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01 January 2019, Volume 35 Issue 4 Previous Issue    Next Issue

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Analysis of Petroleum Resource Potentials in Carboniferous-Permian Dense Rocks of China KANG Yuzhu1, CHEN Xinhua2 2014, 35 (4):  1-1.  Abstract ( 181 )   PDF (300KB) ( 332 )   Save Since the discovery of a large gas field in Jingbian Carboniferous tight sandstone of Ordos basin in 1989, China ’s tight rocks exploration for petroleum has a history for more than 20years. In recent years, many tight sandstone oil and gas fields have been found in Silurian, Carboniferous ? Permian, Triassic and Cretaceous in Ordos, Sichuan, Junggar and Tarim basins, further proving that China’s petroleum potentials in tight rocks are great. The study suggests that, of the so many strata, the Carboniferous? Permian tight rocks oil? gas exploration prospects are the largest. Also, this paper presents and discusses the oil ? gas prospects and targets from the prototype basins’sedimentary systems and petroleum systems Related Articles | Metrics

Basic Characteristics of Hydrocarbon Fluid Inclusion Events and Analysis of Forming Reservoirs in Qiangtang Basin SONG Chunyan, WANG Jian, HE Li, FU Xiugen, TAN Fuwen, CAO Junfeng Basic Characteristics of Hydrocarbon Fluid Inclusion Events and Analysis of Forming Reservoirs in Qiangtang Basin SONG Chunyan, WANG Jian, HE Li, FU Xiugen, TAN Fuwen, CAO Junfeng 2014, 35 (4):  1-1.  Abstract ( 49 )   PDF (300KB) ( 310 )   Save This paper studies the lithofacies, temperature and composition of the fluid inclusions from multiple sets of strata in Qiangtang basin. The lithofacies feature shows that there exist many types of fluid inclusions with gas?liquid phases, of which gas phase is dominated by CH4, and some other compositions are H2S, H2, CO2 and N2. The temperature range of the fluid inclusions in this basin is wide: the freezing point temperature ranges from -2.0℃ to 14.2℃, the homogenization temperature is from 0℃ to 367℃. It is suggested that six main fluid events exist at least in Qiangtang basin, they are: 0~22℃, 76~85℃, 122~128℃, 172~189℃, 220~255℃, and 220~370℃, of which the first period was after the late tectonic uplift, so the inclusions do not contain hydrocarbons, nothing to do with the oil?gas migration and accumulation; the others (five?period inclusions) do have contained hydrocarbons, and should be related to the oil and gas migration and accumulation in Qiangtang basin Related Articles | Metrics

Hydrocarbon Accumulation Elements Analysis of Tiaohu Tuff Reservoir of Middle Permian, Santanghu Basin CHEN Xuana, LI Jiea, LIANG Haoa, LUO Quanshenga, FAN Tanguanga, HE Renzhongb, FENG Yaqina 2014, 35 (4):  1-1.  Abstract ( 67 )   PDF (300KB) ( 246 )   Save A set of tight sedimentary tuff reservoirs were found in Tiaohu formation of the Middle Permian in Santanghu basin, which formed a tight hydrocarbon accumulation play integrated with source and reservoir rocks. This paper presents the formation mechanism of the tight sedimentary tuff reservoir from sedimentary structural setting and source?reservoir formation feature, and analyzes the controlling factors of such a reservoir of Tiaohu formation in Mazhong area in Malang sag. The reservoir shows that distributions of the Tiaohu sedimentary tuff reservoir and high?quality source rocks are controlled by paleo?lake basin formed during the volcanic eruptions intermittent period;the compact superimposition of the organic matter?rich shale and the underlying high porosity?extra low permeability sedimentary tuff provide good conditions for petroleum charging into the tight reservoir; the wide flat slope in the paleo?lake basin and its hinterland are the favorable positions for high?quality source rocks and good reservoir development; the Niujuanhu south slope, Mazhong area and Shibandun area in Malang sag and Tiaohu sag are the favorable domain for Tiaohu tight reservoirs exploration in Santanghu basin Related Articles | Metrics

