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Origin and accumulation of high-maturity oil and gas in deep parts of the Baxian Depression, Bohai Bay Basin, China

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Petroleum Science 2013年第3期10卷 303-313页

作者： zhao xianzheng Jin Qiang Jin Fengming Ma Peng Wang Quan Wang Jing Ren Chunling Xi Qiuling School of Geosciences China University of Petroleum Huabei Oilfield Company of PetroChina

Great quantities of light oil and gas are produced from deep buried hill reservoirs at depths of 5,641 m to 6,027 m and 190 ℃ to 201 ℃ in the Niudong-1 Well, representing the deepest and hottest commercial hydrocarbons discovered in the Bohai Bay Basin in eastern China. This discovery suggests favorable exploration prospects for the deep parts of the basin. However, the discovery raises questions regarding the genesis and accumulation of hydrocarbons in deep reservoirs. Based on the geochemical features of the hydrocarbons and characteristics of the source rocks as well as thermal simulation experiments of hydrocarbon generation, we conclude that the oil and gas were generated from the highly mature Sha-4 Member （Es4） source rocks instead of thermal cracking of crude oils in earlier accumulations. The source kitchen with abnormal pressures and karsted carbonate reservoirs control the formation of high-maturity hydrocarbon accumulations in the buried hills （i.e., Niudong-1） in conjunction with several structural-lithologic traps in the ES4 reservoirs since the deposition of the upper Minghuazhen Formation. This means the oil and gas exploration potential in the deep parts of the Baxian Depression is probably high.

关键词： High mature oil and gas origin accumulation deep part of Baxian Depression

Fine-grained rock fabric facies classification and its control on shale oil accumulation: a case study from the Paleogene Kong 2 Member, Bohai Bay Basin

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Frontiers of Earth Science 2021年第2期15卷 423-437页

作者： Wenzhong HAN xianzheng zhao Xiugang PU Shiyue CHEN Hu WANG Yan LIU Zhannan SHI Wei ZHANG Jiapeng WU School of Earth Science and technology China University of Petroleum(East China)Qingdao 266580China Dagang Oil Field Company of PetroChina Tianjin 300280China Key Laboratory of Exploration Technologies for Oil and Gas Resources(Ministry of Education) Yangtze UniversityWuhan 430100China

Lacustrine shale oil resources in China are abundant,with remarkable exploration breakthroughs being *** to marine shale oil in North America,efficient exploration of lacustrine shale oil is more difficult;thus,selecting favorable layer and optimization zone for horizontal wells is more *** this study,based on systematic coring of approximately 500 m fine-grained deposits of the Kong 2 Member,combining laboratory tests and log data,source rock geochemistry and reservoir physical properties,the favorable rock fabric facies for oil accumulation was analyzed and ***,the dominant lithologic facies,organic facies,and bed combination facies were determined based on mineral composition from logging,total organic content(TOC),and sedimentary ***,10 fabric facies were classified by combining these three facies,with 4 fabric facies were found to have high TOC content,high total hydrocarbon,and strong fluorescence features,indicating good shale oil ***,the distribution of the upon good fabric facies was identified to be located at the top of the Kong 2 Member,with evidences of seismic resistivity inversion,thermal maturity,structure depth,and strata *** the favorable facies were found to be stably distributed lateral at the area of about 100 *** oil flow has been detected at this layer within this area by several wells,including horizontal *** exploratory study of fabric facies classification and evaluation provides a new research idea for lacustrine shale oil exploration and effectively promotes breakthroughs in lacustrine shale oil exploration in Bohai Bay Basin.

关键词： fabric facies fine grained deposits lithologic facies organic facies Bohai Bay Basin

OUTLOOK OF CHINA’S PETROLEUM EXPLORATION POTENTIAL

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China Oil & Gas 2005年第3期12卷 16-19页

作者： zhao xianzheng Assistant general manager of PetroChina HuabeiOilfield Company

Oil and gas resource situation of China Overall discovered maturity of oil and gas resources not high According to all previous nationwide estimates of oilgas resources, the total resources is relatively abundant in China. The latest resource assessment results, performed by China＇s three national oil companies （CNPC, Sinopec and CNOOC）, also indicate that petroleum exploration still has a solid resource base. According to the latest nationwide petroleum resource assessment results and the proved oil and gas geologic reserves at the end of 2004, the average discovery maturity of recoverable oil reserves is 20% in China, with 40% in east China, 14% in westcentral China and 14.5% in offshore China, reflecting that petroleum exploration is still in middle stage with considerable exploration potential.

