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Research Advances and Exploration Significance of Large-area Accumulation of Low and Medium Abundance Lithologic Reservoirs

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Acta Geologica Sinica(English Edition) 2008年第3期82卷 463-476页

作者： ZHAO Wenzhi wang zecheng wang Hongjun CHEN Mengjin Research Institute of Petroleum Exploration and Development Beijing 100083 China

In recent years, a series of large low and medium abundance oil and gas fields are discovered through exploration activities onshore China, which are commonly characterized by low porosity-permeability reservoirs, low oil/gas column height, multiple thin hydrocarbon layers, and distribution in overlapping and connection, and so on. The advantageous conditions for large-area accumulation of low-medium abundance hydrocarbon reservoirs include：（1） large （fan） delta sandbodies are developed in the hinterland of large flow-uncontrolled lake basins and they are alternated with source rocks extensively in a structure like ＂sandwiches＂; （2） effective hydrocarbon source kitchens are extensively distributed, offering maximum contact chances with various sandbodies and hydrocarbon source rocks; （3） oil and gas columns are low in height, hydrocarbon layers are mainly of normal-low pressure, and requirements for seal rock are low; （4） reservoirs have strong inheterogeneity and gas reservoirs are badly connected; （5） the hydrocarbon desorption and expulsion under uplifting and unloading environments cause widely distributed hydrocarbon source rocks of coal measures to form large-area reservoirs; （6） deep basin areas and synclinal areas possess reservoir-forming dynamics. The areas with great exploration potential include the Paleozoic and Mesozoic in the Ordos Basin, the Xujiahe Formation in Dachuanzhong in the Sichuan basin, deep basin areas in the Songliao basin etc. The core techniques of improving exploration efficiency consist of the sweetspot prediction technique that focuses on fine characterization of reservoirs, the hydrocarbon layer protecting and high-speed drilling technique, and the rework technique for enhancing productivity.

关键词： reserve abundance lithologic hydrocarbon reservoir hydrocarbon-rich sag sweet spot exploration technique

Analysis on forming conditions of deep marine reservoirs and their concentration belts in superimposed basins in China

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Chinese Science Bulletin 2007年第A01期52卷 12-27页

作者： ZHAO WenZhi wang zecheng ZHANG ShuiChang wang HongJun Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China

By taking the Tarim Basin, Sichuan Basin and Ordos Basin as examples, the conditions for deep marine reservoir formation were illustrated in three aspects listed below: late-stage superimposition style, burial history and structural deformation of the marine stratigraphic system. The burial history of marine source rocks can be divided into three types, i.e., type I, type II and type III, which are obviously different from the case with present hydrocarbon phases in terms of hydrocarbon generation and petroleum-reservoir formation. Based on evolution history, the structural belts in the marine stratigraphic sequence can also be divided into four types, i.e. earlier normal fault-later fault-fold type, earlier uplift-later fault-fold type, earlier uplift-later flattened slope type, and earlier depression-later thrust type. In this paper, a successive gas generation model was proposed, and it was particularly pointed out that coupling of geothermal field annealing evolution and tectonic subsidence and late gas generation from dispersed liquid hydrocarbon in highly matured to over-matured source rocks are key factors for formation of marine petroleum reservoirs. The geological conditions for formation of high-grade reservoirs in deep marine system, covering early hydrocarbon injection, deep denudation and buried dolomitization, were summarized. It was finally concluded that three major structural belts, i.e. paleo-uplift belt characterized by composite hydrocarbon accumulation, paleo-fault belt and high-energy sedimentary facies belt, were involved in marine hydrocarbon accumulation.

关键词：叠加盆地海洋形成碳酸氢盐深海地带

Formation Mechanism of the High-quality Upper Paleozoic Natural Gas Reservoirs in the Ordos Basin

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Acta Geologica Sinica(English Edition) 2005年第6期79卷 843-855页

作者： ZHAO Wenzhi wang zecheng CHEN Menjin ZHENG Hongju Research Institute of Petroleum Exploration and Development Petrochina Beijing 100083

The upper Paleozoic natural gas reservoirs in the Ordos basin are generally characterized by a large gas-bearing area and low reserve abundance. On such a geological background, there still exist gas-enriched zones, with relatively high outputs, high reserve abundance and stably distributed gas layers. The gas-enriched layers with relatively high permeability （the lower limit permeability is 0.5×10^-3μm^2） are key factors for the enrichment and high output of natural gas. Based on core observation, analytic results of inclusions, and a great deal of drilling data, we proposed the following four mechanisms for the formation of high-quality reservoirs：（1） in the source area the parent rocks are mainly metamorphic rocks and granites, which are favorable to keeping primary porosity; （2） under the condition of low A/S （accommodation/sediment supply） ratios, sandstone complex formed due to multistage fluvial stacking and filling are coarse in grain size with a high degree of sorting, low content of mud and good physical properties; （3） early-stage recharge of hydrocarbons restricted compaction and cementation, and thus are favorable to preservation of primary pores; （4） microfractures caused by the activity of basement faults during the Yanshan Movement stage can not only improve the permeability of tight sandstones, but also afford vertical pathways for hydrocarbon gas migration.