Study on the Fracture Systems of Epimetamorphic Rock Buried Hill Reservoir in Sudeerte Oilfield, Beier Sag in Hailar Basin SU Xiangguang1a, SUN Mengmeng1b, ZHANG Dinan1a, JIA Aiting2 2014, 35 (4):  1-1.  Abstract ( 81 )   PDF (300KB) ( 219 )   Save This paper presents in?depth research of the fracture?controlled factors, reservoir types and fracture systems of the epimetamorphic rock buried hill reservoir of Budate group in Sudeerte Oilfield in Hailar basin. The results show that the formation of the buried hill reservoir fractures is related to the tectonic movements here, with multistage shaping and filling features. The reservoir types mainly include the pore?fracturevug type and the pore?fracture type. The fault activity differences lead to different development of fractures in different fault blocks: near the intense faults, the reservoir rock developes best, with good petrophysical properties; while away from the faults,the reservoir rock less developes, and the petrophysical property is poor. For the fault blocks with poor developing fractures in the buried hill reservoirs, there exist top and inside fracture network systems in the vertical, which have big differences in reservoir type, petrophysical property and oil productivity, etc Related Articles | Metrics

Fractures Characteristics in Tight Reservoir of the 3rd Member of Xujiahe Formation in Yuanba Area in Northeastern Sichuan Basin ZHANG Chong1a, XIE Runcheng1a,1b, ZHOU Wen1a,1b, LI Yu2, WANG Hao1a, WANG Yu1a, LI Jingrong2 2014, 35 (4):  1-1.  Abstract ( 52 )   PDF (300KB) ( 197 )   Save The reservoir of the 3rd member of Xujiahe formation in Yuanba area is tight sandstone reservoir with low porosity and low permeability. Based on the core，logging and geological data, the features of fracture development on the core and the response of fractures on the conventional well logging are studied, and the regional geological structure setting is used to research the control factors of fractures, by which the fracture development of the 3rd member is evaluated comprehensively. The study shows that the type of fracture origin belongs to structural fracture dominated by low?angle or horizontal tension fracture, with high effectiveness of it. The fractures are mainly manifested as high interval transit time and low dual laterolog resistivity by conventional well logs, and relatively large width and porosity by log interpretation. Combined with the regional geologic data, the core observation and the fracture logging identification results, the fracture development is affected synthetically by layer thickness, fault, lithology and structural deformation intensity. Finally, according to the factors controlling fracture development, by using precision grid to evaluate the fracture in the Yuanba area, the results are in good accordance with the conventional single well identification result at the rate of 87.9%, and also good with the production test result Related Articles | Metrics

New Advances of Seismic Prospecting Technology for Mesozoic in Northern South China Sea YI Hai, WEI Chenglong, SHU Hu, SHUAI Qingwei 2014, 35 (4):  1-1.  Abstract ( 58 )   PDF (300KB) ( 43 )   Save The Mesozoic in northern South China Sea is characterized by low frequency (mainly in 8~35 Hz) and weak energy in seismic reflectance, so it is difficult to get high signal?to?noise ratio seismic data by using conventional seismic acquisition technology. This paper redesigned a new low?frequency source of 6 400 in3 for improving the energy in low?frequency end, and put the cable sinking depth increased to 18 m for reducing ambient noises the cable received. The comparison results from marine seismic source test showed that by using the combination of such a new low?frequency source and deep sinking cable acquisition, the Mesozoic reflectance obtained is of much higher signal?to?noise ratio than before. Also, this paper presents the main parameters for test and indicates the advantages of this combination in aspects of final migration profile, velocity spectrum and amplitude spectrum Related Articles | Metrics

