf. nystraemii Halle, T. sp. and Noeggerathiopsis derzavinii Neub. It is dominated by Angara species but mixed with some typical Cathaysian elements. The age of the flora is assigned to late of the Late Permian according to the stratigraphic ranges of the known species and the comparisons of it with the similar floras. The new discovery indicates that the final collision between the North China Plate and Siberian Plate occurred in Late Permian along the Xar Moron River-Changchun-Yanji sutured zone, and the Paleoasian Ocean was finally closed at the end of the Permian.

关键词： Late Permian mixed Angara-Cathaysia flora Paleoasian Ocean plate collision Heilongjiang Province of China

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Land cover changes based on plant successions: Deforestation, rehabilitation and degeneration of forest in the upper Dadu River watershed

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Science China Earth Sciences 2005年第12期48卷 2214-2230页

作者： YAN Jianzhong1,2.3, ZHANG Yili1, BAI Wanqi1, LIU Yanhua4. BAO Weikai5, LIU Linshan1, 2.& ZHENG Du1 1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, beijing 100101, China 2. Graduate School of the Chinese Academy of Sciences, beijing 100039, China 3. College of Resources and Environment, Southwest Agricultural University, Chongqing 4.0716, China 4. The Ministry of Science and Technology, P. C. China, beijing 100862. China 5. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 61004., China 1. Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences 100101 Beijing China 2. Graduate School of the Chinese Academy of Sciences 100039 Beijing China 3. College of Resources and Environment Southwest Agricultural University 400716 Chongqing China 4. The Ministry of Science and Technology P. C. China 100862 Beijing China 5. Chengdu Institute of Biology Chinese Academy of Sciences 610041 Chengdu China

To link regional land use/cover changes with environmental effects, land cover changes are required to reflect vegetation successions, whereas the land cover classification systems commonly used nowadays cannot serve this purpose. In this paper, a new land cover classification system is established in which land covers are classified by the vegetation succes-sions, taking Zamtang County, Barkam County and Jinchuan County in the upper Dadu River watershed as a study area. Using multi-temporal remote sensing images, the land cover data of 1967, 1986 and 2.00 are obtained by means of integration of unsupervised classification and visual interpretation methods. The database facilitates the study of land use/cover changes, en-vironmental effects and ecological construction. Land cover changes reflect the main ecological processes in the upper Dadu River watershed. The landscape composed mainly of grasslands, wildwoods and alpine scrubs in 1967 was changed to that of grasslands, secondary forests, al-pine scrubs, fragmentary wildwoods, artificial forests, secondary scrubs in 2.00, meanwhile, the landscape got more fragmentized. The total area of the forests decreased by 9.4.%. Study results have shown the process of restoration of logged areas in forest centers. From 1967 to 2.00, only 6.86 percents of logged areas were converted to shrubs, meadows or crop-lands, and the rest were converted into artificial forests or secondary forests. So the ecological shelter functions will be restored, stage by stage. Firewood collection, charcoal production and overgrazing are the three major triggers for the extensive degradation of alpine oak forests, Sa-bina tibetica forests and meadows. The arid valley grasslands expanded too. The degradation of vegetation in the southern slopes impairs ecological shelter functions and affects livelihood of local residents, so it is essential to find effective measures for ecological restoration and recon-struction. Field investigations have found

关键词： land use/cover classification, upper Dadu River watershed, vegetation successions, GIS, RS.

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Controlling Factors Affecting Pressure Differential Development of the Upper Paleozoic Gas Reservoir in the Sulige and Yulin Area of the Ordos Basin

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地学前缘 2009年第S1期16卷 126-127页

作者： Hao Xu~1,Junfeng Zhang~2.Chengzao Jia~3,Dazhen Tang~1,Ming Li~3,Wenzhong Zhang~1 1.Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,Ministry of Education,China University of Geosciences(beijing),beijing 100083,China. 2.{2. exploration and {4. Company,beijing 10072.,China 3.Research Institute of Petroleum exploration & Development,beijing 100083,China

The origin and distribution of Upper Paleozoic reservoirs pressure in mid-northem Ordos Basin has attracted widespread attention in recent *** reservoir pressure of Sulige area shows characteristics of basically subnormal pressure,and the reservoir pressure of Yulin area shows characteristics of basically normal hydrostatic *** the sense of structural location,

关键词： Ordos Basin Sulige area Yulin area formation pressure controlling factors

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Effects of abnormally high heat stress on petroleum in reservoir——An example from the Tazhong 18 Well in the Tarim Basin

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Science China Earth Sciences 2008年第4期51卷 515-527页

