d ABSTRACTCHINA PETROLEUM EXPLORATION ABSTRACT Oil Gas Resources Status and the Exploration Fields in China /Qu Hui, Zhao Wenzhi and Hu suyun / Petrochina Research Abstract: Oil and gas resources are abundant in China. Although the exploration extent of the main petroliferous basins is high after long ime exploration, the amount of remained oil and gas resources is still large, and it has the resource base for further development. Afte oil and gas exploration in tens of years, the preservation conditions of remained oil resources become worse"and the pr uality resources was augmented, the remained oil and gas resources in subtle oil and gas reservoirs is enlarged and oil and gas exploration in China will be broad in the future, not only has four big real istic exple carbonate rocks and"low-quality"resources Key words: oil gas resources, oil gas exploration; exploration field Beijing 100083: 2 Postdoctor Workstation of PetroChina Tarim Oilfield, Korla City, Xinjiang 410a, Tarim Basin/Zhao Zongju'-2, Key Factors ofOil-gas Reservoir-forming and Exploration Targets in Ordovician in Tazhong Area, Tarim Basin/ Zhao Zongju2, ia Chengzao, Zhou Abstract: Synthetically analyzing on the oil-gas pools formation and losing reasons of over 60 drilling wells in Ordovician in Tazhong rea, Tarim basin, the key factors to form Ordovician oil-gas reservoirs in this area are as below: 1 )the important source rocks, which are corresponding to Heituwa Formation and Sha'ergan Fomation in Middle-Upper Ordovician, control the distribution of oil and gas in nal hill karst reservoir generated from Silurian to Devonian(EKR-1), paleo-burial hill karst reservoir formed from later Middle Ordovician to early Late Ordovician(Liandeilo to early Caradoc)(EKR-2), shelf marginal reef-shoal burial karst reservo ir in Upper Ordovician Lianglita Formation and Lower Ordovi terlayer dolomite reservoir, pla rtant role in forming diagenetic -lithologic oil-gas traps (3 )the main reservoir-forming stage of commercial oil reservoirs at present would be from Permian to Early Triassic in Tazhong area; (4) of Ordovician in Tazhong area, it is suggested that three stages should be conducted, including in the near term, the ultra-large lithol oil-gas reservoirs of Lianglitage Formation distributed in shelf marginal reef-shoal in the southern side of Tazhong-I fault belt should be firstly explored, at the same time, the Lower Ordovician oil-gas pools distributed in eastern part of central fault-horst belt from Tazhol 401 to Tazhong-9 well block should also be explored; secondly, the paleo-burial hill oil-gas pools in the middle and upper part of and Lower Ordovician in the area of Tazhong-1-Tazhong-7-Tazhong-48 well blocks should be explored; if existing the fault to link source rocks, the structural and stratigraphy traps with turbidite sandstones, shelf-delta, and shore-tidal sandstones in Upper Ordovician in Manjiaer Key words: reservoir forming; source rocks; carbonate reservoir; losing reason; exploration target; Ordovician; Tarim Basin Coupling relation between Tabei Foreland Basin and Nantianshan Orogenic Belt and Their Oil-gas Distribution Feature/Tian Center: Petro China Research Institute of Petroleum Exploration and Development, Beijing 100083 Abstract: Nantianshan orogenic belt and Tabei foreland basin is a pair of structural unit with conjugated and positive-negative deper divided into six structural units, inclue verdun d g zone resulted from basem ing zone, Kula front imbricate thrusting zone, Baicheng eep depression zone, Tabei foreland zone and Taz ement of Nantianshan orogenic belt and Tabei asin controlled together the sedim characteristics, deformation feature and structural styles of Tabei foreland basin. Oil and gas resources is rich in Tabei foreland basi which has favorable reservoir-forming conditions. The distribution of oil and gas si structural zone, Yiqikelike structural zone, cover. There are four structural zones with oil-gas enrichment, which include Kela inly dominated by, petroleum system and regional structural zone and Luntai fault-uplift zone, where Kale-2 ultra-large gasfield and other several oil and gas fields are disco vered, and the dded large oil and gas fields will be discovered Key words: basin-mountain coupling; Tabei foreland basin; Nantianshan orogenic belt, structural feature, large oil and gas field Comparison of oil-gas Geologic Condition between North and South Foreland-thrust Belts in Tianshan Mountains and Favorable Exploration Target/Jia Jindou// Petro China Research Institute of petroleum Exploration and Development, Beijing 100083 Abstract: Mesozoic-Cenozo ic foreland thrusting belts occurred in Kuqa and in the southern margin of Jung gar Basin, distributed