Numerical Simulation Analysis of the Seismic LowFrequency Shadows LAN Feng, LI Ming, LI Yandong, TIAN Han Numerical Simulation Analysis of the Seismic LowFrequency Shadows LAN Feng, LI Ming, LI Yandong, TIAN Han 2014, 35 (4):  1-1.  Abstract ( 56 )   PDF (300KB) ( 230 )   Save The mechanism of the low?frequency shadows is explained from seismic wave attenuation with instantaneous spectral analysis method and two equivalent formation models are developed in this paper. The horizontal layered medium model analysis shows that in the instantaneous frequency spectrum profiles for the low frequency (such as 15 Hz), the strong energy group occurs beneath the oil?gas bearing layer; when the frequency is above 50 Hz, the energy below the reservoir is much weaker than the energy of the corresponding position of it, which is a typical phenomenon of low?frequency shadows. The simplified caved carbonate reservoir model analysis result indicates that when hydrocarbon is contained in the karst caves, the obvious low?frequency shadows phenomenon may appear near the interface with the wave impedance difference at first beneath the caves, while water is contained in the caves, such a phenomenon is less clear. It is proved that this conclusion is relevant to the real seismic interpretation results, and can be as theoretical basis for identification of oil and water bearing layers by means of the low?frequency shadows Related Articles | Metrics

Identification of the Unconformity Trap Boundaries in Chunhui Oilfield in Northern Margin of Junggar Basin ZHOU Jian 2014, 35 (4):  1-1.  Abstract ( 47 )   PDF (300KB) ( 239 )   Save The overlap?erosion oil reservoir is the main type in shallow overlap?erosion belt of Chunhui oilfield in Junggar basin. Accurate determination of the stratigraphic overlap?erosion line is of great significance for guiding oil?gas exploration here. It is indicated by forward modeling that there exists an extrapolating distance between the seismic overlap?erosion line and the real line constrained by seismic vertical resolution, and the distance decreases with stratigraphic inclination angle increasing, increases with stratum velocity increasing and decreases with seismic frequency increasing. Therefore, this paper establishes the extrapolating equations suitable for the studied area and determines accurately the positions of the overlap?erosion line Related Articles | Metrics

The Formation Water Characteristics and Their Relationship with Hydrocarbon in Hongshanzui-Chepaizi Fault Belt and Its Surrounding AreasJunggar Basin XU Zhengjian, LIU Luofu, WU Kangjun, XIAO Fei, ZHOU Changxiao 2014, 35 (4):  1-1.  Abstract ( 63 )   PDF (300KB) ( 195 )   Save Based on the related parameters of formation water, combined with the spatial distribution of hydrocarbon reservoirs, this paper discussed the relationship between the chemical characteristics of formation water and the hydrocarbon accumulation and preservation in Hongshanzui?Chepaizi fault belt and its surrounding areas. In profile，the formation water types in Neogene Shawan formation and Lower Jurassic Badaowan formation are dominated by CaCl2, while in Lower Cretaceous Qingshuihe formation, Upper Jurassic Qigu formation andLower Jurassic Sangonghe formation they are dominated by NaHCO3. The total dissolved solid(TDS) or salinity of formation water in Shawan formation is the highest, the TDS in Qingshuihe formation is lower, and the TDS in Sangonghe formation is the lowest. For the Sodium?Chlorine coefficient, carbonate equilibrium coefficient and de?sulfuric acid coefficient, Sangonghe formation is the highest, and Qigu formation and Qingshuihe formation are lower. For the Calcium?Magnesium coefficient and Metamorphic coefficient, Shawan formation is the highest, Qingshuihe formation and Badaowan formation are lower. The comprehensive analyses show that the sealing property of Badaowan formation is the best, and those of Shawan formation and Qingshuihe formation are better, and those of Qigu formation and Sangonghe formation are poor. On the Plane, the sealing property of middle part of the study area in Qingshuihe formation is the best, while those of the north part of it in Qigu formation and the south part of it in Badaowan formation are the best. The sealing property of formation indicated by the chemical characteristics of formation water is consistent with the spatial distribution characteristics of hydrocarbon reservoirs, having important guiding significance on the hydrocarbon exploration in these areas Related Articles | Metrics