关键词： lithology of parent rock A/S ratio recharge of hydrocarbons microfractures multistage fluvial complex upper Paleozoic Ordos Basin

Control of coupling among three major factors for formation of high-efficiency gas reservoir——A case study on the oolitic beach gas reservoir in Feixianguan Formation in the northeast Sichuan Basin

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Chinese Science Bulletin 2007年第A01期52卷 201-214页

作者： wang zecheng ZHAO WenZhi ZHANG ShuiChang wang HongJun YU Qian Institute of Geology Research Institute of Petroleum Exploration and Development Beijing 100083 China Research Institute of Petroleum Exploration and Development Beijing 100083 China Testing Center of Petroleum Geology Research Institute of Petroleum Exploration and Development Beijing 100083 China Chengdu Institute of Geology and Mineral Resources Chengdu 610082 China

Through a case study of the high-efficiency gas reservoir in Feixianguan Formation in the northeast Sichuan Basin, quantitative and semi-quantitative analyses of key elements such as hydrocarbon generation, migration and accumulation, and reservoir evolution as well as their interplay in the critical moment of reservoir formation controlled by the energy field were carried out, by means of numerical modeling of the energy field. It was found that the climax time for Permian hydrocarbon generation was Late Triassic-Early Jurassic and accumulation of oil and gas has resulted in large-scale paleoreservoirs in paleostructural traps in Feixianguan Formation, a process facilitated by fractures connecting the sources. The paleoreservoirs have been turned into high-efficiency gas kitchens due to pyrolysis, which resulted from deep burial at a temperature of 170―210 ℃ as induced by tremendously thick sedimentation in the foreland basin of Daba Mountain in Late Jurassic-Cretaceous period. Meanwhile, abundant acid gas like H2S produced from thermo-chemical sulfate reduction (TSR) at high temperatures leads to extensive dissolution of dolostone in the paleoreservoirs, which may in turn result in modification of the reservoirs and preservation of the reservoir rock porosity. The present distribution of gas reservoirs was ultimately determined in the processes of adjustment, cooling and decompression of the paleoreservoirs resulting from intense deformation in the front of Daba Mountain during the Himalayan orogeny.

关键词：数字模型高效率储存四川盆地资源开发

Characteristics of Changchengian rifts in southern margin of North China Craton and its hydrocarbon geological conditions

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Petroleum Research 2018年第3期3卷 269-282页

作者： Kun wang Tongshan wang zecheng wang Ping Luo Qiufen Li Jie Fang Kui Ma PetroChina Research Institute of Petroleum Exploration and Development Beijing100083China

The Meso-Neoproterozoic strata are wildly distributed in North China Craton(NCC),of which Changchengian strata are most widely *** Changchengian strata in south margin of NCC as the study object,and combined with comprehensive analysis of isotopic chronology and petrology,it can be concluded that the Xiong'er rift is a plume rift which responds to breakup of Columbia *** data shows that Changchengian rifts are developed in the Qinshui Basin and the southern part of Ordos Basin covered by Phanerozoic strata,respectively are large-scale graben rifts and half-graben *** magnetic data indicates that a NE-trending rift is developed in the west of the Xiong'er rift,and the Qinshui Basin rift is the extension of the north branch of the Xiong'er *** filling process of Changchengian rifts can be divided into four stages:the early rifting stage developing thick andesitic volcanic rocks,the late rifting stage developing large suite of coarse clastic sedimentary rocks,the depression stage developing fine clastic rocks,and the epeiric sea stage developing carbonate *** dark argillaceous rocks are developed in Cuizhuang Formation and Chenjiajian Formation during the depression stage,and the black shale in Cuizhuang Formation is the effective source *** bitume is filled in fractures of dolomite in Luoyukou Formation,as well as dissolution pores and large caves in Longjiayuan *** argillaceous sandstone and muddy limestone of Lower Cambrian is the effective cap rocks,which can form an potential accumulation assemblage of Changchengian strata with underlying source rocks of Cuizhuang Formation and reservoirs of Luoyu Group,and this assemblage may be still effective at present.

关键词： Changchengian Xiong'er rift Ordos Basin Qinshui Basin Filling sequence Hydrocarbon geological conditions Accumulation assemblage

Switching from advancing to retreating subduction in the Neoproterozoic Tarim Craton, NW China: Implications for Rodinia breakup

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Geoscience Frontiers 2021年第1期12卷 161-171页

作者： Guanghui Wu Shuai Yang Wei Liu R.Damian Nance Xin Chen zecheng wang Yang Xiao School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Southwest Petroleum University Division of Key Laboratory of Carbonate ReservoirsCNPCChengdu 610500China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Department of Geological Sciences 316 Clippinger LaboratoriesOhio UniversityAthensOH 45701USA