in both north and south sides of Tianshan orogenic belt, whose formation and evolution have heavily affected and controlled the basins both sides. In the process of same one regional stress field, the tectonic evolution and oil and gas geologic condition of Kuqa foreland thrusting belt and the southern margin of Junggar Basin all show much similar characteristics, both of them developed multi-set mature source rocks, and formed multi-set high-quality reservoir-cover cor binations, and developed various traps. Because the relation among source rock, reservoir and cover is well matched, providing the material basement for forming large oil and gas fields Key words: Tianshan orogenic belt; Kuqa, southern margin of Junggar Basin; foreland thrusting belt, tectonic feature, oil and gas distribution A Role of Marine Paleo-uplift in Reservoir-forming of oil and Gas/Wang Zecheng and Zhao Wenzhu/Petro China Research Institute Abstract: Marine paleo-uplift is referred to as the important field of oil and gas enrichment for medium-lower combination in Chinese superimposed basin, which can be divided into four types: inheriting type, sediment-control type(stratigraphic pinch out and reef beach in th block and monoclinal type) Based on the difference between the texture feature and reservoir-forming feature of oil and gas of marine paleo-uplift, four types of reservoir-foming combinations in paleo-uplift are shown as following: in vertical, the reservoir-forming combinations consist of the top, crust of weathering and innerepisode ones, in plane, the reservoir-foming combinations include the core of l No 4 2006 ChinaPetroleum Exploration I c1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.netABSTRACT ABSTRACT C H I N A P E T R O L E U M E X P L O R A T I O N No.4 2006 China Petroleum Exploration Ⅰ Oil & Gas Resources Status and the Exploration Fields in China /Qu Hui,Zhao Wenzhi and Hu suyun // Petrochina Research Institute of Petroleum Exploration and Development,Beijing 100083 Abstract:Oil and gasresources are abundant in China. Although the exploration extent of the main petroliferous basinsis high after long time exploration, the amount of remained oil and gas resources isstill large, and it has the resource base for further development. After oil and gas exploration in tens of years,the preservation conditions of remained oil resources become worse£¬and the proportion of low￾quality resourceswas augmented,the remained oil and gasresourcesin subtle oil and gasreservoirsis enlarged£¬and oil and gas exploration is getting more difficult. Oil and gas exploration field in China will be broad in the future, not only has four big realistic exploration fields, include the fine exploration in mature basin, the litho-stratigraphic reservoirs, the foreland and the lower-medium combination of superimposed basin, but also has some new exploration fields like Qinghai and Tibet, the south of the South China Sea, the marine carbonate rocks and "low-quality" resources. Key words:oil & gas resources; oil & gas exploration; exploration field Key Factors of Oil-gas Reservoir-forming and Exploration Targetsin Ordovician in Tazhong Area, Tarim Basin /Zhao Zongju 1,2 , Jia Chengzao 1 ,Zhou Xinyuan 2 and Wang Zhaoming 2 // 1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing100083; 2 Postdoctor Workstation of PetroChina Tarim Oilfield, Korla City, Xinjiang 841000 Abstract: Synthetically analyzing on the oil-gas pools formation and losing reasons of over 60 drilling wellsin Ordovician in Tazhong area, Tarim basin, the key factorsto form Ordovician oil-gasreservoirsin this area are as below: (1)the important source rocks, which are corresponding to Heituwa Formation and Sha'ergan Formation in Middle-Upper Ordovician, control the distribution of oil and gas in northern slope of Tazhong uplift; (2)the distribution and heterogenesis of foursets of carbonate reservoirs, such as paleo-burial hill karst reservoir generated from Silurian to Devonian (EKR-1), paleo-burial hill karst reservoir formed from later Middle Ordovician to early Late Ordovician (Liandeilo to early Caradoc) (EKR-2), shelf marginal reef-shoal burial karst reservoir in Upper Ordovician Lianglitage Formation and Lower Ordovician interlayer dolomite reservoir , play a very important role in forming diagenetic-lithologic oil-gastraps; (3)the main reservoir-forming stage of commercial oil reservoirs at present would be from Permian to Early Triassic in Tazhong area; (4) the conditions of traps, cap rocks and oil-gas conservation controlled the scale of oil-gas pools. Asto oil-gas exploration targets and steps of Ordovician in Tazhong area, it issuggested that three stagesshould be conducted, including in the near term, the