The OilWell ReExamination and the OilWater Contact Analysis of Ordovician Reservoir in Yingmai2 Structure in Tarim Basin FAN Hongwei1, LUO Risheng2 2014, 35 (4):  1-1.  Abstract ( 64 )   PDF (300KB) ( 283 )   Save The Ordovician carbonate reservoir in Yingmai?2 structure of Tarim basin is an efficient development block with constructed productivity of 20×104 t, but it is still uncertain for its oil?water contact and reservoir type by far, which restricts the reasonable exploitation of the reservoir. This paper presents re?examination of the data from 12 oil wells with vertical depth over 6 100 m and suggests that Yingmai?2 reservoir is a block and bottom water reservoir controlled by structure and reservoir rocks, with relatively unified oil?water contact located at about ?5 110 m ASL. It is concluded that in the Ordovician in Tabei area there exist two types of reservoirs, one is quasi?layered reservoir which could be found in areas with stratigraphic dip angle of less than 2.0°, the other is block and bottom water reservoir with larger dip angles (6.2° in average) and background of traps, and the hydrocarbons in them are easier to migrate and accumulate along vertical direction Related Articles | Metrics

The Influence of Wellbore Fluid Changes on Pressure Buildup Data and the Processing of Data Restoration ZHANG Jiafu 2014, 35 (4):  1-1.  Abstract ( 62 )   PDF (300KB) ( 276 )   Save A well produced with oil and water may form oil?water and oil?gas contacts during test of shut in pressure recovery due to early oil, gas and water differentiation in the wellbore, and the contacts will appear in continually rising. For the saturated reservoir, they will appear in gradually moving down in late shut?in period. When the test pressure gauge is situated far away from the midpoint of pay zone, the pressure recovery rate of measured point tends to being less than that of the midpoint of pay zone in the process of these contacts moving up to and over the pressure gauge; while during the contacts moving down to and below the gauge position, it is generally greater than that of the actual reservoir. In the period of time of measuring point pressure and formation pressure recovery occurring in out?of?step, the measured pressure will be abnormal. Such an abnormal fluctuation may impact the accuracy of pressure data and increase the difficulty of data processing. And the serious impact can not allow the pressure data to be used. Hence, the pressure data restoration is necessary, in order to remove them and improve the quality and interpretation accuracy of test data, making the useless information become useful data Related Articles | Metrics

Impact of Equations of State on Methane Adsorption Isotherms of Shales HE Bin, Ning Zhengfu,YANG Feng, KONG Detao, PENG Pan 2014, 35 (4):  1-1.  Abstract ( 57 )   PDF (300KB) ( 385 )   Save This paper presents the comparisons of methane compressibility factors from universal three equations of state (EOS) and one empirical EOS. By the four EOSs the shale’s adsorption methane isotherms are calculated, respectively, and then the comparative analysis with the result given by the NIST standard reference database is conducted. The results show that adsorption isotherms calculated by different EOSs have significant differences and the EOS has less effect on the adsorption at equilibrium pressure less than 4 MPa, and the effect will quickly increase after mid?high pressure. Especially when the pressure is higher than 13 MPa, the shape of the isotherms will greatly change.It is mainly caused by gradually larger adsorption from different EOSs after the mid?high pressure, while at low pressure this effect is not big Related Articles | Metrics

Numerical Simulation Research of Fracture Propagation in Tight Sand Reservoir by Volume Fracturing Process ZHAO Zhenfeng1, WANG Wenxiong1, ZOU Yushi2, LEI Xin2, XIAO Bo2 2014, 35 (4):  1-1.  Abstract ( 72 )   PDF (300KB) ( 527 )   Save Volume fracturing is the key technology for improving production of tight sand oil reservoir. By the approach of integrating finite element method with discrete element method, a model for fracture propagation by volume fracturing process is developed in this paper, by which the fracture propagation modeling of multiple clusters fracturing of horizontal well in Chang?7 tight sand oil reservoir of Changqing oilfield is researched. The result shows that volume fracture could easily form when stress difference is lower than 4 MPa, and planar fracture mainly formed when it is higher than 5 MPa. The density of natural fracture could only affect the stimulation effect when the stress difference is very low. When the stress difference is 3 MPa, the interference of fracture between clusters is serious and partial merge of fractures will appear. In this situation, no matter increasing number of perforation cluster or reducing cluster space, the stimulating reservoir area won’t increase obviously. When the stress difference is 5 MPa, the interference of fracture between clusters is weak. Increasing number of perforation cluster is beneficial for hydraulic fractures to connect with more natural fractures, improving the development degree of the volume fractures and expanding the stimulation area. Related Articles | Metrics