Geodynamic drivers for the supercontinent cycle are generally attributed to either top-down(subduction-related)or bottom-up(mantle-related)*** geochemical data and U-Pb ages and Hf isotopic signatures for magmatic and detrital zircons from the Tarim Craton reveal a distinct change in subduction style during the *** subduction cycle is recorded in increasing and decreasing intensity of subduction-related magmatic rocks and time-equivalent sedimentary successions,and converse trends ofεHf(t)values and corresponding changes in crustal incubation *** trends are consistent with a switch from advancing to retreating *** switch likely occurred at ca.760 Ma when zirconεHf(t)values increase and crustal incubation times decrease following a transitional shift between 800 Ma and 760 Ma.A switch at this time is consistent with Rodinia breakup and may have resulted in the late Neoproterozoic Tarim rift *** long-lived(ca.500 Ma)subduction recorded in the Tarim Craton suggests the predominance of a top-down process for Rodinia breakup on this part of its margin.

关键词： Supercontinent breakup Top-down tectonics Rodinia Subduction U-Pb-Hf isotopes

Research on the Association of Mobile Social Network Users Privacy Information Based on Big Data Analysis

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Journal of Information Hiding and Privacy Protection 2019年第1期1卷 35-42页

作者： Pingshui wang zecheng wang Qinjuan Ma School of Management Science and Engineering Anhui University of Finance&EconomicsBengbu233030China School of Business Administration Anhui University of Finance&EconomicsBengbu233030China

The issue of privacy protection for mobile social networks is a frontier topic in the field of social network *** existing researches on user privacy protection in mobile social network mainly focus on privacy preserving data publishing and access *** is little research on the association of user privacy information,so it is not easy to design personalized privacy protection strategy,but also increase the complexity of user privacy ***,this paper concentrates on the association of user privacy information taking big data analysis tools,so as to provide data support for personalized privacy protection strategy design.

关键词： Big data analysis mobile social network privacy protection association.

Research on Privacy Preserving Data Mining

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Journal of Information Hiding and Privacy Protection 2019年第2期1卷 61-68页

作者： Pingshui wang Tao Chen zecheng wang Anhui University of Finance and Economics Bengbu233030China University of Kansas LawrenceKansas66045USA

In recent years,with the explosive development in Internet,data storage and data processing technologies,privacy preservation has been one of the greater concerns in data mining.A number of methods and techniques have been developed for privacy preserving data *** paper provided a wide survey of different privacy preserving data mining algorithms and analyzed the representative techniques for privacy *** existing problems and directions for future research are also discussed.

关键词： Privacy preserving data mining randomization anonymization secure multiparty computation

Comparative study of gas accumulations in the Permian Changxing reefs and Triassic Feixianguan oolitic reservoirs between Longgang and Luojiazhai-Puguang in the Sichuan Basin

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Chinese Science Bulletin 2011年第28期56卷 3310-3320页

作者： ZHAO WenZhi XU ChunChun wang TongShan wang HongJun wang zecheng BIAN CongSheng LI Xia PetroChina Exploration ＆ Production Company Beijing 100007 China PetroChina Southwest Oil ＆ Gas Field Company Chengdu 610051 China PetroChina Research Institute of Petroleum Exploration ＆ Development Beijing 100083 China

Reef and oolitic gas reservoirs in the Permian Changxing and Triassic Feixianguan formations have been discovered in both the Luojiazhai-Puguang and Longgang areas of the Sichuan Basin, but the accumulation scale, abundance and distribution patterns differ greatly. In fact, the two areas have more differences than they have similarities. Similarities include: (1) the lithology, properties and types of porosity of the reef and oolitic reservoirs are primarily consistent in the two areas; (2) well-developed regional caprocks that seal the fluid system; and (3) accumulation process histories, with liquid hydrocarbon charging at an early stage, cracking into gas at a high to over-mature stage, adjustment of gas reservoirs at an uplifting stage, and final reservoir generation at a late stage. Differences include: (1) gas accumulations in the Luojiazhai-Puguang area that are dominated by oil-type cracked gas, with multiple and sufficient gas sources, contrasting with gas accumulations in the Longgang area that are dominated by coal-sourced gas with insufficient gas sources; (2) heterogeneity and horizontal diversity of reservoirs in the Longgang area that are stronger than in the Luojiazhai-Puguang area; and (3) the development of deep and large faults in the Luojiazhai-Puguang area that link source, reservoir and migration pathways, contrasting with poorly developed faults in Longgang area, where laterally variable fractures are the major migration pathway. Because of these differences, abundant large-scale structurally-controlled gas accumulations are developed in the Luojiazhai-Puguang area, whereas lithology plays a more important role in gas accumulation in the Longgang area where accumulations are smaller-scale and have lower gas-bearing abundance. We suggest that future exploration for reef and oolitic gas accumulations should be strengthened in NE Sichuan and NW Sichuan Jiulongshan. In particular, the transitional zone between Longgang and Kaijiang-Liangping Bay h

关键词：四川盆地东北部飞仙关组鲕滩鲕滩气藏三叠系珊瑚礁水库地龙二叠世

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