ultra-large lithologic oil-gasreservoirs of Lianglitage Formation distributed in shelf marginal reef-shoal in the southern side of Tazhong-I fault belt should be firstly explored, at the same time, the Lower Ordovician oil-gas pools distributed in eastern part of central fault-horst belt from Tazhong- 401 to Tazhong-9 well block should also be explored; secondly, the paleo-burial hill oil-gas pools in the middle and upper part of Yingshan Formation in Lower Ordovician distributed in Tazhong-10 structural belt and the area between it and central fault-horst belt, and Lower Ordovician in the area of Tazhong-1-Tazhong-7-Tazhong-48 well blocks should be explored; if existing the fault to link source rocks, the structural and stratigraphy traps with turbidite sandstones, shelf-delta, and shore-tidal sandstones in Upper Ordovician in Manjia'er sag can be explored. Key words: reservoir forming; source rocks; carbonate reservoir; losing reason; exploration target; Ordovician; Tarim Basin Coupling Relation between Tabei Foreland Basin and Nantianshan Orogenic Belt and Their Oil-gas Distribution Feature/Tian Zuoji // Oversea Research Center, PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083 Abstract: Nantianshan orogenic belt and Tabei foreland basin is a pair ofstructural unit with conjugated and positive-negative dependence on each other, which can be divided into six structural units, including Laerdun deep thrusting zone resulted from basement engulfing, Haerkeshan fold thrusting zone, Kula front imbricate thrusting zone, Baicheng-Yangxia foredeep depression zone, Tabei foreland slope zone and Tazhong front uplift. The evolvement of Nantianshan orogenic belt and Tabeiforeland basin controlled together the sedimentary characteristics, deformation feature and structural styles of Tabei foreland basin.Oil and gas resources is rich in Tabei foreland basin, which has favorable reservoir-forming conditions. The distribution of oil and gas ismainly dominated by petroleum system and regional cover. There are fourstructural zones with oil-gas enrichment, which include Kelasu structural zone, Yiqikelike structural zone, Qiulitage structural zone and Luntai fault-uplift zone, where Kale-2 ultra-large gasfield and other several oil and gas fields are discovered, and the added large oil and gas fields will be discovered. Key words: basin-mountain coupling; Tabei foreland basin; Nantianshan orogenic belt; structural feature; large oil and gas field Comparison ofOil-gasGeologic Condition between North and South Foreland-thrust Beltsin TianshanMountains and Favorable Exploration Target/ Jia Jindou// PetroChina Research Institute of Petroleum Exploration and Development, Beijing100083 Abstract: Mesozoic-Cenozoic foreland thrusting belts occurred in Kuqa and in the southern margin of Junggar Basin, distributed in both north and south sides of Tianshan orogenic belt, whose formation and evolution have heavily affected and controlled the basins distribution, basement property, the scale ofsedimentary cover and texture feature of whole basin and late destroying distributed in its both sides. In the process ofsame one regional stressfield, the tectonic evolution and oil and gas geologic condition of Kuqa foreland thrusting belt and the southern margin of Junggar Basin all show much similar characteristics, both of them developed multi-set mature source rocks, and formed multi-set high-quality reservoir-cover combinations, and developed various traps. Because the relation among source rock, reservoir and cover is well matched, providing the material basement for forming large oil and gas fields. Key words:Tianshan orogenic belt; Kuqa; southern margin ofJunggarBasin;foreland thrusting belt; tectonic feature; oil and gas distribution A Role of Marine Paleo-uplift in Reservoir-forming of Oil and Gas/Wang Zecheng and Zhao Wenzhi//PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083 Abstract: Marine paleo-uplift is referred to as the important field of oil and gas enrichment for medium-lower combination in Chinese superimposed basin, which can be divided into four types: inheriting type, sediment-control type (stratigraphic pinch out and reef beach in the margin of platform), finalized shape in later stage (fault uplifting and extrusion folding), reconstructing type in later stage (fault￾block and monoclinal type). Based on the difference between the texture feature and reservoir-forming feature of oil and gas of marine paleo-uplift, four types of reservoir-forming combinations in paleo-uplift are shown as following: in vertical, the reservoir-forming combinations consist of the top, crust of weathering and inner episode ones; in plane, the reservoir-forming combinationsinclude the core of