HighFrequency Sequence Unit Interpretation Method Based on Seismic SedimentologyAn example from DistrictA in Yinggehai basin CHEN Zhihong1,2, YING Mingxiong2, CHEN Dianyuan2 2014, 35 (4):  1-1.  Abstract ( 54 )   PDF (300KB) ( 183 )   Save The traditional high?frequency sequence analysis as the most commonly used approach focuses on the interpretation and correlation of seismic markers constrained by well logging data, but it could not be applied in the area with few well data and low?resolution seismic profiles. In this paper, a new approach on high?frequence sequence analysis based on seismic sedimentology is presented, and a new seismic?sedimentological approach for mapping high?frequency sequence by a case study is introduced. First, we used seismic sedimentology to investigate high?resolution horizontal (plan view) depositional elements is the third?order sequence stratigraphic framework; then, we examined their high?frequency sequence?stratigraphic context in vertical and 3?D view. The new approach included three steps: 1)converting a 3?D seismic volume into a lithology volume; 2)defining the high?frequency sequence boundaries by using seismic geomorphology; 3)adjusting the high?frequency sequence stratigraphic studies under the control of frequency decomposing profile. The new interpretation procedure shifts the emphasis of high?frequence sequence stratigraphic studies from interpreting vertical seismic profiles to analyzing more horizontal, high ?resolution and seismic ? geomorphologic information, which allows the tracing of high ?frequence sequence stratigraphic boundaries and the 3?D imaging to be realized more quickly and accurately Related Articles | Metrics

Application of Deep Profile Control Technology in Lunnan Oilfield, Tarim Basin ZHOU Daiyu1, ZHAO Ji1, WANG Jin2, LUO Qiang2, XIAO Chunyan1, YUAN Fenggang2, ZHAO Hong1 2014, 35 (4):  1-1.  Abstract ( 61 )   PDF (300KB) ( 225 )   Save The role of deep profile control is to improve the reservoir heterogeneity and enhance the efficiency of waterflooding. Several agents performances were evaluated, and 4?well group pilot test was conducted for deep profile control in eastern TI oil layer in Wellblock?2 of Lunnan oilfield in Tarim basin. The laboratory studies show that the microsphere and particle are of better performances of high temperature and salt resistance, and the high temperature?resisting polymer is of good water shutoff performance. The field pilot test shows that with increase of the 4?well group water injection pressure, the average apparent injectivity index may decrease by 12.5%. By the end of Feb.2014, the cumulative incremental oil of the test area reached 1.23×104 t, the incremental oil for slowdown decline was 2.22×104 t, and the water cut decreased by 3.2%. The obvious effects indicate that the successful application of the deep profile control technology to the pilot test area is of implication for development of the whole TI reservoir and other ones with high temperature and high salinity Related Articles | Metrics

Application of Pseudo Sonic Log Recomposition Technique Based on Multiple Well Logs YIN Jiyao1, WANG Xiaojun1, YANG Rongrong1, XIE Zongrui1, LIU Zuoqiang2 2014, 35 (4):  1-1.  Abstract ( 66 )   PDF (300KB) ( 272 )   Save In this paper, the advantages and disadvantages of predecessors’methods are discussed, and the pseudo sonic log recomposition technique based on multiple well logs is proposed to be used for logging?constrained inversion for the purpose of reservoir prediction. The technique is based on two principles in the recomposition: one is the low?frequency changing trend of interval transit time should accord with the formation compaction regulation; the other is its high?frequency part should enable to well distinguish related lithology. The recomposition include wavelet transform spectrum decomposition, multiple regression, dimension conversion, arithmetical operation, etc. The practical log data processing shows that the recomposition well logs can not only remain the original geologic characteristics, but also obviously improve the sand resolution, it can highlight the difference from the surrounding rocks, hence provide solid support in sonic log datafor wave impedance inversion Related Articles | Metrics