关键词：中国石油工业石油开发石油能源

ROUNDUP OF OIL AND GAS EXPLORATION RESULTS OF PETROCHINA IN 2000

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China Oil & Gas 2001年第2期8卷 20-27页

作者： zhao xianzheng He Haiqing

2000 is the first year that PetroChina Company Limited was in operation and issued IPO overseas. All the oil and gas subsidiaries, focusing on the commercial reserves target and depending on technical progress,have ma... 详细信息

关键词： high ROUNDUP OF OIL AND GAS EXPLORATION RESULTS OF PETROCHINA IN 2000 GAS

Geological characteristics and key exploration technologies of continental shale oil sweet spots: A case study of Member 2 of Kongdian Formation in the Cangdong sag in the Huanghua depression, Bohai Bay Basin

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Petroleum Research 2019年第2期4卷 97-112页

作者： xianzheng zhao Xiugang Pu Fengming Jin Wenzhong Han Zhannan Shi Aibing Cai Aiguo Wang Quansheng Guan Wenya Jiang Wei Zhang PetrolChina Dagang Oilfield Company Tianjin300280China

Under the general trend of stepping-up oil and gas exploration and development in China,the unconventional oil and gas resources such as shale oil and gas have become an important *** continental shale oil resources are developed in Member 2 of Kongdian Formation(Ek2)of the Cangdong sag in the Huanghua depression of the Bohai Bay Basin which has complex structure,strong heterogeneity,and large buried depth,thus,the geological characteristic of shale oil accumulation and key exploration technologies are investigated on base of the system coring of 635.8 m,centimeter-level fine description and analysis of over ten thousand samples,therefore,the“four accurate”technologies have been developed,including the accurate selection of sweet spot areas,accurate drilling of sweet spot layers,accurate fracturing of sweet spot layers and accurate measure of fracture-rich *** results show that the continental shale strata in Member 2 of Kongdian Formation can be divided into three types:felsic shale,limy dolomitic shale and mixed *** Member 2 of Kongdian Formation is characterized by diverse mineral components,abundant laminae,good source rocks and medium thermal evolution degree,tight reservoir with rich micropore and microfractures,high oil saturation and brittle mineral content,indicating good prospect of shale oil *** sedimentological study,TOC and Ro evaluation,brittle mineral calculation,and seismic fusion inversion,a total of 126 km^(2) of Class I sweet spots in Member 2 of Kongdian Formation was delineated comprehensively,which guides horizontal well deployment(Well GD1701H and Well GD1702H).The drilling rate of sweet spot of these two horizontal wells is up to 96%by tracing thin layer through fine calibration,locating compartment through fine inversion,ensuring window entry through precise positioning,and tracking sweet spot through *** “one-excellent and five-highs”criterion is used to select perforation points to

关键词： Shale oil Sweet spot evaluation Fracturing intervals and perforation clusters Member 2 of Kongdian formation Cangdong sag Bohai Bay Basin

SHRIMP zircon dating and LA-ICPMS Hf analysis of early Precambrian rocks from drill holes into the basement beneath the Central Hebei Basin,North China Craton

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Geoscience Frontiers 2014年第4期5卷 471-484页

作者： Yusheng Wan xianzheng zhao Zejiu Wang Dunyi Liu Alfred Krner Chunyan Dong Hangqian Xie Yuansheng Geng Yuhai Zhang Runlong Fan Huiyi Sun Institute of Geology Chinese Academy of Geological Sciences Beijing SHRIMP Center Institute of GeologyChinese Academy of Geological Sciences State Key Laboratory for Continental Tectonics and Dynamics Institute of GeologyChinese Academy of Geological Sciences North China Oilfield Company of PetroChina Chinese Academy of Geological Sciences