作者： ZHU DongYa1, JIN ZhiJun1, HU WenXuan2.& ZHANG XueFeng3 1 Petroleum exploration and production Institute, China Petroleum & Chemical Corporation, {2. 100083, China 2.Department of Earth Sciences, Nanjing University, Nanjing 2.0093, China 3 School of Resource and Information, China University of Petroleum, {2. 102.4., China Petroleum exploration and production Institute China Petroleum & Chemical Corporation Beijing China Department of Earth Sciences Nanjing University Nanjing China School of Resource and Information China University of Petroleum Beijing China

An igneous intrusion of 94. thick was discovered intruding into the Silurian sandstone from Tazhong 18 Well. The petroleum previously preserved in the Silurian sandstone reservoir was altered into black carbonaceous bitumen by abnormally high heat stress induced by the igneous intrusion. The reflec-tance of the carbonaceous bitumen reaches as high as 3.54., indicating that the bitumen had evolved into a high thermal evolution level. Similar to the Silurian samples from the neighboring Tazhong 11, Tazhong 12. Tazhong 4. and Tazhong 4. wells, the distribution of C2., C2. and C2. steranes of the car-bonaceous bitumen is still "V" -shaped and can still be employed as an efficient parameter in oil source correlation. The "V" -shaped distribution indicates that the hydrocarbons from the Tazhong 18 and the neighboring wells were all generated from the Middle-Upper Ordovician hydrocarbon source rocks. However, the oil source correlation parameters associated with and terpanes had been changed greatly by the high heat stress and can no longer be used in oil source correlation. The δ 13C values of the pe-troleum from the neighboring wells are between -32.53‰ and -33.37‰, coincident with those of the Paleozoic marine petroleum in the Tarim Basin. However, the δ 13C values of the carbonaceous bitumen from the Tazhong 18 Well are between -2..18‰ and -2..2.‰, isotopically much heavier than the pe-troleum from the neighboring wells. The content of light hydrocarbons (nC14.nC2.) of the saturated hydrocarbon fraction in the carbonaceous bitumen is extremely higher than the content of heavy hy-drocarbons. The light/heavy hydrocarbon ratios (ΣnC2.-/ΣnC2.+) are between 4.56 and 39.17. In the saturated fraction, the even numbered hydrocarbons are predominant to the odd numbered, and the OEP (Odd to Even Predominance) values are between 0.2. and 0.4.. However, the content of light hy-drocarbons in the petroleum from the neighboring wells is relatively low and the content of the even numb

关键词： Tarim Basin igneous intrusive abnormally high heat stress bitumen carbon isotope PAH

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Complex petroleum accumulating process and accumulation series in the buried-hill trend in the rift basin:An example of Xinglongtai structure trend,Liaohe subbasin

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Science China Earth Sciences 2008年第S2期51卷 108-116页

作者： GAO XianZhi1,PANG XiongQi1,LI XiaoGuang2.CHEN ZhenYan2.SHAN JunFeng2.LIU Feng1,ZOU ZhiWen1 & Li WeiLian1 1 Faculty of Resources and Information Technology,China University of Petroleum,beijing 102.4.,China 2.exploration and Development Institute of Liaohe Oilfield,{2. Liaohe Oil Company,Panjin 12.010,China China Univ Petr Fac Resources & Informat Technol Beijing 102249 Peoples R China petrochina Liaohe Oil Co Explorat & Dev Inst Liaohe Oilfield Panjin 124010 Peoples R China

The buried-hill trend is a typical style of the petroliferous structure in the faulted basin of eastern China. The Xinglongtai structure trend in the Liaohe subbasin,Bohai Bay Basin is a buried faulted-hill trend resulting from the periodic faulting of the Tai’an-Dawa faults. The structure was cut by various faults,which are interlinked and constitute the conduits for petroleum migration. Petroleum accumulated in the Tertiary sandstones and pre-Tertiary basement of metamorphosed rocks through the migration pathways of the fault system. Petroleum in the structure was derived from different hydrocarbon kitchens to form a hybrid field complex. Petroleum charged the structure from different directions and accumulated in various reservoirs through different pathways in different times. The accumulations in the buried hill trend of Xingongtai are composed of two types of traps in the two stratigraphic systems: traps in the Tertiary sandstones were formed by the fault blocks and by the pinchout of the sandstone,and traps in the pre-Tertiary basement of metamorphosed rocks were formed by fissures in the inner part of the buried hills and by the unconformity near the surface of the buried hills.