Interwell Potential Method for Monitoring Fire Flooding Front: Technological Study and Application WANG Ruyan, PAN Jingjun, CHEN Long, CHEN Lijuan, CAI Gang, YU Jie, SONG Xiao 2014, 35 (4):  1-1.  Abstract ( 66 )   PDF (300KB) ( 245 )   Save This paper presents the principle of interwell testing by electric potential for monitoring fire flooding front and the ground potential difference model, analyzes the impact of reservoir physical property and electrical changes in each zone on the formation resistivity during in?situ combustion process, and establishes the fire flooding front resistivity interpretation model by interwell potential method (IPM),by which the resistivity changes in objective layer is determined using the ground potential data, with the position of fire flooding front in the case study area. It is indicated from the downhole temperature and production performance analyses that the IPM can be used to detect in?situ combustion flooding front, advancing direction and velocity, as well as fire flooding sweep efficiency, and provide technical support for control of the production performance in heavy oil reservoirs Related Articles | Metrics

Application of Industrial Computed Tomography (ICT) to Research of Fractured Tight Sandstone Gas Reservoirs CHANG Lunjie1, ZHAO Libin1, YANG Xuejun1, BAI Xiaojia1, ZHENG Xin2 2014, 35 (4):  1-1.  Abstract ( 78 )   PDF (300KB) ( 268 )   Save The Lower Cretaceous Bashijiqike reservoirs in a gasfield of Kuqa depression in Tarim basin belong to a typical low?permeability and fractured tight sandstone reservoir. Their fractures have complex origin and evolution history due to a multistage tectonic movements experience, large burial depth and many interbeds. The fractures in them not only play an important role in oil and gas migration as the main effective pathway, but also a significant impact factor on the reservoir stimulation by hydraulic fracturing. The main methods (including medical CT) for fractures description or characterization have disadvantages of low identification precision and poor quantitative assessment effect. In this paper, ICT (Industrial Computed Tomography) technique is used to scan and image the inner fractures in core samples from the fractured tight sandstone reservoirs in this gasfield, based on which the systematically study is carried out on the shape, occurrence, filling feature, spatial combination and origin classification of the fractures. The result shows that the fractures occurred in this study area are dominated by high?angle tectonic fractures, including extension one, shear one and multistage mixed one given by mechanism analysis. The type of fractures can be divided into linear, broken line, complicated network, wheat?like and broom?like ones. And the lots of fractures have complex “multilayer filling structure”that is discovered for the first time. The porosity of fractures in these reservoirs by the ICT analysis mainly ranges from 0.01% to 0.04% Related Articles | Metrics

Application of Quantitative Characterization Technology for Tight Reservoirs in Sulige Gas Field LI Wenjie1, LI Huifeng1, ZHANG Chao2, LI Jinfu2, LI Xu2 2014, 35 (4):  1-1.  Abstract ( 47 )   PDF (300KB) ( 204 )   Save Sulige gas field in Ordos basin is characterized by the thin sand body and the little difference of wave impedance between effective reservoir and surrounding rock, which lead to difficult fine description of the reservoirs by conventional inversion approach. In order to improve the successful prediction rate of tight sand gas reservoir“dessert”for guiding the horizontal well designing, this paper takes a block in Sulige gas field as the target, combines geologic statistical inversion with Poisson’s ratio inversion and makes quantitative description of the reservoir. Firstly, conduct petrophysical modeling and S?wave curve match using Xu White model; based on the seismic attribute analysis and spectral decomposition prediction of the thick sand distribution, by means of Monte Carlo statistical inversion, well describe four sets of thin sand layers of He?8 member of Shihezi formation of Permian in this gas field, and quantitatively describe the effective reservoir thickness, physical properties and spacial distribution by using elastic parameters prestack inversion and geo?modeling technologies.The case study shows that this quantitative characterization technology is effective with good effectiveness, providing technical support forits efficient development by horizontal well process Related Articles | Metrics