The Central Hebei Basin （CHB） is one of the largest sedimentary basins in the North China Craton, extending in a northeast-southwest direction with an area of 〉350 km2. We carried out SHRIMP zircon dating, Hf-in-zircon isotopic analysis and a whole-rock geochemical study on igneous and metasedi- mentary rocks recovered from drill holes that penetrated into the basement of the CHB, Two samples of gneissic granodiorite （XG1-1） and gneissic quartz diorite 048-1） have magmatic ages of 2500 and 2496 Ma, respectively. Their zircons also record metamorphic ages of 2.41-2.51 and ～2.5 Ga, respec- tively. Compared with the gneissic granodiorite, the gneissic quartz diorite has higher REE contents and lower Eu/Eu＊ and （La/Yb）n values. Two metasedimentary samples （MG1, H5） mainly contain ～2,5 Ga detrital zircons as well as late Paleoproterozoic metamorphic grains. The zircons of different origins have eHf （2.5 Ga） values and Hf crustal model ages ranging from 0 to 5 and 2.7 to 2,9 Ga, respectively, Therefore, ～2.5 Ga magmatic and Paleoproterozoic metasedimentary rocks and late Neoarchean to early Paleoproterozoic and late Paleoproterozoic tectono-thermal events have been identified in the basement beneath the CHB. Based on regional comparisons, we conclude that the early Precambrian basement beneath the CHB is part of the North China Craton.

关键词： Early PrecambrianNorth China CratonDrill holeZircon datingHf isotopic analysis

Harvest of CNPC's Exploration at the Trun of Centry

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China Oil & Gas 2000年第1期7卷 23-26页

作者： Wan Wei zhao xianzheng (Exploration Department, CNPC)

The Formation and Evolution Mechanism of Tight Oil and Gas in Lacustrine Carbonate Rocks in the Bohai Bay Basin

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 277-278页

作者： TANG Xuan JIANG Zaixing zhao xianzheng ZHANG Ruifeng CHUI Zhouqi HUANG Zhenglin WANG Jimao Key Laboratory of Shale Gas Exploration and Evaluation Ministry of Land and Resources Beijing 100083 China Petrochina Huabei Oilfield Company Renqiu Hebei Province 062552

Tight oil, a kind of unconventional oil accumulation that accumulates in source rocks in a free or adsorbed status in low or ultra-low porous sandstones or carbonates rocks which are interbedded with or adjacent to so...

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Reservoirs properties of slump-type sub-lacustrine fans and their main control factors in first member of Paleogene Shahejie Formation in Binhai area, Bohai Bay Basin, China

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Petroleum Exploration and Development 2020年第5期47卷 977-989页

作者： PU Xiugang zhao xianzheng WANG Jiahao WU Jiapeng HAN Wenzhong WANG Hua SHI Zhannan JIANG Wenya ZHANG Wei Dagang Oilfield Company PetroChinaTianjin 300280China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China

High-yielding oil wells were recently found in the first member of Paleogene Shahejie Formation,the Binhai area of Qikou Sag,providing an example of medium-and deep-buried high-quality reservoirs in the central part of a faulted lacustrine *** using data of cores,cast thin sections,scanning electron microscope and physical property tests,the sedimentary facies,physical properties and main control factors of the high-quality reservoirs were *** reservoirs are identified as deposits of slump-type sub-lacustrine fans,which are marked by muddy fragments,slump deformation structure and Bouma sequences in *** present mostly medium porosity and low permeability,and slightly medium porosity and high *** have primary intergranular pores,intergranular and intragranular dissolution pores in feldspar and detritus grains,and structural microcracks as storage *** main factors controlling the high quality reservoirs are as follows:(1)Favorable sedimentary microfacies of main and proximal distributary gravity flow *** microfacies with coarse sediment were dominated by transportation and deposition of sandy debris flow,and the effect of deposition on reservoir properties decreases with the increase of depth.(2)Medium texture *** is shown by medium-sorted sandstones that were formed by beach bar sediment collapsing and redepositing,and was good for the formation of the primary intergranular pores.(3)High content of intermediate-acid volcanic rock *** reservoir sandstone has high content of detritus of various components,especially intermediate-acid volcanic rock detritus,which is good for the formation of dissolution pores.(4)Organic acid *** was attributed to hydrocarbon maturity during mesodiagenetic A substage.(5)Early-forming and long lasting overpressure.A large-scale overpressure compartment was caused by under-compaction and hydrocarbon generation pressurization related to thick deep-lacustrine mu

关键词： faulted lacustrine basin slump-type sub-lacustrine fan reservoir Paleogene Shahejie Formation porosity-permeability structure Qikou Sag Bohai Bay Basin

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