关键词： faulted basin petroleum migration and accumulation petroleum occurrence buried hills Achaean basement Liaohe subbasin Bohai Bay basin

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Effect of stress sensitivity on displacement efficiency in CO_2.flooding for fractured low permeability reservoirs

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Petroleum Science 2009年第3期6卷 277-283页

作者： Wang Rui Yue Xiang＇an Zhao Renbao Yan Pingxiang Dave Freeman Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China SINOPEC exploration ＆ production Research Institute Beijing 100083 China China Power Complete Equipment Co. Ltd. Beijing 100011 China Edwy R. Brown Department of Petroleum Engineering Marietta College U.S.A.

Carbon dioxide flooding is an effective means of enhanced oil recovery for low permeability reservoirs. If fractures are present in the reservoir, CO2.may flow along the fractures, resulting in low gas displacement efficiency. Reservoir pore pressure will fluctuate to some extent during a CO2.flood, causing a change in effective confining pressure. The result is rock deformation and a reduction in permeability with the reduction in fracture permeability, causing increased flow resistance in the fracture space. Simultaneously, gas cross flowing along the fractures is partially restrained. In this work, the effect of stress changes on permeability was studied through a series of flow experiments. The change in the flowrate distribution in a matrix block and contained fracture with an increase in effective pressure were analyzed. The results lead to an implicit comparison which shows that permeability of fractured core decreases sharply with an increase in effective confining pressure. The fracture flowrate ratio declines and the matrix flowrate ratio increases. Fracture flow will partially divert to the matrix block with the increase in effective confining pressure, improving gas displacement efficiency.

关键词： Stress sensitivity flowrate distribution matrix fracture CO2.flooding displacement efficiency

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Formation mechanism and geochemical characteristics of shallow natural gas in heavy oil province,China

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Science China Earth Sciences 2008年第S1期51卷 96-106页

作者： ZHU GuangYou,ZHANG ShuiChang,ZHAO WenZhi,WANG ZhengJun,LIANG YingBo, ZHAO XueFeng&ZHANG JingYan petrochina Oil Geologic Lab Center,Research Institutes of petrochina {2. and Development,beijing 100083,China petrochina Oil Geol Lab Ctr Res Inst PetroChina Explorat & Dev Beijing 100083 Peoples R China

Shallow gas reservoirs are distributed widely in Chinese heavy oil-bearing *** present,shallow gas resources have opened up giant *** previous researches indicate the intimate genetic relationship between shallow gas and heavy *** gas resources are generated from crude oil degraded by anaerobic microscopic organism,it belongs to biogenic gas family of secondary genesis, namely heavy oil degraded *** gas resources are usually distributed in the upward position or the vicinity of heavy oil *** are mainly of dry gas,which are composed of methane and only tiny C2.+ heavy hydrocarbon and relatively higher contents of nitrogen ***,methane isotopes are light,whose values are between biogenic gas and thermal cracking *** isotopes are heavy,which mixed possibly with thermogenic *** dioxide bear the characteristics of very heavy carbon isotope,so carbon isotopic fractionation effects are very obvious on the process of microscopic organism degradation crude *** heavy oil degraded gas formation,a very complex geological,geochemical and microbiological geochemical process,is the result of a series of reactions of organic matter-microbes and water-hydrocarbon,which is controlled by many factors.

关键词： heavy oil degraded gas shallow gas heavy oil biogenic gas anaerobic degradation

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中国陆上天然气资源的特征及发展策略

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石油学报 2004年第5期25卷 1-5页

作者：赵贤正赵政璋李景明李东旭石油大学北京102249 中国石油勘探与生产公司北京100011 中国石油勘探开发研究院廊坊分院河北廊坊065007

对中国陆上天然气资源的基本特征作了全面分析 ,其特征主要表现为 :①天然气勘探程度不高 ,资源相对丰富 ,主要集中分布于四个气区 ;②天然气成藏特点明显 ,类型差别较大 ;③目前天然气勘探进入大发现时期 ,天然气产量大幅度增长 ,储采... 详细信息

对中国陆上天然气资源的基本特征作了全面分析 ,其特征主要表现为 :①天然气勘探程度不高 ,资源相对丰富 ,主要集中分布于四个气区 ;②天然气成藏特点明显 ,类型差别较大 ;③目前天然气勘探进入大发现时期 ,天然气产量大幅度增长 ,储采比暂时较高。根据目前勘探开发状况 ,今后加快天然气发展的策略应是 :①突出重点 ,继续加强天然气勘探 ;②加强提高单井产能的工程技术攻关 ,降低开发成本 ;③转变开发理念 ,提高管理水平 ;④通过体制创新 ,提高开发效益。

关键词：天然气工业发展策略中国天然气资源储量复合圈闭岩性

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