Petroleum Accumulation Pattern and Exploration Targets in HydrocarbonRich Sags of Melut Basin, Southern Sudan SHI Buqing1, LI Zhi2, XUE Liangqing1, YUAN Shengqiang2, SU Yongdi2, LI Zhangming1 2014, 35 (4):  1-1.  Abstract ( 95 )   PDF (300KB) ( 310 )   Save Melut basin is one of the passive rift basins in West and Central Africa. The discovery of the world?class giant Palogue oilfieldand followed exploration activities verified that the north Melut sub?basin (NMSB) of this basin is a hydrocarbon?rich sag. The Lower Cretaceous source rock is the major source rock of Melut basin, the Palaeogene is its main seal?reservoir assemblage and the Upper Cretaceous is its secondary reservoir?forming play and the main deep target for petroleum exploration. The mantle?origin CO2 invading into the NMSBfurther increased its enrichment of hydrocarbon accumulation. In recent years, Melut basin entered into the period of mature exploration,and there are less and less structural traps left. It is suggested that the lithologic traps of the Palaeogene target zone and the secondary reservoir-forming play of the Upper Cretaceous could be the main explorative targets in Melut basin in the future Related Articles | Metrics

Analysis of the Influencing Factors of Reserves Growth and the Potential of Halfayah Oilfield in Iraq BIAN Haiguang1, TIAN Zuoji1, TONG Xiaoguang2, WU Yiping1, PAN Xiaohua1 Analysis of the Influencing Factors of Reserves Growth and the Potential of Halfayah Oilfield in Iraq BIAN Haiguang1, TIAN Zuoji1, TONG Xiaoguang2, WU Yiping1, PAN Xiaohua1 2014, 35 (4):  1-1.  Abstract ( 115 )   PDF (300KB) ( 396 )   Save Reserve growth that is used to evaluate the incremental potential of recoverable reserves in discovered oil?gas fields is a major component of remaining oil and natural gas resources. According to the study of the influencing factors and growth potential of reserve growth in Halfayah oil field, it is found that the factors include geological factor, engineering factor and economic factor. The reserve growth of Halfayah oilfield in 2010—2012 is composed of the discovery of new pool (contributing 7%), the incremental OOIP (51%) and the incremental EOR (42%) in discovered reservoirs. And the extension of the field in the future could allow the reserve growth to be added about 7 956.5×104 t. According to the analogy analysis with Majnoon oilfield, it is believed that the recovery factor of Halfayah field will reach to 32%, and the reserve growth potential will add about 0.98×108 t Related Articles | Metrics

The Reservoir Characteristics of Antrim Shale Gas Play in Michigan Basin, USA LI Ming, WU Jie 2014, 35 (4):  1-1.  Abstract ( 74 )   PDF (300KB) ( 294 )   Save The Antrim shale gas play that is composed of such four sections as Norwood, Paxton, Lachine and Upper Member widely covers above the Middle?Lower Devonian in North America’s ancient continent, where the biogenic gas is mainly distributed in the shallow, under?compaction and organic?rich shale reservoirs and usually absorbed by the organic matter and clay. The Norwood and Lachine sections have the highest contents of organic matter as major zones for shale gas exploration in this area. This paper analyzes the source rock, thickness, physical property, mineral content, fracture system and its reservoir?forming role of this play, and then evaluates its explorative potentials.It is concluded that it is easy to generate biogas if the shale gas is deposited in deeper depth, then uplifted and suffered air and fresh water leaching, followed by forming the gas accumulation under suitable geological conditions. This study will be helpful for China’s shale gas exploration in the future Related Articles | Metrics